"Execute asynchronous tasks in Javascript and receive the returned

Question

"Execute asynchronous tasks in Javascript and receive the returned

Currently, I am utilizing JSF ajax within my application and unfortunately, we are unable to make any changes to that. In the process of waiting for user action, I find it necessary to prompt the user before executing the ajax method. Specifically, I need to inquire if the user wishes to revert all changes on the page using a custom dialog. If they choose to proceed with the reversion, I will invoke the Java method through ajax. However, if they decide against it, there is no need to execute the ajax.

To elaborate further:

Here is the code snippet for the revert button in my extensive page:

<h:commandButton value="#{msg.revertBtn}" accesskey="R" styleClass="actionButton" action="#{styleController.revertChanges}">

    <f:ajax execute="@this" onstart="return method();" render="styleCcFormtyleCcTable">

</h:commandButton>

Prior to initiating the ajax, it triggers my javascript function: method()

I require the user to remain engaged in method() until they click either the Yes or No button in my customized confirmation dialog, and then return true or false accordingly.

Do you have any suggestions on how to address this issue?

java javascript ajax jsf customdialog

Answer 1

Answer №1

To prevent the default action of a button, you should attach an event listener to the button's `onclick` handler and return true or false based on whether you want to block the action. Attempting to block the action after the ajax request has already been executed will be too late.

One way to achieve this is by using JavaScript's built-in `confirm()` function as shown in the example below:

<h:commandButton ... onclick="return confirm('Are you sure?')">
    <f:ajax execute="@this" render="styleCcFormtyleCcTable" />
</h:commandButton>

Answer 2

To prevent the default action of a button, you should attach an event listener to the button's `onclick` handler and return true or false based on whether you want to block the action. Attempting to block the action after the ajax request has already been executed will be too late.

One way to achieve this is by using JavaScript's built-in `confirm()` function as shown in the example below:

<h:commandButton ... onclick="return confirm('Are you sure?')">
    <f:ajax execute="@this" render="styleCcFormtyleCcTable" />
</h:commandButton>

Answer 3

Answer №2

It may not be the most conventional method, but I found a workaround that made it work for me.

Basically, I created a Custom Confirm Dialog with a variable to store the user's reply. When the user clicks on a button, their reply is stored in this variable.

Then, I added a click function to the button that checks the variable. If there is a reply, it proceeds with an action. If not, my custom dialog is called again.

Within the custom dialog, I simulate a button click with the saved reply. Just remember to clear the variable afterwards.

It took me two days to figure out this solution. Let me know if you want the code for it!

Answer 4

It may not be the most conventional method, but I found a workaround that made it work for me.

Basically, I created a Custom Confirm Dialog with a variable to store the user's reply. When the user clicks on a button, their reply is stored in this variable.

Then, I added a click function to the button that checks the variable. If there is a reply, it proceeds with an action. If not, my custom dialog is called again.

Within the custom dialog, I simulate a button click with the saved reply. Just remember to clear the variable afterwards.

It took me two days to figure out this solution. Let me know if you want the code for it!

"Execute asynchronous tasks in Javascript and receive the returned

Answer №1

Answer №2

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