Скачать или смотреть How to Set the hide Attribute in HTML with JavaScript

Learn how to effectively manage the HTML `hide` attribute using JavaScript. Discover the pitfalls related to form submission and get practical solutions.
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This video is based on the question https://stackoverflow.com/q/65904336/ asked by the user 'frederik' ( https://stackoverflow.com/u/13659433/ ) and on the answer https://stackoverflow.com/a/65904397/ provided by the user 'Quentin' ( https://stackoverflow.com/u/19068/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Set the hide Attribute in HTML with JavaScript

If you're working with HTML forms and JavaScript, you might encounter the situation where you attempt to hide an element using the hidden attribute, only to find that it resets almost immediately after clicking a button. This frustrating behavior typically occurs when the button in question is a submit button within a form. Understanding how to properly manage the hide attribute can streamline your user interface and create a better experience for users. In this post, we’ll break down how to appropriately set the hide attribute and address the common pitfalls associated with form submissions.

The Problem

Let's set the stage with the following code snippet for an HTML form:

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

When you click the button that triggers the hide() function, the form element becomes hidden for just a brief moment—then it reappears. This happens because the form automatically submits after the button is clicked, causing the page to reload. The newly loaded page does not have the form hidden, which is likely not the intended effect.

Understanding the Issue

When you click the button, here's what happens in a sequence:

The JavaScript function hide() executes.

The form element is hidden as expected.

The form submits, triggering a page reload.

The new page doesn't have the same hidden state, so the form is visible again.

To avoid this behavior, consider the following:

Avoid using a submit button: If you don't need the form to submit at that moment, you can change the button type. Instead of the default type, use type="button" for buttons that will trigger JavaScript actions without submitting the form.

Correcting the Button Type

To fix the issue and prevent the form from submitting when you just want to hide the element, you can change the button's type like this:

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

By setting the button's type to button, clicking it will prevent the default form submission behavior, allowing the hide() function to execute and keep the form hidden.

Alternative Solutions

In situations where you do want the form to submit, here are some options to consider:

Persist the hidden State with Server-Side Code: If you require the form to submit but want to retain the hidden state, you will need to implement server-side code. This code would read the form data and determine whether to set the form to hidden once the page reloads. Ensure that your submit button has a name and value that your server-side script can recognize.

Use Local Storage: Another approach is to use JavaScript's local storage to save the state of the form. Before the form submission, you can store whether the form is hidden or visible. After the page reloads, check this value and set the visibility accordingly.

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

Conclusion

Managing the hide attribute in HTML using JavaScript can enhance user interaction within your web forms. By understanding how form submissions work and properly managing button types, you can avoid common frustrations related to unwanted page reloads. Whether you use button types or advanced techniques like server-side scripting or local storage, focus on providing a seamless experience for users. Make sure your implementation fits the specific requirements of your application for optimal results.

By following these guidelines, you'll ensure that your HTML forms function as intended, keeping your user interface clean and effective. Happy coding!