Скачать или смотреть How to Find and Remove Text Portions from InnerHTML in JavaScript

Learn how to effectively `manipulate` innerHTML in JavaScript by finding and removing specific text portions. This guide will walk you through identifying text nodes and deleting characters from HTML elements.
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This video is based on the question https://stackoverflow.com/q/68320472/ asked by the user 'esac' ( https://stackoverflow.com/u/92692/ ) and on the answer https://stackoverflow.com/a/68320702/ provided by the user 'dave' ( https://stackoverflow.com/u/2082673/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Find and Remove Text Portions from InnerHTML in JavaScript

In the world of web development, it's not uncommon to need to manipulate elements of a web page dynamically. One common task is finding and removing specific portions of text from within HTML elements, especially when dealing with mixed content like text and HTML tags. In this guide, we’ll explore a practical solution for how to find and remove the last text portion or specific nth text characters from the innerHTML of a div element using JavaScript.

Understanding the Problem

Consider a scenario where you have a <div> element containing both text and HTML elements. For instance:

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

If you wanted to delete the last character, the first call would remove z from the innerHTML, and a second call would remove g. Additionally, if you wanted to find the 4th character, it would return d.

Clearly, we need a method that precisely targets text nodes while ignoring HTML tags.

Solution Breakdown

To address this, we can break down the solution into two main functions:

Get Text Nodes: This function will iterate through the child nodes of the specified element to gather all text nodes.

Delete nth Character: This function will use the array of text nodes to remove the specific character based on its order.

Step 1: Get Text Nodes Function

The function getTextNodes collects all text nodes from a given element. Here’s the code:

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

Explanation:

The function checks each child of the element passed to it.

If a child node is a text node, it gets added to an array.

The recursive call ensures that text is gathered from nested elements as well.

Step 2: Delete nth Character Function

Next, we will implement the deleteNthCharacter function:

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

Explanation:

The function first adjusts the index to make it "1-indexed".

It retrieves the text nodes and calculates their cumulative lengths.

Once it finds the correct node containing the character to delete, it modifies textContent to remove the character.

Example Usage

To utilize these functions, you can use:

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

Conclusion

By leveraging JavaScript and understanding the DOM, you can effectively manipulate the innerHTML of elements. This guide provided a structured approach to finding and removing specific text portions comfortably, enhancing your web development toolkit.

Feel free to experiment with the code and adjust it according to your needs!