Parse airtable link and put source attribute to it

parseAirtableLinks.js

// put it to <header></header> inside <script></script> tag

// make sure we run it once the page loads
window.addEventListener('load', parseAirtableLinks)


function parseAirtableLinks() {
  console.log('Parse links started...')

  let urlParams = new URLSearchParams(window.location.search);
  let leadSource = urlParams.get('source');

  if (!leadSource) {
    leadSource = "unknown";
  }

  let links = document.getElementsByTagName("a");
  for (let i = 0; i < links.length; i++) {
    let link = links[i];
    let href = link.getAttribute("href");
    if (href.indexOf("source") === -1 && href.indexOf("airtable") !== -1) {
      // inserting correct link per Airtable documentation
      // https://support.airtable.com/docs/prefilling-a-form#h_01FMTKA71EF8EPG3S7P1K7704V
      // 1) We prefill the form
      // 2) We make sure it's hidden
      link.setAttribute("href", href + "?prefill_Source=" + leadSource + "&hide_Source=true");
    }
  }
}