Скачать или смотреть Building a DOM Traversing Function to Represent Form Structures and Values

Learn how to create a JavaScript function that navigates DOM elements to return a structured object representing form input values.
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This video is based on the question https://stackoverflow.com/q/73155686/ asked by the user 'Alpesh Nakrani' ( https://stackoverflow.com/u/9371992/ ) and on the answer https://stackoverflow.com/a/73155910/ provided by the user 'IT goldman' ( https://stackoverflow.com/u/3807365/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Building a DOM Traversing Function to Represent Form Structures and Values

Navigating the Document Object Model (DOM) can be daunting for many developers, especially when working with forms that contain nested input names. This post will guide you through creating a function that accepts a form's ID as input and returns an object representing the structure and values of that form. Let's dive into the problem and solution step by step.

The Problem

When you're dealing with forms in HTML, inputs can have complex names that denote their hierarchy. For example, consider the following simple HTML structure containing two forms:

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The challenge is to write a JavaScript function that traverses these forms and returns an object format for their values. Here are the expected results:

For form1, you would expect:

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For form2, it should yield:

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The Solution

To tackle this, we'll write a JavaScript function that iterates over the inputs of the form, constructs the object dynamically based on the nested structure defined by the input names. Here’s how we can achieve this:

Step-by-Step Breakdown

Select the Form and Inputs: We'll first select the specified form and its inputs using document.querySelectorAll().

Create an Empty Result Object: This object will be used to build our final output.

Iterate Over Each Input: For each input, we will split their names by the dot (.) and traverse or create properties in our result object accordingly.

Preserve Context: We'll maintain a reference to the current level in our nested structure to place the value correctly.

Implementation

Here's the complete function you can use:

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How It Works

Input Selection: The code gets the form and all input elements within that form.

Dynamic Object Creation: As it loops through each input, it splits the name into components. For each component, it either creates a new object or traverses existing ones.

Setting Values: After building the structure, it sets the actual input value at the appropriately created place in the object.

Usage Example

To use this function, simply call it with the ID of the form you want to traverse:

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Conclusion

Now you have a reusable function that can dynamically traverse any given form's DOM structure and return an object representation of the input values. This approach is beneficial for managing complex forms in your web applications, streamlining data handling for submission or processing.

With this method, you'll enhance your coding skills in JavaScript and better understand how to manipulate the DOM effectively. Happy coding!