AngularJS with ASP.NET Updatepanel partial update

All we need is an easy explanation of the problem, so here it is.

I’m new to AngularJS, so this might be a trivial question.

The problem I’m facing is that the AngularJS bindings {{Object.Field}} reverting to un formatted state whenever there is an update-panel partial update. I understand that the update-panel is replacing the DOM with the non formatted text({{Object.Field}}), but I’m not able to make angular re-evaluate the piece of HTML that was injected by the update panel.

What I’ve tried so far:

  • Got a handle to the scope of the controller from the End_Request of the update panel and wrapped the update function on the controller inside of a $scope.apply();
  • Called the $scope.compile at the same place and also inside the controller, with no result changes.
  • Tried replacing with a directive, but I don’t think this is what I want.

I can get a handle to the DOM inside the controller and change it directly, but I understand that this is not a recommended approach and hence I’m here asking this question.

How do I make angular re-evaluate the piece of HTML, replaced/injected by an update panel’s partial update?

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

You need to compile the template again within the End_Request of PageRequestManager. I used a div with an id so I could reference the element of interest within the End_Request function.

The javascript code:

var mod = angular.module("myApp", []);

mod.controller("MainController", function ($scope, $compile) {
    $ = {};
    $ = "world";

    Sys.WebForms.PageRequestManager.getInstance().add_endRequest(function (sender, args) {
        var elem = angular.element(document.getElementById("angularTemplate"));


The aspx code:

<body ng-app="myApp" ng-controller="MainController">
    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                <div id="angularTemplate">
                    Hello, {{}}

                <asp:Button ID="btnUpdate" runat="server" Text="Update Me" />

Clicking the “Update Me” button will keep “Hello, world” in the template. The key is to also call $scope.$apply() in the End_Request as this is technically run outside of angular.

Method 2

If you have a dynamic content and Angular bindings, this solution might not be enough for you.

I’ve tried to implement this solution and it almost worked. I saw the HTML content of the directive that inside the .NET application, but all Angular bindings, like ng-repeat and ng-click, didn’t work.

I’ve found the solution here:

You need to manually initialize your module in the add_endRequest event:

Sys.WebForms.PageRequestManager.getInstance().add_endRequest(function (sender, args) {
                angular.bootstrap($('#myDiv'), ['myNgApp']);

This solution was enough, and I removed the solution with the $compile.

You can read about angular.bootstrap in the documentation:

Method 3

These solution are good and well enough explained. But still if some-one is struggling with Update panel and AngularJs, Here’s one shot but unethical solution

First define a global variable in your aspx page

var myTempScope;

Then do this in you document.ready event

    myTempScope = angular.element($("#myAngularDiv")).scope() ;

and then when you are calling an angular function from your aspx page like

function callAngularFunction() {
    if(angular.element($("#myAngularDiv")).scope() == undefined)

In my case this was working fine.

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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