I am trying to populate the "From" look up field using custom JavaScript in Dynamics CRM.

I'm new to JavaScript and Dynamics really struggling to do this.

Below is a screenshot of my code and solution.

function PopulateFromLookUpField(executionContext) {

var formContext = executionContext.getFormContext();

var value = new Array(); //create a new object array
value[0] = new Object();
value[0].id = ; // set ID to ID
value[0].name = "new_name"; //set name to name
value[0].entityType = "sender"; //optional
formContext.getAttribute("sender").setValue(value);

}

I also tried the solution below it doesn't work.

function PopulateFromLookUpField(executionContext) {


 var lookUpObject.id = ;
   lookUpObject.name = "Joe CRM";
   lookUpObject.entityType = "sender";               
   formContext.getAttribute("sender").setValue(value);
   
}

Please advise and help.