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) {
$scope.data = {};
$scope.data.world = "world";
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(function (sender, args) {
var elem = angular.element(document.getElementById("angularTemplate"));
elem.replaceWith($compile(elem)($scope));
$scope.$apply();
});
});
The aspx code:
<body ng-app="myApp" ng-controller="MainController">
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<div id="angularTemplate">
Hello, {{data.world}}
</div>
<asp:Button ID="btnUpdate" runat="server" Text="Update Me" />
</ContentTemplate>
</asp:UpdatePanel>
</div>
</form>
</body>
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.