How to open a page with the current URL as a query in Opera extension popup?

Question

Opera

Hello!
I want to write an Opera extension for this one - vPass . I need to open a popup with the current URL as a parameter (query string) — popup.html? current.tab.url
Maybe someone has already done something similar? Thank you!

Answer 1

Or maybe I’ll answer myself :) suddenly it will come in handy for someone ...
background.js

// Add a button to Opera's toolbar when the extension loads.
window.addEventListener("load", function() {
  // Buttons are members of the UIItem family.
  // Firstly we set some properties to apply to the button.
  var UIItemProperties = {
    disabled: false, // The button is enabled.
    title: "vPass", // The tooltip title.
    icon: "icon_18.png", // The icon (18x18) to use for the button.

    popup: {
      href: "https://www.vpass.info/?",
      width: "500px",
      height: "500px"
    },

    onclick: function()
    {
      var extension = window.opera.extension;
      var focusedTab = opera.extension.tabs.getFocused();
      var url = '';
      if(focusedTab) 
      {
        url = focusedTab.url;
        button.popup.href='https://www.vpass.info/?'+url;
      }
    }

  };

  // Next, we create the button and apply the above properties.
    var button = opera.contexts.toolbar.createItem(UIItemProperties);
    // Finally, we add the button to the toolbar.
    opera.contexts.toolbar.addItem(button);
}, false);