Capture response with Javascript

I manage to do it. Here is an example. Thank you @TomG for the indication.

Capture text entry response and store it as embedded data.
```javascript
Qualtrics.SurveyEngine.addOnPageSubmit(function()
{

/* Get current question ID (e.g. 'QID10') */
var qid_01_str = this.questionId;
/* console log to check what ID was capture (you can comment this line)*/
console.log('Question is: QR~' + qid_01_str)

// Save the current question's response value QR~QID247~TEXT
var responseTextField = document.getElementById('QR~' + qid_01_str);
var currentResponse = responseTextField.value;

/* console log to see what was captured */
console.log('response text entry 1 is: ' + currentResponse_01)

/* Assign response to ED */
/* The following line creates (if it doesn't exist) or set (if already exist) an embedded data value */
Qualtrics.SurveyEngine.setEmbeddedData('ed_field_name', currentResponse)
});
```