MediaWiki:Editbar.js

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/**
 * Adds a custom button.
 */
function addCustomButton(imageFile, speedTip, tagOpen, tagClose, sampleText) {
    mwCustomEditButtons.push({
        'imageFile' : imageFile,
        'speedTip' : speedTip,
        'tagOpen' : tagOpen,
        'tagClose' : tagClose,
        'sampleText' : sampleText
    });
}

/**
 * Add extra buttons to the edit menu.
 */
if (mwCustomEditButtons) {
    addCustomButton('images/0/07/Editbar_Underline.png', 'Underlined text', '{{Underline|', '}}', 'Underlined text');
    addCustomButton('images/9/9f/Editbar_Line_Break.png', 'Line Break', '{{Line Break}}', '', '');
    addCustomButton('images/f/fe/Editbar_Category.png', 'Category', '{{Category|', '}}' , 'Category Name');
    addCustomButton('images/a/a0/Editbar_Redirect.png', 'Redirect', '#REDIRECT [[', ']]', 'Target page name');
}