ASP.NET AJAX $find method failes when used in jQuery's $(document).ready() method

问题

I'm trying to find a tree using ASP.NET AJAX's client-side framework. I also use jQuery for doing any JavaScript operation after the DOM is ready. my code is like:

$(function(){
    var tree = $find('treeId');
});

Here, tree simply is null. But when I try to find the tree on click of one of elements, it's not null:

$(function(){
    $('saveButton').click(function(){
        var tree = $find('treeId');
    }):
});

回答1:

this worked for me with Telerik controls:

$telerik.$(document).ready(function () {
    var tree = $telerik.$find("<%=RadTreeView1.ClientID%>");
});

see this http://www.telerik.com/help/aspnet-ajax/introduction-using-jquery.html

回答2:

Try using ASP.NET Ajax DOM Ready.

Sys.onReady(function() {
    //DOM is ready to access and use
    var tree = $find('treeId');
});

回答3:

I have had problems with the telerik controls and ClientIDMode="Static" before. I simply removed this attribute and used $find('<%= Radtree1.ClientID %>') and it worked.

Edit: Following on from the accepted answer, you can set the default $ to use jquery by pointing it to the telerik $.

window.$ = $telerik.$

If you do that on the site.master (or anywhere global) you'll be able to use jquery as normal.

来源：https://stackoverflow.com/questions/6452881/asp-net-ajax-find-method-failes-when-used-in-jquerys-document-ready-metho