MediaWiki:Gadget-PrefixIndexHide.js

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if ( mw.config.get( 'wgCanonicalSpecialPageName' ) === 'Prefixindex' ) {
        var prefix = $( '#nsfrom' ).val();
        var hideprefixVal = mw.util.getParamValue( 'hideprefix' );
                // ^ Works only 1.17+
                // Replace with a call to a similar function or create one if you're using 1.16 or lower
        var $hideprefixLabel = $( '<label/>', {
                        'for': 'hideprefix',
                        'text': 'Hide prefix:'
        } );
        var $hideprefixInput = $( '<input/>', {
                'type': 'checkbox',
                'name': 'hideprefix',
                'id': 'hideprefix',
                'value': '1'
        } );
        if ( hideprefixVal == '1' ) {
                $hideprefixInput.attr( 'checked', 'checked' );
        }
        var $hideprefixRow = $( '<tr/>' )
                .append( $( '<td/>', {
                        'class': 'mw-label',
                        'html': $hideprefixLabel
                        } ) )
                .append( $( '<td/>', {
                        'class': 'mw-input',
                        'html': $hideprefixInput
                        } ) );
        // Add checkbox
        $( '#nsselect' ).find( ' > tbody:first' ).append( $hideprefixRow );
        // Do it
        if ( prefix && hideprefixVal == '1' ) {
                $( '#mw-prefixindex-list-table td a' ).text( function( i, val ) {
                        return val.replace( prefix, '' );
                } );
        }
}