Enable/disable an Actionbutton on a given page

Question

I am developing an extension for Firefox browsers, soon arose the need to control the action button so that it is inactive until the user enters a particular page.

Exemplifying, I will use as an example the page "/". Well, I would like the button to be active only when the tab is active and this page is open.

Just follow my code:

var data = require("sdk/self").data;

// o painel que será exibido
var panel = require("sdk/panel").Panel({
    contentURL: data.url("painel.html")
});


// as configurações do botão de ação
var actionBtn = require("sdk/ui/button/action").ActionButton({
    id: "ID do botão",
    label: "Descrição do botão",
    icon: {
        "16": "./logo-16.png",
        "36": "./logo-36.png"
    },
    onClick : openPanel
});

// função que exibe o painel quando o botão de ação é clicado.
function openPanel(){
    panel.show();
}

So far I have the normal code, only to open the panel when the user clicks on it. How can I make this control on/off?

Answer 1

Check the URL value, tabs.activeTab.url, and if whatever you want, you can disable the button by setting the disabled property to true;

var tabs = require("sdk/tabs");

function onOpen(tab) {
  console.log(tab.url + " is open");
  tab.on("pageshow", logShow);
  tab.on("activate", logActivate);    // Voce pode acessar a aba atual nesta funcao
  tab.on("deactivate", logDeactivate);
  tab.on("close", logClose);
}

function logShow(tab) {
  console.log(tab.url + " is loaded");
}

function logActivate(tab) {
  if(tab.url=="http://www.google.com"){
      actionBtn.disabled = true;
  } else {
      actionBtn.disabled = false;
  }
  console.log(tab.url + " is activated");
}

function logDeactivate(tab) {
  console.log(tab.url + " is deactivated");
}

function logClose(tab) {
  console.log(tab.url + " is closed");
}

tabs.on('open', onOpen);

References:

1. https://developer.mozilla.org/en-US/Add-ons/SDK/High-Level_APIs/tabs
2. https://stackoverflow.com/questions/11582607/find-url-of-current-tab-making-a-firefox-browser-add-on