Скачать или смотреть How to Use querySelectorAll with Multiple Attributes and Dynamic Values in JavaScript

Learn how to effectively use `querySelectorAll` in JavaScript to find selected checkbox items with dynamic attribute values. This guide provides a clear solution and helpful examples.
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This video is based on the question https://stackoverflow.com/q/74876330/ asked by the user 'Jane Delugas' ( https://stackoverflow.com/u/5646608/ ) and on the answer https://stackoverflow.com/a/74876540/ provided by the user 'Shadab' ( https://stackoverflow.com/u/10716685/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Finding Selected Checkboxes with Dynamic Attributes in JavaScript

When working with forms in JavaScript, a common challenge is retrieving elements based on multiple attributes. For instance, you might need to find all selected checkboxes that match a dynamic value for a specific attribute, such as pageid. In this guide, we will address how to effectively use querySelectorAll to tackle this problem.

The Problem

Imagine you have a series of checkboxes on your webpage, where each checkbox has a pageid attribute that corresponds to different pages or sections of your application. You want to select all the checkboxes that are checked and have a pageid matching a given variable. Here's a simple example of one of the checkboxes:

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

You might expect that through the use of a template string, you could form a query that correctly identifies the desired checkboxes. However, using template literals in your query string like this can lead to an error:

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

Instead of returning the expected results, this could generate an error such as:

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

This indicates a misunderstanding of the selector syntax.

The Solution

Here’s the correct way to utilize querySelectorAll to find all checked checkboxes with a dynamic pageid value.

Correct Selector Syntax

Your selector needs to contain the input type and the attributes in the correct order without the extra brackets. Here is how you can structure your code to avoid errors:

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

Explanation

Dynamic Value: By including ${myPageIDVariable} in the string template, you can dynamically set the pageid based on a variable.

Proper Attribute and Type Selection: The correct format to check attributes should follow the idea of type and then [attribute] for better clarity and function.

Example Output

After running the above code, you can convert the NodeList of checkboxes to an array for easier manipulation and logging:

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

This line will log all checked checkboxes with the specified pageid to the console.

Conclusion

Using the querySelectorAll method in JavaScript combines the power of CSS selectors with the ability to dynamically handle and fetch elements based on their attributes. By correctly structuring your query string, you can efficiently retrieve the elements you need without encountering errors. Next time you need to filter elements with multiple criteria, remember to keep your selector syntax in check and enjoy the simplicity of JavaScript queries!