How to – use Dynamics 365 Marketing JavaScript API to set hidden field’s value

Dynamics Marketing JavaScript API is only available for the marketing form hosted as Script. It is not available for forms hosted as Iframe.

More on embedding form on external page –

Add a reference to form-loader.js or load.js to access the API.

Below is our form with a hidden field in it.

Based on the current living situation (drop down), we want to set the value of the Financially Capable field (bool) – the hidden field’s value as either True or False.

For this, we have added the below script, in the formSubmit event.

formSubmit triggers on form submit before the form submission is sent to the server.

Check all the events here –

The script – Get the id of the element through browser’s developer tools.

Hope it helps..

  // Extending Marketing form with code 
        // formSubmit - Triggers on form submit before the form submission is sent to the server.
        MsCrmMkt.MsCrmFormLoader.on('formSubmit', function (event) {
            // get the id of the elements through developer tools of the browser
            // based on selected current living situation (optionset)
            if (document.getElementById('deb110aa-e266-ed11-9561-000d3ae090c0') != null) {
                var selectedCurrentLivingValue = document.getElementById('deb110aa-e266-ed11-9561-000d3ae090c0').value;
                if (selectedCurrentLivingValue == 881990000) {
                    // set the value of Financially Capable field (boolean)- true / false
                    document.getElementById('dcc46e64-2867-ed11-9561-000d3ae090c0').value = "1";
                else {
                    document.getElementById('dcc46e64-2867-ed11-9561-000d3ae090c0').value = "0";

Author: Nishant Rana

I love working in and sharing everything about Microsoft.NET technology !

3 thoughts on “How to – use Dynamics 365 Marketing JavaScript API to set hidden field’s value”

Please share your thoughts

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.


Sharing my knowledge and experience about the Microsoft Power Platform.

Arpit Power Guide

a guide to powering up community

Welcome to the Blog & Website of Paul Andrew

Technical Leadership Centred Around the Microsoft Data Platform

Deriving Dynamics 365

Deriving Solutions and features on Power Platform/Dynamics 365

The CRM Ninja

Thoughts & musings from a Dynamics 365 Ninja!

D CRM Explorer

Learn about Microsoft Dynamics CRM Power Platform customization and implementation and other cool stuffs

Stroke // Jonas Rapp

I know pre-stroke. I will improve who I was.

Power Melange

Power Melange By Shalinee

Clavin's Blog

Power Automate - Power Apps - SharePoint Online - Azure - Nintex - K2 - Artificial Intelligence

Sat Sangha Salon

An Inquiry in Being

The Indoencers

The Influencers & Influences of Indian Music

Monika Halan's blog

Hand's-free money management

D365 Demystified

A closer look at Microsoft Dynamics 365.

Microsoft Mate (msftmate) - Andrew Rogers

Experienced consultant primarily focused on Microsoft Dynamics 365 and the Power Platform


Specific topics by Django Lohn on the whole Microsoft365 Stack

Manmit Rahevar's Blog

One Stop Destination for Microsoft Technology Solutions


Naturally Curious

Brian Illand

Power Platform and Dynamics 365

Steve Mordue MVP

A Microsoft Business Applications MVP

Subwoofer 101

Bass defines your home theater

SQLTwins by Nakul Vachhrajani

SQL Server tips and experiences dedicated to my twin daughters.

Everything D365

Discovering Azure DevOps and D365 Business Applications

Tech Wizard

Lets do IT Spells

XRM Tricks (Power Platform & Dynamics CRM )

Power Platform & Dynamics CRM


Mail to for queries and suggestions

Giving back to the community what I have learned

xrm CRM Dynamics

Dynamics CRM Technical & Functional Info

Dynamics 365 Blogs - Explained in unique way

Sometimes you need to look at things from different perspective.

CRM Keeper

Dynamics 365 Customer Engagement, CRM, Microsoft CRM, Dynamics CRM


Step into the world of a Dynamics 365 Consultant

Dianamics PCF Lady

Diana & Dynamics 365 & Power Platform

Sara Lagerquist

No Code Customization Concepts

%d bloggers like this: