Get formContext in HTML Webresource in Dynamics 365

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If you are using on the latest version of Dynamics 365/ CDS online, Microsoft API can you help you do that. A better and supported approach is described here.

Xrm.Page is deprecated. We all know and we have already started revamping our form scripts and replacing Xrm.Page with formContext and gridContext as suggested by Microsoft.


But the ordeal does not end here. And recently I was faced with another challenge. Customers had HTML webresources embedded in their form where they are playing with the form controls using parent.Xrm.Page.getAttribute and parent.Xrm.Page.getControl.

So we thought of removing Xrm.Page from within inline HTML webresources as well. But wait, there is a problem here. How do we get formContext here.


Searched the heck out in Microsoft Docs but could not find a way. Came across this documentation in Microsoft Docs which I think everybody know anyways. It still asks to use parent.Xrm.Page. But our customer wanted to remove all traces of Xrm.Page at one go.


Then how to proceed. First things first. Is there a way to access the formContext inside HTML webresources?

I could not find any. But I believe you can solve so many things by a good design. And I implemented one of it here to solve the problem. My customer liked it and I hope you would like it too.


So I have this custom entity inside which contains a HTML webresource embedded within it. The first thing I did is to store the formContext in a global variable. So I registered a library on form onload of the test entity. Below is the code for the same. I am using namespaces here for better coding convention

// JavaScript source code
if (typeof (ibtrng) == “undefined”) {
    ibtrng = { __namespace: true };

ibtrng.formevents = {
    fContext: null,

    onload: function (e) {
         var fContext = e.getFormContext();

Xrm.getParentAttribute = function (attrName) {
            return fContext.getAttribute(attrName);

        Xrm.getParentControl = function (attrName) {
            return fContext.getControl(attrName);




The code highlighted in yellow just sets the formContext in a global variable.

Check for the code highlighted in green! What am I doing here? Well from the screenshot of Microsoft Docs, it is evident that within the embedded HTML page you can get hold of the Xrm context using parent.Xrm.

So in the parent scope, during from onload, I registered two custom functions in Xrm namespace – getParentAttribute and getParentControl which is internally using the formContext only.

You can define as many custom functions as you want in the parent scope of Xrm namespace.


And now when the HTML page loads, I can get access to the form data. For the sake of this demo I just populate the textbox field on my HTML with the data of the form. Below is the code on load of my HTML Page

function onHtmlPageLoad() {

            var attrName = parent.Xrm.getParentAttribute(“ibtrng_name”);
            var attrValue = attrName.getValue();

            document.getElementById(“txtName”).value = attrValue;



And voila! I can access data without even any trace of Xrm.Page.

Now the bigger challenge – Does it work on UCI? No solution is complete these days if it does not work on UCI.

Works like a charm in UCI too!


Hope you liked it!

Debajit Dutta

(Dynamics MVP)

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7 thoughts on “Get formContext in HTML Webresource in Dynamics 365”

  1. How can you be sure that WebResource is loaded after onLoad event has fired? There is no documentation that you can take that for granted so for me your approach is much more problematic and error prone compared to using Xrm.Page on web resources (just like documentation states)

    1. Thanks for reading.
      Here is the thing. There is no guarantee. But Definitely in the form onload script, we can get access to webresource control. And then do a setSrc dynamically. i think there is a guarantee that it works now!

      And coming to keeping Xrm.Page, even after Microsoft recommendations customer can be really adamant in doing their ways. And no matter how much we recommend, at the end of day it is like this sometimes where we need to pay heed to customer requirements.

      For my customer the idea of keeping it and later work on it when we have a solution was totally not acceptable. So no other way unfortunately 🙂

  2. Hello Debajit, Thanks for the article. I have following question with regards to Dynamics 365 :

    How do we replace window.parent.Xrm.Page.getAttribute that is written in js file.


  3. Hello Debajit, Thanks for the article.

    I have tried the code but it’s not working for me. I have one ribbon button on the Account form, on click of the button, I’m opening a web resource with open-webresource method.

    I need a form context of the Account form on the web resource.

    Can you please help me with the above?

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