purgeButton.user.js

// ==UserScript==
// @name       RabbitMQ Purge Button Adder
// @namespace  http://www.grazfather.com/userscripts/purgeButton.user.js
// @version    0.1
// @description Adds a 'purge' button to every queue in queues view.
// @match      http://localhost:15672/*
// @copyright  Me
// ==/UserScript==

// a function that loads jQuery and calls a callback function when jQuery has finished loading
function addJQuery(callback) {
    var script = document.createElement("script");
    script.setAttribute("src", "//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js");
    script.addEventListener('load', function() {
        var script = document.createElement("script");
        script.textContent = "window.jQ=jQuery.noConflict(true);(" + callback.toString() + ")();";
        document.body.appendChild(script);
    }, false);
    document.body.appendChild(script);
}

function purge_button_main() {
    var original_partial_update; // Holds the original partial_update function

    function add_purge_buttons() {
        debugger;
        jQ('#main div.updatable').children('table').children('tbody').children('tr').each(function (index) {
            var queuename = jQ(this).children('td').children('a').html();
            jQ(this).append('<td class="r"><form action="#/queues" method="delete" class="inline-form-right">' +
                            '<input type="hidden" name="vhost" value="/">' +
                            '<input type="hidden" name="name" value="' + queuename + '">' +
                            '<input type="hidden" name="mode" value="purge">' +
                            '<input type="submit" value="Purge">' +
                            '</form></td>');
        });
    }

    function new_partial_update() {
        console.log("In new partial_update()");
        add_purge_buttons();
        // Call original...
        original_partial_update();
        // ... and add our buttons
    }

    console.log("In purge button main");
    jQ(document).ready(function () {
        add_purge_buttons();
        // Hook the partial update function
        console.log("Hooking partial_update");
        //debugger;
        original_partial_update = partial_update;
        partial_update = new_partial_update;
    });
}

// load jQuery and execute the main function
console.log("Loading JQuery and calling purge_button_main");
addJQuery(purge_button_main);