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Edit File: gforms_hooks.js

//----------------------------------------------------------
//------ JAVASCRIPT HOOK FUNCTIONS FOR GRAVITY FORMS -------
//----------------------------------------------------------

if ( ! gform ) {
	document.addEventListener( 'gform_main_scripts_loaded', function() { gform.scriptsLoaded = true; } );
	window.addEventListener( 'DOMContentLoaded', function() { gform.domLoaded = true; } );

gform.hooks[hookType][action].push( { tag:tag, callable:callable, priority:priority } );
		},
		doHook: function( hookType, action, args ) {

// splice args from object into array and remove first index which is the hook name
			args = Array.prototype.slice.call(args, 1);

if ( undefined != gform.hooks[hookType][action] ) {
				var hooks = gform.hooks[hookType][action], hook;
				//sort by priority
				hooks.sort(function(a,b){return a["priority"]-b["priority"]});

hooks.forEach( function( hookItem ) {
					hook = hookItem.callable;

if(typeof hook != 'function')
						hook = window[hook];
					if ( 'action' == hookType ) {
						hook.apply(null, args);
					} else {
						args[0] = hook.apply(null, args);
					}
				} );
			}
			if ( 'filter'==hookType ) {
				return args[0];
			}
		},
		removeHook: function( hookType, action, priority, tag ) {
			if ( undefined != gform.hooks[hookType][action] ) {
				var hooks = gform.hooks[hookType][action];
				hooks = hooks.filter( function(hook, index, arr) {
					var removeHook = (undefined==tag||tag==hook.tag) && (undefined==priority||priority==hook.priority);
					return !removeHook;
				} );
				gform.hooks[hookType][action] = hooks;
			}
		}
	};
}