Javascript math issue - attribute value attribute

Question

i'm new in javascript code, i have simple question, i'm tryng to attribute new value to my input <input id="rimonta" type="text" />,

var p = listData.list[0].puntata; //  this return 10 
var x = p + 1  // i want have result 10+1 = 11 
$('#rimonta').val(x); // actually it attribute value 101 and NOT 11

I don't know why the math 10 + 1 return 101 and NOT 11. Thank you for your help!

because its coming back as a string, javascript is dynamically typed, not statically so it seens `p + 1` as `"10" + "1" = "101"` as a string. You need to cast listdata.list[0].puntata to an int with first — Alex, Dec 01 '16 at 23:23
`parseInt(p) + 1`, or `var p = parseInt(listData.list[0].puntata;` — Alex, Dec 01 '16 at 23:24
you can do it as var p = parsetInt(listData.list[0].puntata,10); var x = p + 1 $('#rimonta').val(x); — Geeky, Dec 01 '16 at 23:30

score 0 · Accepted Answer · answered Dec 01 '16 at 23:26

0

That is most likely due to the fact that p is a string

var p = "10";
var x = p + 1;
console.log(x) // returns 101

var p = 10;
var x = p + 1;
console.log(x) // returns 11

var p = "10";
var x = parseInt(p) + 1;
console.log(x) // returns 11

answered Dec 01 '16 at 23:26

Wei Yuan

94
11

yup! thank you for your help! – Diego Cespedes Dec 01 '16 at 23:37

Javascript math issue - attribute value attribute

1 Answers1