I have a vf page tied to a force.com site which is being used at different places on my company website like support FAQ page, new account request etc and I want to pre populate the subject field on my vf page based on the page the user is redirected from.

Is this possible?

This is what i have now <apex:inputField required="true" value="{!c.Subject}" id="subject" />

1 Answer 1


Yes, it is possible.

You should implement a controller Extension that modifies the field subject of your object if is there a "subject" parameter in the url, just something as following:

public class CustomExtension {
    Private ApexPages.StandardController stdController;
    Private Case c;

    public CustomExtension(ApexPages.StandardController stdController) {
        this.stdController = stdController;
        c = (case)this.stdController.getRecord();

        //Perform actions...


    private void updateSubject() {
        // Check if param exists and assign it.
        if(ApexPages.currentPage().getParameters().containsKey('subject')) {
            c.subject = ApexPages.currentPage().getParameters().get('subject');

The url should contain your parameter, something as following...

  • Hi Dahn, thanks for your response, my force.com site is XXX-XXXX.csxx.force.com/form which is hosted on mycompanydomain.com/support. Now when a user is redirected to my force.com site from my company's support page, i want the subject field on my vf page to pre-populate to 'support'. I tried ApexPages.currentPage().getParameters().get('retURL') but debug logs return NULL for retURL
    – Khyber
    Mar 11, 2019 at 19:58
  • 1
    ApexPages.currentPage().getParameters().get('YourGetParamName'). This function returns for your GET param name. Your GET param name is defined before the "=". In your previous case: subject=My%20Subject. If you wanted to add a param to your url called 'support' you should append at the end of your url "&support=yourValue" (without quotes, for instance: /apex/CustomVisualforce?id=5001i000003COdIAAW&subject=My%20Subject&support=My%20Support%20Value) and assign it to your variable binded to your visualforce.
    – Dahn
    Mar 13, 2019 at 9:18

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