toUpperCase Method (String) (JavaScript)

1 minutes to read Contributors
  • Mike Jones
  • Saisang Cai

Converts all the alphabetic characters in a string to uppercase.

Syntax


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

Remarks

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

Example

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.

Requirements

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

See Also

toLocaleUpperCase Method (String)
toLowerCase Method