Passing URL parameters from VF page to custom controller

Question

How can I take a URL parameter and pass it to a custom controller method? For example, I have a button from a case that goes to VF page with its ID in the url. (ex - https://visual.force.com/apex/CustomSearch?caseID=18238345iu3) I want to then press a button on the VF page that will execute a method from my custom controller and use the case ID parameter found in the URL.

Thanks.

Answer 1

When passing parameters in a URL, you can grab the parameter values in your Visualforce Controller by using:

String thecaseID = System.currentPageReference().getParameters().get('caseID');

Answer 2

Simply use this inside your method:

String caseID = Apexpages.currentPage().getParameters().get('caseID');

And then use caseID for anything you want.

Answer 3

Change the name of the parameter to simply "Id", the standard controller will handle it automatically.

Add your custom methods to an Extension controller instead.

<apex:page standardController="Case" 
    extensions="MyCustomCaseControllerExt" showHeader="false">
    <apex:outputText value="{!foo}" />
</apex:page>

In the controller, you don't explicitly have to fetch the Id, it's already done and available to you as you can get the record directly with getRecord()

public class myCaseControllerExtension {

    private final Case myCase;

    // The extension constructor initializes the private member
    // variable Case by using the getRecord method from the standard
    // controller.
    public myCaseControllerExtension(ApexPages.StandardController stdController) {
        this.myCase = (Case)stdController.getRecord();
    }

    public String foo() {
        return 'Something interesting  (' + myCase.id + ')';
    }
}

See: Build an Extension Controller