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function myFunc(selection, textBox) {  
  var boxID = textBox.id; 
  alert(boxID)
}

myFunc;  

Note: If the textbox has the float placeholder property enabled, the DOM structure of the textbox widget is altered, in that the textbox's <input> element is wrapped in a <div> element, which then adopts the widget's id. In this case, the onselect event handler could be written like in Example 3, below.

Example 3: (Same as Example 2, but supports widgets using floating placeholders)

function myFunc(selection, textBox) {
  var boxID;
  if (textBox.classList.contains("pui-floating-placeholder-input")) boxID = textBox.parentElement.id; // If floating placeholder exists, get the id from the parent div
  else boxID = textBox.id;
  
  alert(boxID);
}
 
myFunc;