JavaScript toUpperCase() method

Part of the String object, toUpperCase() is applied on a piece of text, and returns a copy converted to all-caps. The method ignores whitespace, numbers, symbols, and letters already capitalized: var str = "I learn JavaScript"; alert( str.toUpperCase() +"\n" + str ); // ⇑ Show returned string, and original variable on second line
As you can tell from running the code above, the original string remains unaffected; to actually convert a string's casing, assign the returned value to the variable, like this: var str = "I learn JavaScript"; str = str.toUpperCase(); // Original string now capitalized! alert( str );
You can style your text to appear in capital letters, using the CSS text-transform property: .capitalized { text-transform:uppercase; }
Practical example - force a text field to appear (style) and be (script) capitalized: <input type="text" name="twoLetterState" style="text-transform:uppercase" onchange="this.value=this.value.toUpperCase()" >
The PHP equivalent to JavaScript's toUpperCase() method is the strtoupper() function: $twoLetterState = strtoupper( $twoLetterState );
Sister / opposite method: use toLowerCase() to get a copy of a string converted to minuscules.

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