JQuery issues with SharePoint

I am having a strange problem with jQuery inside sharepoint. My jQuery code works fine in Web Applications but when I use the same code on a Web Part it creates problem.

Here is the problem with jQuery in Web Parts. I have external JavaScript file which I reference on my web part.

This is my function in a separate JavaScript file.

function CallJS() {

   开发者_运维知识库 alert($("#txt1")); **// It returns the object**
    alert($('#txt1').attr('value')); **// Always return 'undefined'**
    return false;
}

My development environment is VS2008, SharePoint 2007 and jQuery version is 1.4.4.

First try to pass value using jquery attribute like this $('#txt1').attr('value','Test') after passing value try this $('#txt1').attr('value') it returs your value.

In you case solution is that use $('#txt1').val(), or try to pass value dynamically than you can access that value using attribute method.