Use Javascript to set a new value for an embedded data variable based upon a selected choice

I want to use javascript to set a value for an embedded data variable based upon a selected choice. I'm not familiar with JS, so here is my poor adaptation from the JSI example from Qualtrics (with most of it commented out). I'm basically using this variable to change the descriptive text. The variable "ModeScript" has a default value established int he beginning of the survey flow. Since I need it to change within a block, I'm trying to use Javascript to change it if someone selects the recodedvalue choice three.
Qualtrics.SurveyEngine.addOnload(function()
{
//create Qualtrics.SurveyEngine.QuestionData object
Qualtrics.SurveyEngine.addOnload(function ()
{
//disables the next button on the page
//this.disableNextButton();
//question click is a simple onclick handler
//attached to the question's container div
this.questionclick = function(event,element)
{
//by default you get the click event as the first parameter and the clicked element as the second parameter
console.log(event, element);
if (element.type == 'radio')
{
var choiceNum = element.id.split('~')[2];
//alert('You clicked on choice '+choiceNum);
// if (choiceNum == 3)
// {
//Qualtrics.SurveyEngine.setEmbeddedData('ModeScript', 'Test');
//enables the next button - Note that the QuestionData object is bound to this to make it easier to use
//this.enableNextButton();
// }
//else
// {
//disables the next button
// this.disableNextButton();
// }
}
}
});

});

Qualtrics.SurveyEngine.addOnReady(function()
{
/*Place your JavaScript here to run when the page is fully displayed*/

});

Qualtrics.SurveyEngine.addOnUnload(function()
{
/*Place your JavaScript here to run when the page is unloaded*/

});

Qualtrics.SurveyEngine.addOnPageSubmit(function(type)
{
if (choiceNum == 3)
{
Qualtrics.SurveyEngine.setEmbeddedData('ModeScript', 'Test');
}
});