Introduction:
In Dynamics 365 CRM, at times we must show or hide form header,header command bar,header body,Header tab navigator for a selected entity. This can be achieved by using client API Reference. As an example, contact record was taken to show this functionality.
Step 1:
Login to the required environment and select required solution [Contact Customizations Solution in this case] as shown in the below figure.

Step 2:
After Step 1, select contact web resource in solution and click on Edit as shown in the below figure.

Step 3:
After Step 2, open any contact record and understand Header Command Bar,Header Body,Tab Navigator as shown in the below figure

Step 4:
After Step 3, write the below code for show header Command bar
formContext.ui.headerSection.setCommandBarVisible(true);
As shown in the below figure

Step 5:
After Step 4, write the below code for show header body
formContext.ui.headerSection.setBodyVisible(true);
As shown in the below figure

Step 6:
After Step 5, now to show header tab navigator use the below code
formContext.ui.headerSection.setTabNavigatorVisible(true);
As shown in the below code

Step 7:
After Step 6, collectively use the below code on the onload function to show header command bar, header body, tab navigator
ContosoVaccination.Scripts.ContactForm =
{
handleOnLoad: function (executionContext)
{
console.log(‘on load – contact form’);
hideHeaderCommandBar(executionContext);
hideHeaderBody(executionContext);
hideTabNavigator(executionContext);
},
__namespace: true
}
function hideHeaderCommandBar(executionContext)
{
let formContext = executionContext.getFormContext();
if (formContext !== null && formContext != ‘undefined’)
{
formContext.ui.headerSection.setCommandBarVisible(true);
}
}
function hideHeaderBody(executionContext)
{
let formContext = executionContext.getFormContext();
if (formContext !== null && formContext != ‘undefined’)
{
formContext.ui.headerSection.setBodyVisible(true);
}
}
function hideTabNavigator(executionContext)
{
let formContext = executionContext.getFormContext();
if (formContext !== null && formContext != ‘undefined’)
{
formContext.ui.headerSection.setTabNavigatorVisible(true);
}
}
As shown in the below figure

Step 8:
After Step 7, now save and publish the Webresource and open a contact record and observe as shown in the below figure

Note:
- Make sure to publish all customizations and upload JavaScript (js) file.
- To hide header command bar, header body,header tab navigator then to the respective method pass false
- ex : To Hide header command bar use the following code formContext.ui.headerSection.setCommandBarVisible(false);
- Contact Form on load event should be registered as an event handler after creation / updation of the new/existing Webresource of type js.
- To show as an example, I have used same function names for both showing and hiding. In short to show you must pass true and to hide you must pass false.
- Microsoft documentation found here.
Conclusion: In this way, one can easily show and hide header related components of crm form with Webresource using Client API Reference using custom code with web resource in Dynamics 365 CRM.
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