parseInt Function (JavaScript)

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Returns an integer converted from a string.

parseInt(numString, [radix])

Arguments

numString: Required. A string to convert into a number.
radix: Optional. A value between 2 and 36 indicating the base of the number contained in numString. If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal. All other strings are considered decimal.

Remarks

The parseInt function returns an integer value equal to the number contained in numString. If no prefix of numString can be successfully parsed into an integer, NaN (not a number) is returned.

JavaScript

parseInt("abc")     // Returns NaN.
parseInt("12abc")   // Returns 12.

You can test for NaN using the isNaN function.

Requirements

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards. See Version Information.

Applies To: Global Object (JavaScript)

Note
Starting in Internet Explorer 9 standards mode, the parseInt function does not treat a string that has a prefix of '0' as octal. When you are not using the parseInt function, however, strings with a prefix of '0' can still be interpreted as octal. See Data Types (JavaScript) for information about octal integers.

Reference

isNaN Function (JavaScript)

parseFloat Function (JavaScript)

String Object (JavaScript)

valueOf Method (JavaScript)