Custom record view controller for displaying an alert upon a record being accessed, if it meets a given criteria.

record.js

({
	/* File: ./custom/modules/Leads/clients/base/views/record/record.js */

    extendsFrom: 'RecordView',

    initialize: function(options) {
        this._super('initialize', [options]);
        this.model.on('data:sync:complete', this.showAlert, this);
    },

    showAlert: function(){
    	var currentStatus = this.model.get('status');
    	
    	if (currentStatus === 'Converted')
    	{
    		app.alert.show('ConvertedLead', {
    			level: 'warning', 
    			title: app.lang.get('LBL_ALERT_TITLE', this.module), 
    			messages: app.lang.get('LBL_ALERT_MESSAGE', this.module),
    			autoClose: false
    		});
    	}
    }
  
})

The example in this controller will display the Alert if Status equals Converted on the selected Lead record. Note that it requires the definition of the labels LBL_ALERT_TITLE and LBL_ALERT_MESSAGE in the module's language file.