Maoqin Xie

I have embedded the code on my website and it worked as expected. But I am wondering pre-fill the pre-chat form if the user logged in. What should I do? The below code is not working in react js. 

<script type="text/javascript">
zESettings = {
  webWidget: {
    contactForm: {
      fields: [
        { id: 'description', prefill: { '*': 'This is prefilled description text' } }
      ]
    }
  }
};
</script>