Changing Text to Uppercase or Lowercase

You can change the case of the text entered in a custom field by writing this code in HTML Tag box in the custom field settings.

To convert entered text to Uppercase

 onChange="javascript:this.value=this.value.toUpperCase();"

To convert entered text to lowercase

 onChange="javascript:this.value=this.value.toLowerCase();"

The code gets executed as soon as the user enters a value and clicks anywhere outside the field (even without having to hit SAVE).