User:Saftzie/ui.tabinsert.js
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// insert tab for tab key event in edit areas
(function ( $ ) {
'use strict';
// keydown handler
function onKeydown( e ) {
var
s = this.selectionStart,
t = this.scrollTop,
v = this.value;
if ( e.key === 'Tab' ) {
e.preventDefault();
// insert a tab
this.value =
v.slice( 0, s ) + '\t' + v.slice( this.selectionEnd );
this.scrollTop = t;
this.selectionStart = this.selectionEnd = s + 1;
}
}
// attach keydown handler to edit textarea
$( '#wpTextbox1' )
.keydown( onKeydown );
}( jQuery ));