Is it possible to access a value from a script with a function?

Question

I need to save the email from this script:

<script>
  window.renderOptIn = function() {
    window.gapi.load('surveyoptin', function() {
      window.gapi.surveyoptin.render(
        {
          "merchant_id": 0000,
          "order_id": "100101205",
          "email": "tester@example.com",
          "delivery_country": "XX",
          "estimated_delivery_date": "2021-09-03"
        });
    });
  }
</script>

Is there a way to do that? It's physically in the code but I can't think of a way to get it.

Context:

It's e-commerce related. The script is on the "thank-you" page. I need to save the email to a variable so I can use it for google's enhanced conversion tracking.

Answer 1

Accessing the document.scripts and filtering on content

Regular expression or split.

const code = [...document.scripts].filter(script => script.textContent.includes('surveyoptin'))
const match = code[0].textContent.match(/(?:render\(.*\s+)({.*\s+)+/s)
const str = match[1].split(");")[0]; // forgot how to ignore trailing stuff after the group: );
console.log(str)
const obj = JSON.parse(str); // fails on 0000
console.log(obj.email)

// alternative - this is inflexible on spacing etc:

console.log(
  code[0]
  .textContent
  .split('"email": "')[1]
  .split('"')[0]
)

<script src="x.js"></script>
<script>const survey = "Survey"; // dummy script</script>
<script>
  window.renderOptIn = function() {
    window.gapi.load('surveyoptin', function() {
      window.gapi.surveyoptin.render(
        {
          "merchant_id": "0000",
          "order_id": "100101205",
          "email": "tester@example.com",
          "delivery_country": "XX",
          "estimated_delivery_date": "2021-09-03"
        });
    });
  }
</script>