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toUpperCase Method (String) (JavaScript)

Converts all the alphabetic characters in a string to uppercase.

strVariable.toUpperCase()
"String Literal".toUpperCase() 

The toUpperCase method has no effect on non-alphabetic characters.

The following example demonstrates the effects of the toUpperCase method:

var str1 = "This is a STRING.";
var str2 = str1.toUpperCase();
document.write(str2);

// Output: THIS IS A STRING.

Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards, Internet Explorer 11 standards. Also supported in Store apps (Windows 8 and Windows Phone 8.1). See Version Information.

Applies To: String Object (JavaScript)

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