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+/*
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+ * The MIT License
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+ *
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+ * Copyright (c) 2012 James Allardice
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"),
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+ * to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
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+ * and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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+ * THE SOFTWARE.
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+ */
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+
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+// Defines the global Placeholders object along with various utility methods
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+(function (global) {
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+
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+ "use strict";
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+
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+ // Cross-browser DOM event binding
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+ function addEventListener(elem, event, fn) {
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+ if (elem.addEventListener) {
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+ return elem.addEventListener(event, fn, false);
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+ }
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+ if (elem.attachEvent) {
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+ return elem.attachEvent("on" + event, fn);
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+ }
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+ }
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+
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+ // Check whether an item is in an array (we don't use Array.prototype.indexOf so we don't clobber any existing polyfills - this is a really simple alternative)
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+ function inArray(arr, item) {
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+ var i, len;
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+ for (i = 0, len = arr.length; i < len; i++) {
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+ if (arr[i] === item) {
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+ return true;
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+ }
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+ }
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+ return false;
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+ }
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+
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+ // Move the caret to the index position specified. Assumes that the element has focus
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+ function moveCaret(elem, index) {
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+ var range;
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+ if (elem.createTextRange) {
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+ range = elem.createTextRange();
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+ range.move("character", index);
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+ range.select();
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+ } else if (elem.selectionStart) {
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+ elem.focus();
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+ elem.setSelectionRange(index, index);
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+ }
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+ }
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+
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+ // Attempt to change the type property of an input element
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+ function changeType(elem, type) {
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+ try {
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+ elem.type = type;
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+ return true;
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+ } catch (e) {
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+ // You can't change input type in IE8 and below
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+ return false;
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+ }
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+ }
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+
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+ // Expose public methods
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+ global.Placeholders = {
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+ Utils: {
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+ addEventListener: addEventListener,
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+ inArray: inArray,
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+ moveCaret: moveCaret,
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+ changeType: changeType
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+ }
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+ };
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+
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+}(this));
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+
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+(function (global) {
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+
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+ "use strict";
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+
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+ var validTypes = [
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+ "text",
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+ "search",
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+ "url",
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+ "tel",
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+ "email",
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+ "password",
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+ "number",
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+ "textarea"
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+ ],
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+
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+ // The list of keycodes that are not allowed when the polyfill is configured to hide-on-input
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+ badKeys = [
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+
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+ // The following keys all cause the caret to jump to the end of the input value
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+ 27, // Escape
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+ 33, // Page up
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+ 34, // Page down
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+ 35, // End
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+ 36, // Home
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+
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+ // Arrow keys allow you to move the caret manually, which should be prevented when the placeholder is visible
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+ 37, // Left
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+ 38, // Up
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+ 39, // Right
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+ 40, // Down
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+
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+ // The following keys allow you to modify the placeholder text by removing characters, which should be prevented when the placeholder is visible
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+ 8, // Backspace
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+ 46 // Delete
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+ ],
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+
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+ // Styling variables
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+ placeholderStyleColor = "#ccc",
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+ placeholderClassName = "placeholdersjs",
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+ classNameRegExp = new RegExp("(?:^|\\s)" + placeholderClassName + "(?!\\S)"),
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+
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+ // These will hold references to all elements that can be affected. NodeList objects are live, so we only need to get those references once
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+ inputs, textareas,
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+
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+ // The various data-* attributes used by the polyfill
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+ ATTR_CURRENT_VAL = "data-placeholder-value",
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+ ATTR_ACTIVE = "data-placeholder-active",
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+ ATTR_INPUT_TYPE = "data-placeholder-type",
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+ ATTR_FORM_HANDLED = "data-placeholder-submit",
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+ ATTR_EVENTS_BOUND = "data-placeholder-bound",
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+ ATTR_OPTION_FOCUS = "data-placeholder-focus",
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+ ATTR_OPTION_LIVE = "data-placeholder-live",
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+ ATTR_MAXLENGTH = "data-placeholder-maxlength",
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+
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+ // Various other variables used throughout the rest of the script
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+ test = document.createElement("input"),
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+ head = document.getElementsByTagName("head")[0],
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+ root = document.documentElement,
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+ Placeholders = global.Placeholders,
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+ Utils = Placeholders.Utils,
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+ hideOnInput, liveUpdates, keydownVal, styleElem, styleRules, placeholder, timer, form, elem, len, i;
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+
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+ // No-op (used in place of public methods when native support is detected)
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+ function noop() {}
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+
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+ // Avoid IE9 activeElement of death when an iframe is used.
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+ // More info:
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+ // http://bugs.jquery.com/ticket/13393
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+ // https://github.com/jquery/jquery/commit/85fc5878b3c6af73f42d61eedf73013e7faae408
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+ function safeActiveElement() {
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+ try {
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+ return document.activeElement;
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+ } catch (err) {}
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+ }
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+
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+ // Hide the placeholder value on a single element. Returns true if the placeholder was hidden and false if it was not (because it wasn't visible in the first place)
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+ function hidePlaceholder(elem, keydownValue) {
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+ var type,
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+ maxLength,
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+ valueChanged = (!!keydownValue && elem.value !== keydownValue),
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+ isPlaceholderValue = (elem.value === elem.getAttribute(ATTR_CURRENT_VAL));
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+
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+ if ((valueChanged || isPlaceholderValue) && elem.getAttribute(ATTR_ACTIVE) === "true") {
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+ elem.removeAttribute(ATTR_ACTIVE);
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+ elem.value = elem.value.replace(elem.getAttribute(ATTR_CURRENT_VAL), "");
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+ elem.className = elem.className.replace(classNameRegExp, "");
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+
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+ // Restore the maxlength value
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+ maxLength = elem.getAttribute(ATTR_MAXLENGTH);
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+ if (parseInt(maxLength, 10) >= 0) { // Old FF returns -1 if attribute not set (see GH-56)
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+ elem.setAttribute("maxLength", maxLength);
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+ elem.removeAttribute(ATTR_MAXLENGTH);
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+ }
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+
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+ // If the polyfill has changed the type of the element we need to change it back
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+ type = elem.getAttribute(ATTR_INPUT_TYPE);
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+ if (type) {
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+ elem.type = type;
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+ }
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+ return true;
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+ }
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+ return false;
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+ }
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+
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+ // Show the placeholder value on a single element. Returns true if the placeholder was shown and false if it was not (because it was already visible)
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+ function showPlaceholder(elem) {
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+ var type,
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+ maxLength,
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+ val = elem.getAttribute(ATTR_CURRENT_VAL);
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+ if (elem.value === "" && val) {
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+ elem.setAttribute(ATTR_ACTIVE, "true");
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+ elem.value = val;
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+ elem.className += " " + placeholderClassName;
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+
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+ // Store and remove the maxlength value
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+ maxLength = elem.getAttribute(ATTR_MAXLENGTH);
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+ if (!maxLength) {
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+ elem.setAttribute(ATTR_MAXLENGTH, elem.maxLength);
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+ elem.removeAttribute("maxLength");
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+ }
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+
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+ // If the type of element needs to change, change it (e.g. password inputs)
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+ type = elem.getAttribute(ATTR_INPUT_TYPE);
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+ if (type) {
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+ elem.type = "text";
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+ } else if (elem.type === "password") {
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+ if (Utils.changeType(elem, "text")) {
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+ elem.setAttribute(ATTR_INPUT_TYPE, "password");
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+ }
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+ }
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+ return true;
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+ }
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+ return false;
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+ }
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+
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+ function handleElem(node, callback) {
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+
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+ var handleInputsLength, handleTextareasLength, handleInputs, handleTextareas, elem, len, i;
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+
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+ // Check if the passed in node is an input/textarea (in which case it can't have any affected descendants)
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+ if (node && node.getAttribute(ATTR_CURRENT_VAL)) {
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+ callback(node);
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+ } else {
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+
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+ // If an element was passed in, get all affected descendants. Otherwise, get all affected elements in document
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+ handleInputs = node ? node.getElementsByTagName("input") : inputs;
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+ handleTextareas = node ? node.getElementsByTagName("textarea") : textareas;
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+
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+ handleInputsLength = handleInputs ? handleInputs.length : 0;
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+ handleTextareasLength = handleTextareas ? handleTextareas.length : 0;
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+
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+ // Run the callback for each element
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+ for (i = 0, len = handleInputsLength + handleTextareasLength; i < len; i++) {
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+ elem = i < handleInputsLength ? handleInputs[i] : handleTextareas[i - handleInputsLength];
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+ callback(elem);
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+ }
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+ }
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+ }
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+
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+ // Return all affected elements to their normal state (remove placeholder value if present)
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+ function disablePlaceholders(node) {
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+ handleElem(node, hidePlaceholder);
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+ }
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+
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+ // Show the placeholder value on all appropriate elements
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+ function enablePlaceholders(node) {
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+ handleElem(node, showPlaceholder);
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+ }
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+
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+ // Returns a function that is used as a focus event handler
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+ function makeFocusHandler(elem) {
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+ return function () {
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+
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+ // Only hide the placeholder value if the (default) hide-on-focus behaviour is enabled
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+ if (hideOnInput && elem.value === elem.getAttribute(ATTR_CURRENT_VAL) && elem.getAttribute(ATTR_ACTIVE) === "true") {
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+
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+ // Move the caret to the start of the input (this mimics the behaviour of all browsers that do not hide the placeholder on focus)
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+ Utils.moveCaret(elem, 0);
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+
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+ } else {
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+
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+ // Remove the placeholder
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+ hidePlaceholder(elem);
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+ }
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+ };
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+ }
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+
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+ // Returns a function that is used as a blur event handler
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+ function makeBlurHandler(elem) {
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+ return function () {
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+ showPlaceholder(elem);
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+ };
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+ }
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+
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+ // Functions that are used as a event handlers when the hide-on-input behaviour has been activated - very basic implementation of the "input" event
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+ function makeKeydownHandler(elem) {
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+ return function (e) {
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+ keydownVal = elem.value;
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+
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+ //Prevent the use of the arrow keys (try to keep the cursor before the placeholder)
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+ if (elem.getAttribute(ATTR_ACTIVE) === "true") {
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+ if (keydownVal === elem.getAttribute(ATTR_CURRENT_VAL) && Utils.inArray(badKeys, e.keyCode)) {
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+ if (e.preventDefault) {
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+ e.preventDefault();
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+ }
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+ return false;
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+ }
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+ }
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+ };
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+ }
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+ function makeKeyupHandler(elem) {
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+ return function () {
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+ hidePlaceholder(elem, keydownVal);
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+
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+ // If the element is now empty we need to show the placeholder
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+ if (elem.value === "") {
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+ elem.blur();
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+ Utils.moveCaret(elem, 0);
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+ }
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+ };
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+ }
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+ function makeClickHandler(elem) {
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+ return function () {
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+ if (elem === safeActiveElement() && elem.value === elem.getAttribute(ATTR_CURRENT_VAL) && elem.getAttribute(ATTR_ACTIVE) === "true") {
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+ Utils.moveCaret(elem, 0);
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+ }
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+ };
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+ }
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+
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+ // Returns a function that is used as a submit event handler on form elements that have children affected by this polyfill
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+ function makeSubmitHandler(form) {
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+ return function () {
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+
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+ // Turn off placeholders on all appropriate descendant elements
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+ disablePlaceholders(form);
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+ };
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+ }
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+
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+ // Bind event handlers to an element that we need to affect with the polyfill
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+ function newElement(elem) {
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+
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+ // If the element is part of a form, make sure the placeholder string is not submitted as a value
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+ if (elem.form) {
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+ form = elem.form;
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+
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+ // If the type of the property is a string then we have a "form" attribute and need to get the real form
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+ if (typeof form === "string") {
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+ form = document.getElementById(form);
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+ }
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+
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+ // Set a flag on the form so we know it's been handled (forms can contain multiple inputs)
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+ if (!form.getAttribute(ATTR_FORM_HANDLED)) {
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+ Utils.addEventListener(form, "submit", makeSubmitHandler(form));
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+ form.setAttribute(ATTR_FORM_HANDLED, "true");
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+ }
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+ }
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+
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+ // Bind event handlers to the element so we can hide/show the placeholder as appropriate
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+ Utils.addEventListener(elem, "focus", makeFocusHandler(elem));
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+ Utils.addEventListener(elem, "blur", makeBlurHandler(elem));
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+
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+ // If the placeholder should hide on input rather than on focus we need additional event handlers
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+ if (hideOnInput) {
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+ Utils.addEventListener(elem, "keydown", makeKeydownHandler(elem));
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+ Utils.addEventListener(elem, "keyup", makeKeyupHandler(elem));
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+ Utils.addEventListener(elem, "click", makeClickHandler(elem));
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+ }
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+
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+ // Remember that we've bound event handlers to this element
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+ elem.setAttribute(ATTR_EVENTS_BOUND, "true");
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+ elem.setAttribute(ATTR_CURRENT_VAL, placeholder);
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+
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+ // If the element doesn't have a value and is not focussed, set it to the placeholder string
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+ if (hideOnInput || elem !== safeActiveElement()) {
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+ showPlaceholder(elem);
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+ }
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+ }
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+
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+ Placeholders.nativeSupport = test.placeholder !== void 0;
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+
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+ if (!Placeholders.nativeSupport) {
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+
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+ // Get references to all the input and textarea elements currently in the DOM (live NodeList objects to we only need to do this once)
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+ inputs = document.getElementsByTagName("input");
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+ textareas = document.getElementsByTagName("textarea");
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+
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+ // Get any settings declared as data-* attributes on the root element (currently the only options are whether to hide the placeholder on focus or input and whether to auto-update)
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+ hideOnInput = root.getAttribute(ATTR_OPTION_FOCUS) === "false";
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+ liveUpdates = root.getAttribute(ATTR_OPTION_LIVE) !== "false";
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+
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+ // Create style element for placeholder styles (instead of directly setting style properties on elements - allows for better flexibility alongside user-defined styles)
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+ styleElem = document.createElement("style");
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+ styleElem.type = "text/css";
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+
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+ // Create style rules as text node
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+ styleRules = document.createTextNode("." + placeholderClassName + " { color:" + placeholderStyleColor + "; }");
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+
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+ // Append style rules to newly created stylesheet
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+ if (styleElem.styleSheet) {
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+ styleElem.styleSheet.cssText = styleRules.nodeValue;
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+ } else {
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+ styleElem.appendChild(styleRules);
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+ }
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+
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+ // Prepend new style element to the head (before any existing stylesheets, so user-defined rules take precedence)
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+ head.insertBefore(styleElem, head.firstChild);
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+
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+ // Set up the placeholders
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+ for (i = 0, len = inputs.length + textareas.length; i < len; i++) {
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+ elem = i < inputs.length ? inputs[i] : textareas[i - inputs.length];
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+
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+ // Get the value of the placeholder attribute, if any. IE10 emulating IE7 fails with getAttribute, hence the use of the attributes node
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+ placeholder = elem.attributes.placeholder;
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+ if (placeholder) {
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+
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+ // IE returns an empty object instead of undefined if the attribute is not present
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+ placeholder = placeholder.nodeValue;
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+
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+ // Only apply the polyfill if this element is of a type that supports placeholders, and has a placeholder attribute with a non-empty value
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+ if (placeholder && Utils.inArray(validTypes, elem.type)) {
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+ newElement(elem);
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+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // If enabled, the polyfill will repeatedly check for changed/added elements and apply to those as well
|
|
|
+ timer = setInterval(function () {
|
|
|
+ for (i = 0, len = inputs.length + textareas.length; i < len; i++) {
|
|
|
+ elem = i < inputs.length ? inputs[i] : textareas[i - inputs.length];
|
|
|
+
|
|
|
+ // Only apply the polyfill if this element is of a type that supports placeholders, and has a placeholder attribute with a non-empty value
|
|
|
+ placeholder = elem.attributes.placeholder;
|
|
|
+ if (placeholder) {
|
|
|
+ placeholder = placeholder.nodeValue;
|
|
|
+ if (placeholder && Utils.inArray(validTypes, elem.type)) {
|
|
|
+
|
|
|
+ // If the element hasn't had event handlers bound to it then add them
|
|
|
+ if (!elem.getAttribute(ATTR_EVENTS_BOUND)) {
|
|
|
+ newElement(elem);
|
|
|
+ }
|
|
|
+
|
|
|
+ // If the placeholder value has changed or not been initialised yet we need to update the display
|
|
|
+ if (placeholder !== elem.getAttribute(ATTR_CURRENT_VAL) || (elem.type === "password" && !elem.getAttribute(ATTR_INPUT_TYPE))) {
|
|
|
+
|
|
|
+ // Attempt to change the type of password inputs (fails in IE < 9)
|
|
|
+ if (elem.type === "password" && !elem.getAttribute(ATTR_INPUT_TYPE) && Utils.changeType(elem, "text")) {
|
|
|
+ elem.setAttribute(ATTR_INPUT_TYPE, "password");
|
|
|
+ }
|
|
|
+
|
|
|
+ // If the placeholder value has changed and the placeholder is currently on display we need to change it
|
|
|
+ if (elem.value === elem.getAttribute(ATTR_CURRENT_VAL)) {
|
|
|
+ elem.value = placeholder;
|
|
|
+ }
|
|
|
+
|
|
|
+ // Keep a reference to the current placeholder value in case it changes via another script
|
|
|
+ elem.setAttribute(ATTR_CURRENT_VAL, placeholder);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ } else if (elem.getAttribute(ATTR_ACTIVE)) {
|
|
|
+ hidePlaceholder(elem);
|
|
|
+ elem.removeAttribute(ATTR_CURRENT_VAL);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // If live updates are not enabled cancel the timer
|
|
|
+ if (!liveUpdates) {
|
|
|
+ clearInterval(timer);
|
|
|
+ }
|
|
|
+ }, 100);
|
|
|
+ }
|
|
|
+
|
|
|
+ Utils.addEventListener(global, "beforeunload", function () {
|
|
|
+ Placeholders.disable();
|
|
|
+ });
|
|
|
+
|
|
|
+ // Expose public methods
|
|
|
+ Placeholders.disable = Placeholders.nativeSupport ? noop : disablePlaceholders;
|
|
|
+ Placeholders.enable = Placeholders.nativeSupport ? noop : enablePlaceholders;
|
|
|
+
|
|
|
+}(this));
|