How to execute Apex from Custom button or Javascript?

In this case you can use apex action function.

Example

VF Page---
<apex:page Controller="myController">
<apex:form>
<apex:actionFunction name="callAction" action="{!myFunction}" />
<button type="button" onclick="callAction()">Call My Function</button>
<apex:outputPanel rendered="{!panel}">
Controller function Called.
</apex:outputPanel>
</apex:form>
</apex:page>

Apex Class---
public class myController {
public Boolean panel {get;set;}
public myController(){
panel = false;
}
public void myFunction(){
panel = true;
}
}

Hi,

global class MyClass
{
webservice static void myMethod() // you can pass parameters
{
// Do something
}
}

Now create a 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

use below JS:

{!REQUIRESCRIPT("/soap/ajax/30.0/connection.js")}
{!REQUIRESCRIPT("/soap/ajax/30.0/apex.js")}

if({!Account__c.Name}!=Null)
{
sforce.apex.execute("SampleClass","sampleMethod",{}"});
alert("This is {!Account__c.Name}");
}

Thanks

Hi,

Example -

You have to make use of AJAX toolkit to call the method in Apex Controller.

{!REQUIRESCRIPT("/soap/ajax/30.0/connection.js")}
{!REQUIRESCRIPT("/soap/ajax/30.0/apex.js")}
//sforce.apex.execute("classname","methodname","parameters seperated by comma");
sforce.apex.execute("classname","removeItemFromEbayList");
The consideration for this is that the class and the methods should be global and webservice. so you should modify the access modifier in your class to global and method from public to webservice.

Hope this helps.