Why does my jqueryui modal form close when I execute this code?

When I execute this code, my jquer开发者_JAVA技巧yui modal form closes. Why does it do this?

$(document).ready(function() { $('#mylink').click(function(){ $('#textfield').val = ''; }); });

mylink is defined like this:

<a href"" id="mylink">My Link</a>

Try $('#textfield).val('');

That's normally how you set the value.

you need to return false in the click function to prevent the page from posting back