if statement - if else condition in angularjs to compare string and int value -

i want check if both font , fontsize undefined sent client side.when user not select font or font size, pass value undefined. these conditions work when 1 of them (font or font size) undefined, when both of them undefined, recieve error,

typeerror: cannot read property 'font' of undefined     @ scope.stylesctrl.$scope.addstyles (http://0.0.0.0:8080/app/edit/styles/stylesctrl.js:26:38)     @ fn (eval @ <anonymous> (http://0.0.0.0:8080/bower_components/angular/angular.js:13231:15), <anonymous>:4:317)     @ ngeventdirectives.(anonymous function).compile.element.on.callback (http://0.0.0.0:8080/bower_components/angular/angular.js:23411:17)     @ scope.$get.scope.$eval (http://0.0.0.0:8080/bower_components/angular/angular.js:15916:28)     @ scope.$get.scope.$apply (http://0.0.0.0:8080/bower_components/angular/angular.js:16016:25)     @ htmlinputelement.<anonymous> (http://0.0.0.0:8080/bower_components/angular/angular.js:23416:23)     @ htmlinputelement.jquery.event.dispatch (http://0.0.0.0:8080/bower_components/jquery/dist/jquery.js:4435:9)     @ htmlinputelement.jquery.event.add.elemdata.handle (http://0.0.0.0:8080/bower_components/jquery/dist/jquery.js:4121:28) undefined 

below if else conditions in server side,

if(font == undefined && fontsize == undefined){ //doesn't work         console.log("font");         updatefile(main, [             {rule: ".made-easy-themecolor", target: "color", replacer: color}         ], function (err) {             console.log((err));         });     }      else if(font == undefined){ //work         updatefile(main, [             {rule: ".made-easy-themecolor", target: "color", replacer: color},             {rule: ".made-easy-themefontsize", target: "font-size", replacer: fontsize + "em"}         ], function (err) {             console.log((err));         });     }     else if(fontsize == undefined){ //work         updatefile(main, [             {rule: ".made-easy-themecolor", target: "color", replacer: color},             {rule: ".made-easy-themefont", target: "font-family", replacer: font}         ], function (err) {             console.log((err));         });     }      else{ //work         updatefile(main, [             {rule: ".made-easy-themecolor", target: "color", replacer: color},             {rule: ".made-easy-themefont", target: "font-family", replacer: font},             {rule: ".made-easy-themefontsize", target: "font-size", replacer: fontsize + "em"}         ], function (err) {             console.log((err));         });      } 

this html code in front end

 <h3 ng-style="{'font-family': styles.textsize.font, 'font-size': styles.textsize.size + 'px'}">text is</h3> 

this controller send data server

$scope.addstyles = function(styles) {             $scope.fontdata = {                 appid: "55c0ace94aa248735d75b140",                 header: styles.uploadme,                 color: styles.mycolor,                 font: styles.textsize.font,                 fontsize: styles.textsize.size             };                 stylesservice.editstyles($scope.fontdata)                     .success(function (res) {                         console.log("success");                     })         }; 

is there problem if else statements? or because comparing string value(font) , int value(fontsize)?

the problem you're not initializing model objects on $scope. has nothing w/your server side if/else... @hrishi points out, it's javascript error :)

to fix it, need initialize object styles.textsize on scope.

the reason angular (ng-model?) create object when user types 1 of inputs. when user doesn't type anything, styles.textsize never gets defined.

just guessing here, b/c can't see template or rest of code in controller, fix this:

$scope.styles = {   textsize: {   } };