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Auto-fill form values based on URL querystring


Auto-fill form values based on URL querystring

An example of how this could be used is if you want to personalize the URL for each customer, to auto-fill their name and email like survey forms.

Now, you can have special URLs that auto-fill form values like this:

This is the original form without values in the URL:


1) Paste this in Project Dashboard > Custom Code > Footer Code:

function getParam(name) { name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]"); var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"), results = regex.exec(; return results === null ? "" : decodeURIComponent(results[1].replace(/\+/g, " ")); }
Webflow.push(function() {

  // Auto-populate form fields (text fields only) based on query string
  // For non-text fields like dropdown/radio/checkbox, please contact me for custom development (
  $('input:text, input[type=email]').each(function() {
    var paramValue = getParam(;
    if(this.value == "" && paramValue != "") this.value = paramValue;


2) How to set up the URL?

Just put a question mark ? after the URL, followed by key=value pair (separated by & if more than one Key-Value pair). Any “scroll-to” IDs including the hash symbol #my-form, has to be moved to the end of the URL.

The key will be the ID of the form field (case-sensitive), value will be whatever you want it to be. For special characters that are illegal in URLs like spaces, @, etc., you have to substitute them for codes.

A simple way to ensure the value is URL-friendly, is to open the browser console, then type this:


Then use the result (excluding the quotes) as the value:


Here is a list of common symbols that you can’t use in URLs, and their encoded substitute:

(space)   %20
@         %40
+         %2B
?         %3F
#         %23

2.1) How to open the browser console?

Also, feel free to contact me for further code help and/or customization of third-party plugins

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Hello @samliew

I was looking for something exactly like that! Is there anyway to apply the values on the special URL to a specific text element inside the page instead of form values?

Thanks in advance.


Of course. JavaScript can do a lot of things.