I am using the below code to add integer and float value using JavaScript. But I can't do this, it returns NaN. I am new to development. Please help me to solve this.

lbl_bal_total.value = Numbers(lbl_bal_total.innerHTML) + Numbers(lbl_bal_others.value);
//lbl_bal_total.value = 1568 + .25; // Error lbl_bal_total value is NaN
lbl_bal_total.innerHTML = Math.round(lbl_bal_total.value);

I am using the below code to add integer and float value using JavaScript. But I can't do this, it returns NaN. I am new to development. Please help me to solve this.

lbl_bal_total.value = Numbers(lbl_bal_total.innerHTML) + Numbers(lbl_bal_others.value);
//lbl_bal_total.value = 1568 + .25; // Error lbl_bal_total value is NaN
lbl_bal_total.innerHTML = Math.round(lbl_bal_total.value);

• javascript
• jquery
• floating-point
• integer

• Is this your actual code? What is Numbers? – Blender Commented Feb 28, 2013 at 5:08
• 1 Also the Number() function will return NAN if the arguments value cannot be converted to a number. Are you sure lbl_bal_total.innerHTML is always numerical characters. developer.mozilla/en-US/docs/JavaScript/Reference/… – Jesse Lee Commented Feb 28, 2013 at 5:24

4 Answers 4

Try this:

lbl_bal_total.innerHTML = Math.round(parseFloat(lbl_bal_total.innerHTML) + parseFloat(lbl_bal_others.value));

Try this. Data type is Number not Numbers

 lbl_bal_total.value = Number(lbl_bal_total.innerHTML) + Number(lbl_bal_others.value);
    //lbl_bal_total.value = 1568 + .25; // Error lbl_bal_total value is NaN
    lbl_bal_total.innerHTML = Math.round(lbl_bal_total.value);

if you are not sure about the values of lbl_bal_total.innerHTML and lbl_bal_others.value then you can check it using isNaN

var num = parseFloat(lbl_bal_total.innerHTML) + parseFloat(lbl_bal_others.value);
lbl_bal_total.innerHTML = Math.round(num);

lbl_bal_total.value = parseFloat(lbl_bal_total.innerHTML) + parseFloat(lbl_bal_others.value);
//lbl_bal_total.value = 1568 + .25; // Error lbl_bal_total value is NaN
lbl_bal_total.innerHTML = parseFloat(lbl_bal_total.value);