How to Dynamically Change Paragraph Text on Button Click in HTML Using JavaScript

Learn how to change the text of a paragraph with multiple buttons in an HTML page using JavaScript and Jinja template syntax. Simple and effective solutions for beginners!
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How to Dynamically Change Paragraph Text on Button Click in HTML Using JavaScript

When working on web applications, you might encounter the need to change text or other content dynamically based on user interactions. One common scenario is when you have multiple buttons that, when clicked, should display different text in a designated paragraph. If you're working with a templating engine like Jinja (used in Flask applications), this can present some challenges.

This guide will guide you through solving the problem of changing the text of a paragraph based on which button is clicked, while ensuring that you can handle multiple buttons effectively.

The Problem: Changing Paragraph Text with Button Clicks

Imagine you have a series of buttons generated via a Jinja loop on an HTML page. Each button should, when clicked, display unique text in a paragraph. However, many users, especially those who are new to JavaScript and web development, find that all buttons reference the same source of text, typically that of the last element in the loop.

Here’s a snippet of the initial code illustrating this issue:

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

This code will not behave as desired because every button calls the same change_text function without passing in unique data.

The Solution: Passing Parameters to JavaScript Function

To address this issue, we need to modify the change_text function so that it can accept a parameter. By passing the text directly through the button's onclick event, each button will send its specific text to the function upon being clicked.

Step 1: Update the JavaScript Function

Here’s how to update the existing change_text function:

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

In this updated function, we’ve introduced a text parameter that the function will utilize to change the paragraph content.

Step 2: Adjust the Button Click Event

Next, we need to modify the loop that generates the buttons so that each button passes its unique text to the change_text function. Here is how it can be accomplished:

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

Summary of the Changes

JavaScript Function: Modify to accept a parameter that represents the text to display.

Button Onclick: Change the onclick attribute to pass the specific text for each button.

With these adjustments, each button will correctly display its unique text in the specified paragraph when clicked, solving the initial problem.

Conclusion

Using a templating engine such as Jinja within a Flask application can initially make dynamic content somewhat tricky. However, by understanding how to pass parameters to your JavaScript functions, you can control the output based on user interactions efficiently.

Now you can implement this solution in your project and enhance the interactivity of your web application. Enjoy coding with a clearer understanding of how to manage dynamic content!