মিডিয়াউইকি:Group-sysop.js

/** Creates a button to invert checkboxes on Special:Undelete */
$(function() {
    var form        = document.forms["undelete"];
    if (!form)  return;
    var elements    = form.elements;
    var submitBtn   = elements["mw-undelete-submit"];
    if (!submitBtn) return;
    var toggleBtn   = document.createElement("input");
    toggleBtn.type  = "button";
    toggleBtn.value ="Invert selection";
    toggleBtn.onclick   = function() {
        for (var i=0; i<elements.length; i++) {
            var input   = elements[i];
            if (input.type != "checkbox")   continue;
            input.checked   = !input.checked;
        }
    }
    submitBtn.parentNode.insertBefore(toggleBtn, submitBtn);
});