Dynamically Add a Button in User Event Scripts

Duration: 5 minutes

Important Note:
This is only an example; please change the name, title, id and deployment of the scripts based on business requirement

Script Deployment and Installation:

Navigate to Setup > Customization > Scripting > Scripts > New > User Event
     > Name = Add Button
     > ID = customscript_add_button
     > Script File = <Javascript file uploaded>
     > Before Load Function = beforeLoad_addButton
     Click Save & Deploy
     
   On the deployment page
     > Title = Add Button Deployment
     > ID = customdeploy_add_button
     > Applies To = Employee
     > Execute as Admin = checked
     > Roles = check select all
     Click Save


function beforeLoad_addButton(type, form) {
   // The second parameter of the event it will return the current form of the record
   form.setScript('customscript_add_button'); // sets the script on the client side
   form.addButton('custpage_buttonalert', 'Alert', 'onclick_callAlert()'); 
   // addButton(name, label, script)
   
   // name - The internal ID name of the button. The internal ID must be in lowercase, 
   // contain no spaces, and include the prefix custpage if you are adding the button to
   // an existing page. For example, if you add a button that appears as Update Order, 
   // the button internal ID should be something similar to custpage_updateorder. 
   // ID must start with custpage
   
   // label - the display text of the button
   
   // script - assign the function of the script to be executed
   // There are a couple of options on how to set the script with the function to be called
   // 1. Assign the ID of a deployed script 
   // 2. Deploy a Client Side Script onto the record      
    
}

Create this function and deploy this as a script any type but ideally as a Client Side Script, in this scenario the script is also deployed within the User Event Script just to show it can be also set with a user event script

function onclick_callAlert(){
alert('This is the new button!');
// do other logic here
}

     Note: The button only execute scripts supported on the Client Side

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