Introduction
In this comprehensive blog post, we will explore the concept of AJAX callback inĀ Oracle APEX, understand their significance, and learn how to utilize them to enhance the user experience and application functionality.
Step 1: Create a new dynamic action:
- Go to the “App Builder” section of Oracle APEX.
- Navigate to the page where you want to create the AJAX callback.
- Click on “Create” and select “Dynamic Action” from the drop-down menu.
- Provide a name for the dynamic action and select the appropriate event that triggers the action (e.g., button click, change event, etc.).
Step 2: Define the action:
- In the “When” section of the dynamic action, specify the condition that determines when the dynamic action should execute.
- In the “True” section, click on “Add True Action” and select “Execute JavaScript Code” from the drop-down menu.
Step 3: Write the AJAX callback code:
- In the “JavaScript Code” section, you can write the code to perform the AJAX request. Here’s an example:
// Get the AJAX request object
var xmlhttp = new XMLHttpRequest();
// Define the callback function
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState === 4 && xmlhttp.status === 200) {
// Process the response here
var response = xmlhttp.responseText;
// Perform any necessary actions with the response
}
};
// Specify the AJAX request details
xmlhttp.open("GET", "ajax_endpoint_url", true);
// Set any necessary request headers
// xmlhttp.setRequestHeader("header_name", "header_value");
// Send the request
xmlhttp.send();
Replace "ajax_endpoint_url"
with the actual URL of your AJAX endpoint, which could be an Oracle PL/SQL process or a RESTful Web Service.
Step 4: Save and test:
- Click on “Save” to save the dynamic action.
- Run your Oracle APEX application and test the AJAX callback by triggering the associated event.
Note: This example demonstrates a basic AJAX callback using the XMLHttpRequest object. Depending on your requirements and preferences, you can also use other libraries such as jQuery or the built-in APEX AJAX functionality for performing AJAX requests.