Basically we used immediate="true" in CommandButton & CommandLink, when we don’t want our validation rules to be fired during any server request.
It is a Boolean value that specifies whether the action associated with this component should happen immediately, without processing any validation rules associated with the fields on the page. If set to true, the action happens immediately and validation rules are skipped. If not specified, this value defaults to false.
We generally use it to make functionality of “Cancel” button or “Back” button, where we don’t want validation rule to get executed. If we don’t use immediate=true then on click of cancel button also, validation rules will get executed.
Sometimes we need to call a method of an apex class, on click of a custom button. Let’s take an example, how we call an apex method, on click of a custom button. Step 1:
Lets first create the Apex class.
global class MyClass {
webservice static String myMethod(String studentId){
return 'Test';
}
}
Note:
Class needs to be a Global class.
And the method you intend to call from the javascript must be a Webservice Method.
Step 2:
Now to setup the custom Button.
Goto –> Setup –> Object –> Buttons, links and Actions section –> Click New Button or Link
Enter the Name of the button.
Behaviour : Execute Javascript.
Content source : On-Click Javascript.
In the code for button copy the following line of codes:
{!REQUIRESCRIPT("/soap/ajax/14.0/connection.js")}
{!REQUIRESCRIPT("/soap/ajax/14.0/apex.js")}
try{
var studentId = '{!Student__c.Id}';
var result = sforce.apex.execute("MyClass", "myMethod",{studentId : studentId});
alert(result);
}
catch(ex) {
alert(ex);
}
