Add Custom field to the form

I am trying to use the following example for passing a value entered in the import form to "Before Import". I am getting the following error on execution: Input:{"failed":true,"message":""}
I am not sure what you mean by:
Make sure you specify the field ID? Do i need to insert a text field in the form to hold the entered value?

1. Proceed to the Editor page, switch to the HTML mode and add a custom input field to your form. Make sure you specify the field ID.
   <INPUT id=test type=text>
2. Add the following code to the JavaScript OnLoad event of the page where the custom field was added:
   this.on('beforeSave', function(formObj, fieldControlsArr, pageObj){
   var val = $("#test").val();
   formObj.baseParams['test'] = val;
   });
3. In any event like Before record added or Before process use $_REQUEST["test"] to access the custom field value.

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