Скачать или смотреть Learning How to Build Your Html.Partial String in JavaScript

Discover how to build your `Html.Partial` strings using JavaScript, create an AJAX call for seamless integration in your ASP.NET application, and enhance your web development skills.
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This video is based on the question https://stackoverflow.com/q/62478903/ asked by the user 'nonesuch' ( https://stackoverflow.com/u/1718209/ ) and on the answer https://stackoverflow.com/a/62486867/ provided by the user 'Bemn' ( https://stackoverflow.com/u/13742790/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

In modern web development, integrating JavaScript with server-side languages can be challenging, especially when you need dynamic rendering of views. Suppose you find yourself needing to build Html.Partial strings based on user interactions in your JavaScript code. This issue arises often in ASP.NET projects, creating a need for a systematic solution. Let's dive into the specific problem and explore an effective strategy to resolve it.

The Problem

You might be working with a JavaScript function designed to react to user clicks on tabs or items, and part of that functionality includes rendering a partial view based on the user’s choice. Here's a simplified version of your function:

[[See Video to Reveal this Text or Code Snippet]]

As it stands, this code fails because the url variable does not exist within the Razor syntax you've used for Html.Partial. This creates a very frustrating situation where you want dynamic rendering but can't achieve it with the current approach.

Solution Overview

What you really want is to render a HTML code segment based on a JavaScript variable. To accomplish this, we'll take advantage of AJAX calls to retrieve the necessary partial views dynamically.

Step 1: Set Up Your Controller Action

First, you need to create a new action in your controller that will handle the AJAX requests from your frontend. This action will accept the name of the partial view that you want to return.

Here’s an example of how you can define this action:

[[See Video to Reveal this Text or Code Snippet]]

Explanation:

HTTP GET allows your JavaScript to call this action easily.

partialViewName is a string parameter that specifies which partial view to render.

The new ActivityLog() is used to pass any model data needed for the partial view.

Step 2: Create Your Partial View

Next, create your partial view under the appropriate directory within your ASP.NET project. Make sure to name it according to the data you expect to pass. For example, if your path is _myView, then your file should be _myView.cshtml.

Step 3: Fire an AJAX Call from Your Frontend

Now, let's modify your JavaScript function to make an AJAX call to retrieve your desired partial view based on the user's selection.

You'll want to do something like this:

[[See Video to Reveal this Text or Code Snippet]]

Explanation:

$.get() is used to send a GET request to your action method.

The partialViewName variable is set to the updated URL for your partial view.

The .done() function handles the successful return of HTML data, injecting it into the specified container on your web page.

The .fail() function can provide feedback if the view is not found, enhancing user experience.

Conclusion

By following these steps, you can seamlessly build your Html.Partial strings in JavaScript and dynamically load content based on user interactions. This not only improves the user experience but also makes your application more robust and adaptable.

Feel free to refer back to this guide whenever you’re tasked with needing dynamic partial view rendering in an ASP.NET context. Happy coding!