Скачать или смотреть Loop Through Each Character in a String with ngFor in Angular

Learn how to effectively loop through each character in a string using `ngFor` in Angular, highlighting specific matches to user input for enhanced styling and interactivity.
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Looping Through Each Character in a String with ngFor in Angular

When building interactive user interfaces with Angular, you often encounter situations where you need to display dynamic content from API responses. In this guide, we will address a specific problem faced by many developers: how to loop through each character in a string and apply different styles based on user input. This is particularly useful when you want to emphasize parts of the text that match user queries.

The Challenge

Imagine your application receives a data set from a third-party API based on user input. For example, if a user types "far," the API might return:

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

In this case, the first object is an exact match for the user’s input. Your goal is to display this list on the UI, looping through each character in the result.name while bolding the characters that match the user's input.

The Solution

Step 1: Splitting the String

To loop through each character of a string effectively, we need a way to split the string into individual characters. We will implement a custom Angular pipe called SplitStringPipe. This pipe will transform the input string into an array of characters.

Here's how you can implement the SplitStringPipe:

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

Step 2: Using ngFor to Loop Through the Characters

Next, we will utilize the Angular ngFor directive to iterate over each character of the result.name. Inside the loop, you will create a span for each character, where conditional styling can be applied based on comparisons with the input string.

Here’s an example of how to structure your HTML using ngFor:

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Step 3: Adding Conditional Styles

In the above ngFor block, we are using Angular's [ngStyle] to conditionally apply styling:

fontWeight: This is changed based on whether the character (char) matches the user's input (inputChar).

Final Code Implementation

Assuming that inputChar is the part of the string that matches what the user has entered, here’s the complete integration of the HTML and TypeScript:

HTML Structure:

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Split String Pipe:

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

Conclusion

By following these steps, you’ll be able to effectively loop through each character in a string and apply specific styles based on user input. This enhances the user experience by visually emphasizing matching characters in the search results, which can be crucial in application design for search functionalities.

In case of any additional questions or challenges, don’t hesitate to reach out to the community or explore further resources. Happy coding!