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Iframe Integration

Hi there,

since a couple of days the code for the iframe integration seems to be buggy.

I use:

<script>
    window.addEventListener('message', function(e) {
      var iframe = document.querySelector('#personio-iframe');
      var eventName = e.data[0];
      var data = e.data[1];
      switch(eventName) {
        case 'setHeight':
          iframe.style.height = data + 'px';
          break;
      }
    }, false);
</script>

If I remove the ID which leads to the script it works. But by using the id nothing is shown!

Can anybody provide a solution?

Thanks