How to Change an Image on Click in Ionic Framework

Learn how to dynamically change images in your Ionic applications using a simple and effective method!
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This video is based on the question https://stackoverflow.com/q/62572604/ asked by the user 'maceo bs' ( https://stackoverflow.com/u/12677435/ ) and on the answer https://stackoverflow.com/a/62572898/ provided by the user 'Harish' ( https://stackoverflow.com/u/6303929/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Changing an Image on Button Click in Ionic Framework

In the world of web development, particularly when working with frameworks like Ionic, it’s common to want to update the user interface based on user actions. One popular request is the ability to change an image when a user clicks a button. In this guide, we’ll provide a clear and concise solution to help you accomplish this task seamlessly.

Understanding the Problem

Imagine you have an Ionic application where you want to display different images based on user interaction. You might have already set up your HTML and TypeScript files, but if the image doesn't change when you click the button, you could be running into a common mistake: trying to access an array item incorrectly. This leads to frustration and confusion.

Example Scenario

You have an HTML file with the following code:

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Your TypeScript file might look something like this:

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Identifying the Issue

The problem in the above code lies in how you are trying to access the images in the cards array. The line <img [src]="cards.img" /> suggests that you are trying to pull the img property from an array directly, which isn't valid since cards is an array and doesn't have a single img property.

Implementing the Solution

To fix this problem, we'll need to introduce a new variable that helps track which image should be displayed and update the HTML to use this new variable. Follow these steps to get it working:

Step 1: Create a Selected Index Variable

Add a selectedCardIndex variable in your TypeScript file to keep track of which image is currently displayed.

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Step 2: Update Your HTML

Change your HTML to reference the selectedCardIndex correctly to show the current image.

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Final Code Overview

Here's what the complete implementation looks like after making the necessary changes:

HTML

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TypeScript

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Conclusion

In this guide, we’ve explored a simple yet effective solution to change an image on button click in the Ionic framework. By using an index variable to track the current image and updating the HTML accordingly, you can create a more interactive and engaging user experience. Now go ahead and add this feature to your Ionic application and watch the magic happen!