我不知道标题是否正确。我用一个脚本创建了一个带有 5 个 textarea 且 class="expand" 的表。我写作时这个文本区域会扩展但随后不起作用。有没有写完后调用jquery插件的方法？在我尝试不创建 textarea 之前，我在 html 文件中编写了它并且它有效。
（关于 2 textarea 的信息和示例：
http://blogs.sitepointstatic.com/examples/tech/textarea-expander/index.html
http://jsfiddle.net/V2RLs/2/ (without class="expand")
) 但是当我在 textarea 中写入后它不会扩展。为什么？
这是我的脚本：
<script src='js/jquery.textarea-expander.js'></script>
<script >$(document).ready(function() {
var regex,v,l,c,b;
$( "#wnd_Addparam" ).dialog({
autoOpen: false,
height: 'auto',
width: 350,
modal: true,
resizable:false,
buttons: {
"Add": function() {
contapara=(parseInt(contapara)+1);
document.getElementById("sorpara").innerHTML+="<li id=\"inputp"+contapara+"_id\" class=\"ui-state-default\"><span class=\"ui-icon ui-icon-arrowthick-2-n-s\"></span>"+txt_idparam.value+"</li>";
$('#formp').submit();
$( this ).dialog( "close" );
},
Cancel: function() {
$( this ).dialog( "close" );
}
},
close: function() {
$( this ).dialog( "close" );
}
});
$( "#btn_Addpar" ).click(function() {
i=(parseInt(contapara)+1);
$('#wnd_Addparam').append('<form method="GET" id="formparam"><table><tr><td><label> ID </label></td><td><textarea class="expand" id="inputp'+i+'_id" class="text"> </textarea></td></tr><tr><td><label>Type</label></td><td><select id="inputp'+i+'_type"><option value="text">Text</option><option value="integer">Integer</option><option value="float">Float</option><option value="list_values">List of values</option><option value="range">Range</option><option value="selection_collapsed">Selection (collapsed)</option><option value="selection_expanded">Selection (expanded)</option><option value="subimage">Subimage selection</option><option value="polygon">Polygon selection</option><option value="horizontal_separator">Horizontal separator</option></select></td></tr><tr><td> <label > Description</label></td> <td><textarea class="expand" id="inputp'+i+'_description" size=24></textarea></td></tr><tr><td><label>Value</label></td><td><textarea class="expand" id="inputp'+i+'_value"></textarea></td></tr><tr><td><label>Info (help)</label></td><td><textarea class="expand" id="inputp'+i+'_info"></textarea></td></tr><tr><td><label> Visible?</label></td><td><input type="checkbox" id="inputp'+i+'_visible"></td></tr></table>/form>');
$( "#wnd_Addparam" ).dialog( "open" );
});});</script>
插件扩展器..
/**
* TextAreaExpander plugin for jQuery
* v1.0
* Expands or contracts a textarea height depending on the
* quatity of content entered by the user in the box.
*
* By Craig Buckler, Optimalworks.net
*
* As featured on SitePoint.com:
* http://www.sitepoint.com/blogs/2009/07/29/build-auto-expanding-textarea-1/
*
* Please use as you wish at your own risk.
*/
/**
* Usage:
*
* From JavaScript, use:
* $(<node>).TextAreaExpander(<minHeight>, <maxHeight>);
* where:
* <node> is the DOM node selector, e.g. "textarea"
* <minHeight> is the minimum textarea height in pixels (optional)
* <maxHeight> is the maximum textarea height in pixels (optional)
*
* Alternatively, in you HTML:
* Assign a class of "expand" to any <textarea> tag.
* e.g. <textarea name="textarea1" rows="3" cols="40" class="expand"></textarea>
*
* Or assign a class of "expandMIN-MAX" to set the <textarea> minimum and maximum height.
* e.g. <textarea name="textarea1" rows="3" cols="40" class="expand50-200"></textarea>
* The textarea will use an appropriate height between 50 and 200 pixels.
*/
(function($) {
// jQuery plugin definition
$.fn.TextAreaExpander = function(minHeight, maxHeight) {
var hCheck = !($.browser.msie || $.browser.opera);
// resize a textarea
function ResizeTextarea(e) {
// event or initialize element?
e = e.target || e;
// find content length and box width
var vlen = e.value.length, ewidth = e.offsetWidth;
if (vlen != e.valLength || ewidth != e.boxWidth) {
if (hCheck && (vlen < e.valLength || ewidth != e.boxWidth)) e.style.height = "0px";
var h = Math.max(e.expandMin, Math.min(e.scrollHeight, e.expandMax))+2;
e.style.overflow = (e.scrollHeight > h ? "auto" : "hidden");
e.style.height = h + "px";
e.valLength = vlen;
e.boxWidth = ewidth;
}
return true;
};
// initialize
this.each(function() {
// is a textarea?
if (this.nodeName.toLowerCase() != "textarea") return;
// set height restrictions
var p = this.className.match(/expand(\d+)\-*(\d+)*/i);
this.expandMin = minHeight || (p ? parseInt('0'+p[1], 10) : 0);
this.expandMax = maxHeight || (p ? parseInt('0'+p[2], 10) : 99999);
// initial resize
ResizeTextarea(this);
// zero vertical padding and add events
if (!this.Initialized) {
this.Initialized = true;
$(this).css("padding-top", 0).css("padding-bottom", 0);
$(this).bind("keyup", ResizeTextarea).bind("focus", ResizeTextarea);
}
});
return this;
};
})(jQuery);
// initialize all expanding textareas
jQuery(document).ready(function() {
jQuery("textarea[class*=expand]").TextAreaExpander();
});