MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
$(function () {
  $('#searchInput').attr('placeholder', 'Search the library');

// Add custom button to TinyMCE
// get an instance of the editor
var editor=tinymce.editors[0]; 
//add a button to the editor buttons
editor.addButton('mysecondbutton', {
  text: 'My second button',
  icon: false,
  onclick: function () {
    editor.insertContent('&nbsp;<b>It\'s my second button!</b>&nbsp;');
  }
});

//the button now becomes
var button=editor.buttons['mysecondbutton'];

//find the buttongroup in the toolbar found in the panel of the theme
var bg=editor.theme.panel.find('toolbar buttongroup')[0];

//without this, the buttons look weird after that
bg._lastRepaintRect=bg._layoutRect;

//append the button to the group
bg.append(button);

}());