Trigger resize event with jQuery cross-browser

Bind an event handler to the "resize" JavaScript event, or trigger that event on an element

jQuery has a built-in method for this:

$(window).resize(function () { /* do something */ }); 

For the sake of UI responsiveness, you might consider using a setTimeout to call your code only after some number of milliseconds, as shown in the following example, inspired by this:

function doSomething() { 
    alert("I'm done resizing for the moment"); 
}; 
 
var resizeTimer; 
$(window).resize(function() { 
    clearTimeout(resizeTimer); 
    resizeTimer = setTimeout(doSomething, 100); 
}); 

Add jQuery library to a webpart via code

How to load your jQuery library at the same time as your webpart?

Add the jQuery library reference via code to your webpart.

protected override void Render(HtmlTextWriter writer)
{

 writer.AddAttribute(HtmlTextWriterAttribute.Src, "/_layouts/1043/STYLES/myUZA/js/jquery-1.4.2.min.js");
 writer.AddAttribute(HtmlTextWriterAttribute.Type, "text/javascript");
 writer.RenderBeginTag(HtmlTextWriterTag.Script);
 writer.RenderEndTag();

}

Another option is to do it in a full javascript block. You write the javascript code, put it in a string and register the javascript block via C# code:

//Load the jQuery library if it's not yet loaded

string js = @"<script type=""text/javascript"">

<">if (typeof jQuery == 'undefined') {
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = '/_layouts/1043/STYLES/myUZA/js/jquery-1.4.2.min.js';
document.getElementsByTagName('head')[0].appendChild(script);
}
</script>";

/// Register the javascript block
if (!Page.ClientScript.IsClientScriptBlockRegistered(jsKey))

{

this.Page.ClientScript.RegisterClientScriptBlock(GetType(), "jQueryLib", js, false);

}