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Learn how to effectively return values from ExtJS dialogs with custom events and structured code examples.
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How to Return Value from Ext.Dialog in ExtJS?

When working with ExtJS, one common challenge developers face is how to return a value from a dialog. This task can often become frustrating as there are multiple layers of complexity involved, such as managing the interaction between dialogs and ensuring you can retrieve the selected value asynchronously. In this post, we’ll explore a clear, step-by-step solution to this challenge by leveraging custom events within Ext.Dialog.

Understanding the Problem

The problem at hand consists of two main challenges:

Returning a value from a dialog: You want to capture the user’s selection from the dialog once it is closed.

Waiting for that value: You need to ensure that your code can handle this value instead of proceeding with further execution immediately after the dialog call.

To illustrate, consider the scenario where we need information from a dialog to determine the type of a new view to create. The user is presented with a choice among options A1, A2, A3, or A4, and based on their selection, a different view will be shown.

Example Code of the Scenario

Here’s a brief code snippet demonstrating how to create and display the dialog, but with some gaps on how to retrieve values:

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

Solution Using Custom Events

To effectively manage user selections and retrieve them back from the dialog, we can implement custom events. Here’s how:

Step 1: Modify the Dialog to Use Events

You need to alter the dialog code by adding event listeners to your buttons. This way, when a button is clicked, it will fire a custom event carrying the button’s identifier back to the calling context:

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

Step 2: Listen for the Custom Event on the Dialog Creation

Upon creating an instance of the dialog, set up a listener for the dialogbuttonclick event to handle the button click results appropriately:

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

Conclusion

With the above implementation, you will effectively be able to capture the value selected in the dialog and use it to trigger the creation of new views accordingly. Using custom events not only streamlines the process but also keeps your codebase clean and manageable.

By incorporating these methodologies into your ExtJS applications, you can enhance user interactions while maintaining control of the application's flow. Try these steps in your project, and observe how seamless it becomes to retrieve values from dialogs effectively!