How to convert string to integer in JavaScript

parseInt, parseFloat, Number Function or unary operator

[sawkat]

function tipp(){
var a= document.getElementById("textbox1").value;
var b= document.getElementById("textbox2").value;
var c= a+b;
myform.total.value = c;
}
now if i put in the textbox1 and textbox1 , like --
a= 5 and b = 3
that shold be c = 8
but comming 58
so now i need a+b = 8 , how can i do ?

[rocknbil]

Try: var c = parseInt(a+b);

[sawkat]

no - not working

[Lang]

Try var c = parseFloat(a) + parseFloat(b);

[sawkat]

yesssss thanks Lang
thanks for help

[coopster]

Welcome to WebmasterWorld, sawkat.

JavaScript is recognizing the types of variables here as string and rather than use a mathematical addition calculation, JavaScript is using string concatenation to combine the two strings.

JavaScript has a few built-in functions for handling conversion of strings to numbers including

parseInt

and

parseFloat

for integers and floats. There is also a

Number()

function. You might also consider the unary plus operator. Fast and easy:

function tipp() 
{ 
  var a = +document.getElementById("textbox1").value; 
  var b = +document.getElementById("textbox2").value; 
  var c = a + b; 
  myform.total.value = c; 
}

[Fotiman]

Personally, I like the parseInt method, simply because it's more obvious what is happening.

function tipp() { 
  var a = parseInt(document.getElementById("textbox1").value); 
  var b = parseInt(document.getElementById("textbox2").value); 
  var c = a + b; 
  myform.total.value = c;  
}