An Js file for SharePoint for speedy development

SPTrick.js

if (typeof console == "undefined") {  this.console = {log: function() {}}; }//If browser doesn't support console.log

//OTO = One Time Object
var rClientContext;//A context OTO used everywhere
var rWeb;//A web OTO used
var rCurrentUser;// A user OTO

$(document).ready(function(){
	rClientContext = SP.ClientContext.get_current();
	rWeb = rClientContext.get_web();
	rCurrentUser = rWeb.get_currentUser();	
});


var extension = {
	//Get The Field input Control by FieldName of List/Library
  GetFieldControl: function(fieldName) {
  	var ctrl = $.GetFieldControls(fieldName)
  	if (ctrl.length > 1){
  		$.each(ctrl, function(i,v){
	  		//console.log(v);
  			if (v.nodeName == "SELECT" || v.nodeName == "INPUT"){
	  			ctrl = $(ctrl[i]);
	  			//console.log(ctrl);
	  			return;
	  		}
  		});
  	}
  	return ctrl;
  },
  
  GetFieldControls: function(fieldName) {
  	var ctrl = $("[title='"+fieldName+"']");
  	if (ctrl.length< 1){
 		ctrl = $("[ID^='"+fieldName+"']");//Start With
  	}
  	if (ctrl.length < 1){  		
  		ctrl = $("[title~='"+fieldName+"']");//Word in it
  	}
  	if (ctrl.length< 1){
 		ctrl = $("[title*='"+fieldName+"']");
  	}

    return ctrl;
  },

  
	//Set The Value for People Picker Control by email address
  SetValueForPeoplPicker: function(fieldName,email){
	var d = $.Deferred();
  	var requestorCtrl = $.GetFieldControl("Requestor")
   	
   	var peoplePickerDiv = requestorCtrl[0]; 
    var peoplePickerEditor = $(requestorCtrl[1]);
    
    SP.SOD.executeFunc('clientpeoplepicker.js', 'SPClientPeoplePicker', function () {
	    var spPeoplePicker = SPClientPeoplePicker.SPClientPeoplePickerDict[peoplePickerDiv.id];
	    peoplePickerEditor.val(email);
	
	    spPeoplePicker.AddUnresolvedUserFromEditor(true);
	    d.resolve();

    });
    return d.promise();

  },
  
	//A utility function returns Email from Login Name
  GetEmailFromLoginName: function(loginName){
  	var temp1 = loginName.split('|')
    var currentUserEmail = temp1[temp1.length-1];
    return currentUserEmail;
  }
  
};

$.extend(extension);

function log(txt){
	console.log(txt);
}

//A utility function to Disable Field if not empty
function DisableFieldIfFilled(fieldName){
	var field = $.GetFieldControl(fieldName);
	if (field.val()){
		field.attr("disabled","disabled");
	}
}

//A utility function to disable field
function DisableField(fieldName){
	var field = $.GetFieldControl(fieldName);
	field.attr("disabled","disabled");
}