Trouble inserting text into HubSpot form field using JavaScript

Other Questions HubSpot
1

Hey everyone, I’m stuck with a HubSpot form on my webpage. I can’t seem to add text to a form field using JavaScript. Here’s what’s going on:

I’ve got this HubSpot form on my page, but when I try to put text in an input field with JavaScript, nothing happens. I’ve tried putting the script in the head tags, but then I get this error:

Uncaught TypeError: Cannot set property 'value' of null

I’m not sure what I’m doing wrong. Has anyone run into this before? Any ideas on how to fix it?

I’ve been messing with this for hours and I’m out of ideas. If you need more info, just let me know. Thanks for any help you can give!

2

I’ve been in your shoes, oliviac. The frustration is real when you’re battling with JavaScript and HubSpot forms. From my experience, the key is understanding HubSpot’s form lifecycle.

What worked for me was leveraging HubSpot’s form events API. Here’s a snippet that’s been my go-to:

window.addEventListener('message', function(event) {
  if (event.data.type === 'hsFormCallback' && event.data.eventName === 'onFormReady') {
    var form = document.querySelector('form.hs-form');
    if (form) {
      var input = form.querySelector('input[name="your_field_name"]');
      if (input) input.value = 'Your desired text';
    }
  }
});

This waits for HubSpot to signal that the form is ready before attempting to modify it. It’s been pretty bulletproof in my projects. Just make sure to replace ‘your_field_name’ with the actual name of your form field.

Also, don’t forget to place this script after your HubSpot form embed code. That way, you’re sure the HubSpot script has loaded before your code runs.

3

hey oliviac, have u tried using hubspot’s form api? it’s a game changer. here’s a quick fix:

hbspt.forms.create({
  onFormReady: function($form) {
    $form.find('input[name="email"]').val('[email protected]');
  }
});

this waits for the form to load before adding text. hope it helps!

4

hey oliviac, i had the same headache! trick is to wait for the form to load. try this:

document.addEventListener('DOMContentLoaded', function() {
  setTimeout(function() {
    document.querySelector('your-field-selector').value = 'your text';
  }, 1000);
});

gives the form time to show up. goodluck!

5

I’ve faced a similar issue with HubSpot forms and JavaScript. The problem is likely related to timing - your script is probably running before the form has fully loaded on the page.

To fix this, you could try wrapping your JavaScript in a window.onload function or using a MutationObserver to detect when the form is added to the DOM. Another approach is to use HubSpot’s form API instead of directly manipulating the DOM.

Here’s a snippet that worked for me:

window.addEventListener('message', function(event) {
    if (event.data.type === 'hsFormCallback' && event.data.eventName === 'onFormReady') {
        document.querySelector('input[name="email"]').value = '[email protected]';
    }
});

This listens for HubSpot’s form ready event and then populates the field. Remember to adjust the selector to match your specific form field. Hope this helps!

6

I’ve encountered this issue before when working with HubSpot forms. The problem often stems from the form not being fully loaded when your JavaScript tries to interact with it. A reliable solution I’ve found is using HubSpot’s form events API.

Here’s an approach that’s worked well for me:

window.addEventListener('message', function(event) {
  if (event.data.type === 'hsFormCallback' && event.data.eventName === 'onFormReady') {
    var form = event.data.id;
    var fieldToPopulate = document.querySelector('#' + form + ' input[name=\"yourFieldName\"]');
    if (fieldToPopulate) {
      fieldToPopulate.value = 'Your text here';
    }
  }
});

This code listens for HubSpot’s form ready event, ensuring your JavaScript only runs after the form is fully loaded. Remember to replace ‘yourFieldName’ with the actual name of your form field. This method has been quite reliable in my experience.