startup.js

pimcore.registerNS("pimcore.plugin.test");

pimcore.plugin.test = Class.create(pimcore.plugin.admin, {
    getClassName: function() {
        return "pimcore.plugin.test";
    },

    initialize: function() {
        pimcore.plugin.broker.registerPlugin(this);
    },
 
    pimcoreReady: function (params,broker){
        // alert("Test Plugin Ready!");
    },

    postOpenDocument: function (document, type) {
        if(document["type"] == "page" || document["type"] == "snippet") {
            var leftToolbar = document.edit.getLayout().getDockedItems('toolbar[dock="left"]').first();
            leftToolbar.add({
                tooltip: t("Add Widget to Top"),
                iconCls: "pimcore_icon_add",
                handler: function (el) {
                    alert("test");
                }
            });
        }
    }
});

var testPlugin = new pimcore.plugin.test();