There are three way to change the URL for a Hyperlink using jQuery.

1-   $("a").attr("href", "http://www.phpinterviewquestion.com/");

2-   $("a[href='http://www.phpinterviewquestion.com/']")
     .attr('href', 'http://phpinterviewquestion.com/');
3-  $("a[href^='http://phpinterviewquestion.com']").each(function()  {
      this.href = this.href.replace(/^http:\/\/beta\.phpinterviewquestion\.com/,
         "http://phpinterviewquestion.com");
   });

There  are different methods to check and uncheck the check boxes.

suppose that you have checkboxes like that

<input type=”checkbox”  value=”1″ name=”Items”  id=”Items1″ />
<input type=”checkbox”  value=”2″ name=”Items”  id=”Items2″ />
<input type=”checkbox”  value=”3″ name=”Items”  id=”Items3″ />
<input type=”checkbox”  value=”1″ name=”Items”  id=”Items4″ />

1- using attr() function.
$(‘#checkall’).click(function(){
$(”input[@name='Items']:checked”).attr(’checked’,true);
});
$(‘#uncheckall’).click(function(){
$(”input[@name='Items']:checked”).attr(’checked’,false);});

2- using attr() and removeAttr()funstions
$(‘#checkall’).click(function(){
$(”input[@name='Items']:checked”).attr(’checked’,true);
});
$(‘#uncheckall’).click(function(){
$(”input[@name='Items']:checked”).removeAttr(’checked’);});

Note- if your checkbox name is array type, then simple replace Items to Items[]

using css() method we can apply css in div element.
example:
$(”div”).css(”border”,”1px solid green”);

Using two function, we can perform the operation.

// Check #x
$(”#checkboxid”).attr(”checked”, “checked”);
// Uncheck #x
$(”#checkboxid”).removeAttr(”checked”);

Example

I’ll be checked/unchecked.