I have my java script in angular checking if the value of text field is undefined or empty, it is fine and working,

$scope.checkNumber = function(user_answer){
	if(user_answer == undefined){
	  return false;					
	}
}

I have my java script in angular checking if the value of text field is undefined or empty, it is fine and working,

$scope.checkNumber = function(user_answer){
	if(user_answer == undefined){
	  return false;					
	}
}

But my next step is how I can make a function to identify if the value has a string or a number and return a boolean. I don't know the right syntax for angular java script, can anyone help me to solve my problem?

• javascript
• angularjs

• have you tried typeof , its inbuilt into JS – Sushant Commented Jun 25, 2015 at 5:21
• if you want to have a number only textfield, use <input type='number'> – Icycool Commented Jun 25, 2015 at 5:38
• @lcycool <input type='number'> doesn't prevent you from inputting strings – Robin-Hoodie Commented Jun 25, 2015 at 5:59

2 Answers 2

You can do this the angular way, using the angular helper functions:

$scope.checkNumber = function(user_answer){
    if(angular.isUndefined(user_answer)){
      return false;                 
    }
    if(angular.isString(user_answer)) {
       //return boolean
    }
    if(angular.isNumber(user_answer)) {
       //return boolean
    }
}

Try like this

function check(text){     
 return typeof text ==="number";
}