Question

I don’t know if the title is correct.
I created, with one script, a table with 5 textarea with class=”expand”.
This textarea when I write expands but then doesn’t works.
Is there a method after writing to call the jquery plugin?
Before i tried without creating the textarea, I wrote in the html file and it worked.

(Info and example on 2 textarea:

http://blogs.sitepointstatic.com/examples/tech/textarea-expander/index.html
http://jsfiddle.net/V2RLs/2/ (without class="expand")

)
But after When i write in the textarea it doesn’t expands.Why?

This is my script:

<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>

The plugin expander..

/**
* 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();
});

Answer 1

The plugin prepares textareas on document.ready, so any textarea that this class is assigned to after document.ready fired will not be affected by the plugin – however, you can just call the plugin directly instead of adding the class:

jQuery(".expand").TextAreaExpander();

However, you should not run TextAreaExpander twice on one element, so be sure to use another classname for the newly generated textareas if you have textareas using the plugin that are initialized on document.ready – alternatively you can delete the last few lines of the plugin.