Скачать или смотреть How to Fix Text Interpolation Issues Inside ng-template in Angular

Discover how to dynamically pass video URLs into `ng-template` in Angular without hardcoding using a safe method.
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Solving the Text Interpolation Issue with ng-template in Angular

When working with Angular applications, developers often encounter various issues that can disrupt their flow. One common problem is how to handle dynamic content, particularly when using templates. If you've ever tried to pass a video URL into an ng-template with text interpolation and found it didn't work, you’re not alone. This guide will walk you through the solution to this frustrating issue, so you can dynamically pass video URLs without hardcoding them in your HTML.

The Problem

Imagine you have the following HTML structure in your Angular application. You want to pass a video URL dynamically to an iframe located inside an ng-template:

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In the TypeScript file, the video variable is defined as follows:

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While it’s apparent that hardcoding this URL directly into the iframe works fine, using text interpolation (like {{video}}) fails. This inconsistency can confuse developers, as it seems like standard Angular behavior should apply here. But why does it fail? Let’s explore the solution.

The Solution

The problem lies in Angular's security model, which restricts certain types of bindings for the sake of preventing security risks. Fortunately, there is a simple solution to safely include dynamically generated URLs. Here’s how you can do it:

Step 1: Use Angular’s DomSanitizer

To allow the secure binding of the URL, you need to utilize Angular’s DomSanitizer. This service helps to sanitize the URL that you want to use in your template. Here’s how to implement it in your code.

In Your TypeScript File:

Import the necessary module:

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Use the DomSanitizer in your constructor:

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Create a variable to hold the safe URL and assign it during component initialization:

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Step 2: Update Your HTML Component

Now that the URL is sanitized and safe, you can bind it directly to your iframe using Angular’s property binding syntax.

In Your HTML:

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Conclusion

With the above changes, you can dynamically pass video URLs into your ng-template without hardcoding them. This solution leverages Angular's built-in security features while ensuring your code remains clean and easy to maintain.

By following these steps, you can effectively solve the issue of text interpolation in ng-template and make your Angular application more dynamic.

Troubleshooting issues like this can often feel overwhelming, but with the right tools and knowledge, you can tackle them with confidence. Happy coding!