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212 lines
9.6 KiB
JavaScript
212 lines
9.6 KiB
JavaScript
/**
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* HTML5 placeholder polyfill
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* @requires jQuery - tested with 1.6.2 but might as well work with older versions
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*
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* code: https://github.com/ginader/HTML5-placeholder-polyfill
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* please report issues at: https://github.com/ginader/HTML5-placeholder-polyfill/issues
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*
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* Copyright (c) 2012 Dirk Ginader (ginader.de)
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* Dual licensed under the MIT and GPL licenses:
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* http://www.opensource.org/licenses/mit-license.php
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* http://www.gnu.org/licenses/gpl.html
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*
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* Version: 2.0.3
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*
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* History:
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* * 1.0 initial release
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* * 1.1 added support for multiline placeholders in textareas
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* * 1.2 Allow label to wrap the input element by noah https://github.com/ginader/HTML5-placeholder-polyfill/pull/1
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* * 1.3 New option to read placeholder to Screenreaders. Turned on by default
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* * 1.4 made placeholder more rubust to allow labels being offscreen + added minified version of the 3rd party libs
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* * 1.5 emptying the native placeholder to prevent double rendering in Browsers with partial support
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* * 1.6 optional reformat when a textarea is being resized - requires http://benalman.com/projects/jquery-resize-plugin/
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* * 1.7 feature detection is now included in the polyfill so you can simply include it without the need for Modernizr
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* * 1.8 replacing the HTML5 Boilerplate .visuallyhidden technique with one that still allows the placeholder to be rendered
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* * 1.8.1 bugfix for implicit labels
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* * 1.9 New option "hideOnFocus" which, if set to false will mimic the behavior of mobile safari and chrome (remove label when typed instead of onfocus)
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* * 1.9.1 added reformat event on window resize
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* * 1.9.2 more flexible way to "fix" labels that are hidden using clip() thanks to grahambates: https://github.com/ginader/HTML5-placeholder-polyfill/issues/12
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* * 2.0 new easier configuration technique and new options forceApply and AutoInit and support for setters and getters
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* * 2.0.1 changed check for empty field so a space character is no longer ignored
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* * 2.0.2 allow rerun of the placeholder() to cover generated elements - existing polyfilled placeholder will be repositioned. Fixing: https://github.com/ginader/HTML5-placeholder-polyfill/issues/15
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* * 2.0.3 turn debugging of for production. fix https://github.com/ginader/HTML5-placeholder-polyfill/issues/18
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*/
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(function($) {
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var debug = false,
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animId;
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function showPlaceholderIfEmpty(input,options) {
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if( input.val() === '' ){
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input.data('placeholder').removeClass(options.hideClass);
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}else{
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input.data('placeholder').addClass(options.hideClass);
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}
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}
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function hidePlaceholder(input,options){
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input.data('placeholder').addClass(options.hideClass);
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}
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function positionPlaceholder(placeholder,input){
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var ta = input.is('textarea');
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placeholder.css({
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width : input.innerWidth()-(ta ? 20 : 4),
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height : input.innerHeight()-6,
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lineHeight : input.css('line-height'),
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whiteSpace : ta ? 'normal' : 'nowrap',
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overflow : 'hidden'
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}).offset(input.offset());
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}
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function startFilledCheckChange(input,options){
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var input = input,
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val = input.val();
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(function checkloop(){
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animId = requestAnimationFrame(checkloop);
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if(input.val() != val){
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hidePlaceholder(input,options);
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stopCheckChange();
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startEmptiedCheckChange(input,options);
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}
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})();
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}
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function startEmptiedCheckChange(input,options){
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var input = input,
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val = input.val();
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(function checkloop(){
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animId = requestAnimationFrame(checkloop);
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showPlaceholderIfEmpty(input,options);
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})();
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}
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function stopCheckChange(){
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cancelAnimationFrame(animId);
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}
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function log(msg){
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if(debug && window.console && window.console.log){
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window.console.log(msg);
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}
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}
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$.fn.placeHolder = function(config) {
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log('init placeHolder');
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var o = this;
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var l = $(this).length;
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this.options = $.extend({
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className: 'placeholder', // css class that is used to style the placeholder
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visibleToScreenreaders : true, // expose the placeholder text to screenreaders or not
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visibleToScreenreadersHideClass : 'placeholder-hide-except-screenreader', // css class is used to visually hide the placeholder
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visibleToNoneHideClass : 'placeholder-hide', // css class used to hide the placeholder for all
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hideOnFocus : false, // either hide the placeholder on focus or on type
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removeLabelClass : 'visuallyhidden', // remove this class from a label (to fix hidden labels)
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hiddenOverrideClass : 'visuallyhidden-with-placeholder', // replace the label above with this class
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forceHiddenOverride : true, // allow the replace of the removeLabelClass with hiddenOverrideClass or not
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forceApply : false, // apply the polyfill even for browser with native support
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autoInit : true // init automatically or not
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}, config);
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this.options.hideClass = this.options.visibleToScreenreaders ? this.options.visibleToScreenreadersHideClass : this.options.visibleToNoneHideClass;
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return $(this).each(function(index) {
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var input = $(this),
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text = input.attr('placeholder'),
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id = input.attr('id'),
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label,placeholder,titleNeeded,polyfilled;
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label = input.closest('label');
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input.removeAttr('placeholder');
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if(!label.length && !id){
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log('the input element with the placeholder needs an id!');
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return;
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}
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label = label.length ? label : $('label[for="'+id+'"]').first();
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if(!label.length){
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log('the input element with the placeholder needs a label!');
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return;
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}
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polyfilled = $(label).find('.placeholder');
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if(polyfilled.length) {
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//log('the input element already has a polyfilled placeholder!');
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positionPlaceholder(polyfilled,input);
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return input;
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}
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if(label.hasClass(o.options.removeLabelClass)){
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label.removeClass(o.options.removeLabelClass)
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.addClass(o.options.hiddenOverrideClass);
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}
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placeholder = $('<span class="'+o.options.className+'">'+text+'</span>').appendTo(label);
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titleNeeded = (placeholder.width() > input.width());
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if(titleNeeded){
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placeholder.attr('title',text);
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}
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positionPlaceholder(placeholder,input);
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input.data('placeholder',placeholder);
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placeholder.data('input',placeholder);
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placeholder.click(function(){
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$(this).data('input').focus();
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});
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input.focusin(function() {
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if(!o.options.hideOnFocus && window.requestAnimationFrame){
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startFilledCheckChange(input,o.options);
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}else{
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hidePlaceholder(input,o.options);
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}
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});
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input.focusout(function(){
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showPlaceholderIfEmpty($(this),o.options);
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if(!o.options.hideOnFocus && window.cancelAnimationFrame){
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stopCheckChange();
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}
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});
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showPlaceholderIfEmpty(input,o.options);
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// reformat on window resize and optional reformat on font resize - requires: http://www.tomdeater.com/jquery/onfontresize/
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$(document).bind("fontresize resize", function(){
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positionPlaceholder(placeholder,input);
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});
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// optional reformat when a textarea is being resized - requires http://benalman.com/projects/jquery-resize-plugin/
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if($.event.special.resize){
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$("textarea").bind("resize", function(e){
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positionPlaceholder(placeholder,input);
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});
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}else{
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// we simply disable the resizeablilty of textareas when we can't react on them resizing
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$("textarea").css('resize','none');
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}
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if(index >= l-1){
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$.attrHooks.placeholder = {
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get: function(elem) {
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if (elem.nodeName.toLowerCase() == 'input' || elem.nodeName.toLowerCase() == 'textarea') {
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if( $(elem).data('placeholder') ){
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// has been polyfilled
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return $( $(elem).data('placeholder') ).text();
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}else{
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// native / not yet polyfilled
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return $(elem)[0].placeholder;
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}
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}else{
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return undefined;
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}
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},
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set: function(elem, value){
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return $( $(elem).data('placeholder') ).text(value);
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}
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};
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}
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});
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};
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$(function(){
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var config = window.placeHolderConfig || {};
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if(config.autoInit === false){
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log('placeholder:abort because autoInit is off');
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return
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}
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if('placeholder' in $('<input>')[0] && !config.forceApply){ // don't run the polyfill when the browser has native support
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log('placeholder:abort because browser has native support');
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return;
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}
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$('input[placeholder], textarea[placeholder]').placeHolder(config);
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});
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})(jQuery); |