Adding attribute in jQuery

You can add attributes using attr like so:

$('#someid').attr('name', 'value');

However, for DOM properties like checked, disabled and readonly, the proper way to do this (as of JQuery 1.6) is to use prop.

$('#someid').prop('disabled', true);

You can do this with jQuery's .attr function, which will set attributes. Removing them is done via the .removeAttr function.

//.attr()
$("element").attr("id", "newId");
$("element").attr("disabled", true);

//.removeAttr()
$("element").removeAttr("id");
$("element").removeAttr("disabled");

best solution: from jQuery v1.6 you can use prop() to add a property

$('#someid').prop('disabled', true);

to remove it, use removeProp()

$('#someid').removeProp('disabled');

Reference

Also note that the .removeProp() method should not be used to set these properties to false. Once a native property is removed, it cannot be added again. See .removeProp() for more information.