Javascript add +1 to string [duplicate]

Question

I have a variable that stores a innerHTML text in it

var text = document.getElementById("textID").innerHTML; // <-- textID is actually a number

The "text" is actually just a number but I guess javascript still thinks it's a string.

I want to add + 1 to the variable text, but it just adds a new letter instead of increasing the number

For example : 0 + 1 = 01 --> 01 + 1 = 011 and so on...

Here's the code I tried this with:

text = text + 1;

How can I make it so it increases the number instead of adding new letters? (1+1 = 2, etc)

Griffith · Accepted Answer · 2015-11-03 15:39:17Z

30

Under the assumption that you are absolutely sure that the number is a decimal integer. Either

text = +text + 1;

Or

text = parseInt(text, 10) + 1;

Or

text = Number(text) + 1;

answered Nov 3, 2015 at 15:39

Griffith

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1 Comment

text = (parseInt(this.text) + 1).toString(); or text = String(parseInt(this.text) + 1)