How to check if jQuery library and plugin is loaded?

jQuery library

To check if jQuery library is loaded, use the following JavaScript code :
Method 1:

Method 2:

jQuery Plugin

Here is how to check if some jQuery plugin is loaded or not:

For example, let’s assume that my plugin depends on jQuery Validation plugin. To check if validation plugin is loaded I would do the following:

Example of JQuery UI Dialog With Dynamically Loading an URL with an IFRAME

The jQuery UI dialog is easy to get started with but has a few areas that causes new users some trouble. One of the most commonly asked questions on the jquery-ui list is “how to load iframe (other webpage) in dialog?” In this article I’ll explain how to load Dynamically URL with an IFRAME in Query UI Dialog.



First, we create link to page which we want to open into dialog.

<a id="pop" href="" title="Ashish Blog" >AshishBlog</a>

Now, we create dialog on link’s click event and get link href and title to diaplay in dialog.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>jQuery UI Dialog Demo - Ashish's Blog</title>
<script type="text/javascript" src=""></script>
    <script type="text/javascript" src=""></script>
    <link type="text/css" rel="Stylesheet" href="">
    <script type="text/javascript">
        $(document).ready(function () {
            $('a#pop').live('click', function (e) {
                var page = $(this).attr("href")
                var pagetitle = $(this).attr("title")
                var $dialog = $('<div></div>')
                .html('<iframe style="border: 0px; " src="' + page + '" width="100%" height="100%"></iframe>')
                    autoOpen: false,
                    modal: true,
                    height: 625,
                    width: 500,
                    title: pagetitle
     <a id="pop" href="" title="Ashish Blog">AshishBlog</a>


Textbox Watermark without jQuery

What is TextBoxWatermark?
When a TextBox is empty, it displays a message to the user. Once the user has typed some text into the TextBox, the watermarked appearance goes away. The typical purpose of a watermark is to provide more information to the user about the TextBox itself without cluttering up the rest of the page.

However, TextBoxWatermark can be done in CSS by using :focus pseudo-class but note that :focus is not supported by IE. And also done by using jQuery plugin.

Here is simple way to do TextBoxWatermark by using HTML Event handler attributes such as OnFocus and OnBlur.