"Integrating Angular templates with .NET for seamless Partial Postback functionality

Question

"Integrating Angular templates with .NET for seamless Partial Postback functionality

I'm having difficulty getting Angular to work with partial postbacks in .Net.

My issue is similar to this question: Re-initialize Angular bindings after partial postback

The problem arises when switching between tabs - one containing an Angular app and the other a C# control. After a partial postback, returning to the Angular tab results in nothing being displayed.

I've tried using ngView routing and $route.reload(), but the template is pulled down without any effect on the page. I also attempted using compile(templateCache.get(lazyTableControllerRoute.current.templateUrl))(scope) as suggested here, but to no avail.

Any assistance would be greatly appreciated :)

After each postback, I add the following HTML to the page:

LiteralControl lazyControl = new LiteralControl("<div ng-app=\"LazyLoadingApp\" style=\"padding:10px\" ng-controller=\"LazyTableController\" ng-view><lazy-table> </lazy-table></div>");
Controls.Add(lazyControl);

Additionally, I include some configuration constants like templateUrl.

Here is my code :

(pre-review code omitted for brevity)

UPDATE:

I attempted to use require.js... My goal was to bootstrap elements after a partial postback by creating a simple test case where a button triggers a partial postback within an Update Panel alongside my app. When the app disappeared after clicking, I tried the following in the console:

angular.bootstrap(document, ['LazyLoadingApp'])

However, I encountered an error that I couldn't resolve:

App Already Bootstrapped with this Element 'document'

Here is a plunker showcasing the app in a require.js setup (please note it's only for code review purposes).

c#javascript asp.net angularjs partial-postback

Answer 1

Answer №1

Avoid using ng-app and angular.bootstrap simultaneously.
Have you initialized "ng-app"? If yes, refrain from doing so.

Visit ngtutorial.com/learn/bootstrap for more information.

Answer 2

Avoid using ng-app and angular.bootstrap simultaneously.
Have you initialized "ng-app"? If yes, refrain from doing so.

Visit ngtutorial.com/learn/bootstrap for more information.

Answer 3

Answer №2

Great news! The issue has been resolved. If you want to work with partial postbacks, follow these steps:

To define the app, make sure to remove ng-app from the HTML and structure it like this:

<base href="/">
<asp:UpdatePanel ID="updatePanel" runat="server" UpdateMode="Conditional">
    <ContentTemplate>
         <asp:Button ID="fire" runat="server" Text="fire!" />
            <div id="parent" >  <div id="boodstapped" ng-view ></div></div>

    </ContentTemplate>
</asp:UpdatePanel>

For instantiating the app, use the following code:

var app = angular.module('LazyLoadingApp', ['ui.bootstrap', 'ngRoute']);
jQuery(document).ready(function ($) {
    var prm = Sys.WebForms.PageRequestManager.getInstance();
    function EndRequestHandler(sender, args) {
        jQuery('#parent').children().remove();
        jQuery('#parent').append('<div id="boodstapped" ng-view ></div>');
        angular.bootstrap(jQuery('#boodstapped'), ['LazyLoadingApp']);
    }
    prm.add_endRequest(EndRequestHandler);
});

When attempting a partial postback, the EndRequestHandler will bootstrap the app again. Remember to remove the previously bootstrapped element to prevent any Angular "already bootstrapped" errors.

For further details, visit this link.

Answer 4

Great news! The issue has been resolved. If you want to work with partial postbacks, follow these steps:

To define the app, make sure to remove ng-app from the HTML and structure it like this:

<base href="/">
<asp:UpdatePanel ID="updatePanel" runat="server" UpdateMode="Conditional">
    <ContentTemplate>
         <asp:Button ID="fire" runat="server" Text="fire!" />
            <div id="parent" >  <div id="boodstapped" ng-view ></div></div>

    </ContentTemplate>
</asp:UpdatePanel>

For instantiating the app, use the following code:

var app = angular.module('LazyLoadingApp', ['ui.bootstrap', 'ngRoute']);
jQuery(document).ready(function ($) {
    var prm = Sys.WebForms.PageRequestManager.getInstance();
    function EndRequestHandler(sender, args) {
        jQuery('#parent').children().remove();
        jQuery('#parent').append('<div id="boodstapped" ng-view ></div>');
        angular.bootstrap(jQuery('#boodstapped'), ['LazyLoadingApp']);
    }
    prm.add_endRequest(EndRequestHandler);
});

When attempting a partial postback, the EndRequestHandler will bootstrap the app again. Remember to remove the previously bootstrapped element to prevent any Angular "already bootstrapped" errors.

For further details, visit this link.

Answer 5

Answer №3

While it is possible that the other solutions may work, I have personally found that avoiding a 'mixed' state of .net controls and angular controls that rely on interaction between the two is the best approach.

The process for resolving this issue is not well-documented, leading to writing excessive amounts of code to handle simple tasks.

I would caution against using the following method long-term, but rather suggest it as a temporary or transitional solution. It's worth noting that this approach may not be applicable in every scenario. However, one option is to address the problem from the dot.net side and then redirect back to the current page as shown below:

      protected void cbChecked_My_DotNet_CallBack(object sender, EventArgs e)
        {
             DoDotNetStuff();
             if(NeedToSignalToAngular){
                   response.redirect(yourpage.aspx?yourparams=xxx)     
             }
         }

Answer 6

While it is possible that the other solutions may work, I have personally found that avoiding a 'mixed' state of .net controls and angular controls that rely on interaction between the two is the best approach.

The process for resolving this issue is not well-documented, leading to writing excessive amounts of code to handle simple tasks.

I would caution against using the following method long-term, but rather suggest it as a temporary or transitional solution. It's worth noting that this approach may not be applicable in every scenario. However, one option is to address the problem from the dot.net side and then redirect back to the current page as shown below:

      protected void cbChecked_My_DotNet_CallBack(object sender, EventArgs e)
        {
             DoDotNetStuff();
             if(NeedToSignalToAngular){
                   response.redirect(yourpage.aspx?yourparams=xxx)     
             }
         }

"Integrating Angular templates with .NET for seamless Partial Postback functionality

Answer №1

Answer №2

Answer №3

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