100 lines
5.0 KiB
JavaScript
100 lines
5.0 KiB
JavaScript
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/* -*- coding: utf-8 -*- vim:sw=4:sts=4:et:ai:si:sta:fenc=utf-8
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*/
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;(function($){
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//pass in just the context as a $(obj) or a settings JS object
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$.fn.autogrow = function(opts) {
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var that = $(this).css({overflow: 'hidden', resize: 'none'}) //prevent scrollies
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, selector = that.selector
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, defaults = {
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context: $(document) //what to wire events to
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, animate: false //if you want the size change to animate
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, speed: 200 //speed of animation
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, fixMinHeight: true //if you don't want the box to shrink below its initial size
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, cloneClass: 'autogrowclone' //helper CSS class for clone if you need to add special rules
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, onInitialize: true //resizes the textareas when the plugin is initialized
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}
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;
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opts = $.isPlainObject(opts) ? opts : {context: opts ? opts : $(document)};
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opts = $.extend({}, defaults, opts);
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that.each(function(i, elem){
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var min, clone;
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elem = $(elem);
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//if the element is "invisible", we get an incorrect height value
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//to get correct value, clone and append to the body.
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if (elem.is(':visible') || parseInt(elem.css('height'), 10) > 0) {
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min = parseInt(elem.css('height'), 10) || elem.innerHeight();
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} else {
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clone = elem.clone()
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.addClass(opts.cloneClass)
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.val(elem.val())
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.css({
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position: 'absolute'
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, visibility: 'hidden'
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, display: 'block'
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})
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;
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$('body').append(clone);
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min = clone.innerHeight();
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clone.remove();
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}
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if (opts.fixMinHeight) {
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elem.data('autogrow-start-height', min); //set min height
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}
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elem.css('height', min);
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//if (opts.onInitialize) {
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// resize.call(elem);
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//}
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});
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opts.context
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.on('keyup paste', selector, resize)
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;
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// Le code ci-dessus ne semble pas fonctionner. C'est la raison pour
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// laquelle l'événement est provoqué ici. Le problème potentiel est
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// que l'événement remonte toute la chaine DOM jusqu'au document.
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if (opts.onInitialize) that.trigger('keyup');
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function resize (e){
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var box = $(this)
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, oldHeight = box.innerHeight()
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, newHeight = this.scrollHeight
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, minHeight = box.data('autogrow-start-height') || 0
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, clone
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;
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if (oldHeight < newHeight) { //user is typing
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this.scrollTop = 0; //try to reduce the top of the content hiding for a second
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opts.animate ? box.stop().animate({height: newHeight}, opts.speed) : box.innerHeight(newHeight);
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} else if (!e || e.which === 8 || e.which === 46 || (e.ctrlKey && e.which === 88)) { //user is deleting, backspacing, or cutting
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if (oldHeight > minHeight) { //shrink!
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//this cloning part is not particularly necessary. however, it helps with animation
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//since the only way to cleanly calculate where to shrink the box to is to incrementally
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//reduce the height of the box until the $.innerHeight() and the scrollHeight differ.
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//doing this on an exact clone to figure out the height first and then applying it to the
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//actual box makes it look cleaner to the user
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clone = box.clone()
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.addClass(opts.cloneClass) //add clone class for extra css rules
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.css({position: 'absolute', zIndex:-10}) //make "invisible"
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.val(box.val()) //populate with content for consistent measuring
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;
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box.after(clone); //append as close to the box as possible for best CSS matching for clone
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do { //reduce height until they don't match
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newHeight = clone[0].scrollHeight - 1;
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clone.innerHeight(newHeight);
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} while (newHeight === clone[0].scrollHeight);
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newHeight++; //adding one back eliminates a wiggle on deletion
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clone.remove();
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box.focus(); // Fix issue with Chrome losing focus from the textarea.
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//if user selects all and deletes or holds down delete til beginning
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//user could get here and shrink whole box
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newHeight < minHeight && (newHeight = minHeight);
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oldHeight > newHeight && opts.animate ? box.stop().animate({height: newHeight}, opts.speed) : box.innerHeight(newHeight);
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} else { //just set to the minHeight
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box.innerHeight(minHeight);
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}
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}
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}
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return that;
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}
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})(jQuery);
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