initialValue attribute directive for angular

initial-value.js

/** Get and Render initial value from HTML attr (data from BackEnd)
 * license: MIT
 */

angular.module('bra.global.directive')
	.directive('initialValue', ['$parse', function($parse) {
		'use strict';

		//trim input values (eg. textareas)
		var removeIndent = function (str) {
			if(!str || typeof str !== 'string'){
				return str
			}

			var lineStrings = str.split('\n');
			var newLineStrings = [];

			lineStrings.forEach(function (it, i) {
				var trimmedLine = it.replace(/(^\s+|\s+$)/g,'');

				if(trimmedLine){
					newLineStrings.push(trimmedLine)
				}
			});

			return newLineStrings.join('\n');
		};

		return {
			restrict : 'A',
			require: 'ngModel',
			link: function(scope, element, attrs, modelCtrl) {
				var currentValue = $parse(attrs.ngModel)(scope);
				var initialMarkupValue = element[0].value || attrs.value || attrs.initialValue;
				var newValue;

				if(initialMarkupValue && currentValue === undefined && currentValue != initialMarkupValue){
					newValue = removeIndent(initialMarkupValue);

					// update the model
					modelCtrl.$setViewValue( newValue );
					// update the view
					modelCtrl.$render();
				}
			}
		};
	}]);