/
devtoolsBackground.js
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/
devtoolsBackground.js
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/* jslint browser: true */
/* global chrome, $0 */
function getPanelContents(settings) {
if (!$0) return;
settings || (settings = {});
// In case we're in an <iframe>
var document = $0.ownerDocument;
var window = document.defaultView;
// We will only work if there is a "jQuery" function.
// TODO: Alternatively check for an AMD module.
if (typeof window.jQuery !== 'function')
return (function(msg) {
return (msg.Error = '@(window.jQuery is missing)'), msg;
})(Object.create(null));
if (typeof window.jQuery._data !== 'function')
return (function(msg) {
return (msg.Error = '@(jQuery version is too old)'), msg;
})(Object.create(null));
return (function($, el) {
function internalClass(obj) {
return Object.prototype.toString.call(obj).match(/\[object (\w+)\]/)[1];
}
// Return objects with "__proto__ = null" so we don't clutter up the panel.
function extendNull() {
return $.extend.apply(null, [].concat.apply([Object.create(null)], arguments));
}
// Turn certain objects into descriptive strings so they're easier to read.
function exportify(obj, none) {
if (obj === null) return none ? '@(none)' : '@(null)';
if (obj === undefined) return none ? '@(none)' : '@(undefined)';
if (obj === false && none) return '@(none)';
if (typeof obj !== 'object') return obj;
var hasKeys = !!Object.keys(obj).length;
if (none && !hasKeys) return '@(none)';
if (hasKeys) return extendNull(obj);
return '@(empty ' + internalClass(obj) + ')';
}
// Get/create the comment nodes "<!-- @(window) -->" and "<!-- @(document) -->"
// that go below "<html>". These are used as representations for
// the "window" and "document" objects. Since they don't have a representation
// in the Elements Panel, but can have event listeners, we add the comment
// nodes for convenience.
//
// These use to be above the "<!DOCTYPE html>". There is bug in Chrome
// the caused the Elements Panel to scroll to the selected element if the DOM
// changed when these helper elements were above "<html>". So, they got moved.
//
// To turn them off go to Extensions -> jQuery Audit -> options
//
var jQueryAudit = !settings.displayHelpers ? {} : window.jQueryAudit ||
(window.jQueryAudit = (function() {
var target = document.documentElement.firstChild;
var parent = target.parentNode;
var jQA = {};
try {
jQA.window = parent.insertBefore(
document.createComment('@(window)'),
target );
jQA.document = parent.insertBefore(
document.createComment('@(document)'),
target );
jQA.cleanup = function() {
parent.removeChild(jQA.window);
parent.removeChild(jQA.document);
jQA.cleanup = jQA.window = jQA.document = null;
};
} catch(err) {}
return jQA;
})());
// Check if we're on "<!-- @(window) -->" or "<!-- @(document) -->"
var target = (el === jQueryAudit.window) ? window :
(el === jQueryAudit.document) ? document :
el;
// Get all the events this element will react to, either because they're
// directly bound to it w/o delegation, or because some ancestor is delegating.
var events = (function() {
var el = target;
var ancestors = (el === window) ? [ window ] :
(el === document) ? [ document ] :
[ el ].concat( $(el).parents().toArray(), document, window );
return $.map(ancestors, function(node) {
return $.map(($._data(node)||0).events || {}, function(val) {
return val;
}).filter(function(ev) {
var sel = ev.selector;
if (!sel) return node === el;
// Pretty much the same methodology jQuery uses
// https://github.com/jquery/jquery/blob/1.10.2/src/event.js#L435
return (ev.needsContext) ?
$(sel, node).length :
$.find(sel, node, null, (el.nodeType === 1) ? [ el ] : []).length;
}).map(function(ev) {
return extendNull(ev, {
delegator: (node === el) ? '@(this element)' : node
});
});
}).reduce(function(acc, ev) {
++acc.sum[ev.type] || (acc.sum[ev.type] = 0);
acc.all[ev.type + '.' + acc.sum[ev.type]] = ev;
acc.i++;
return acc;
}, {
i: 0,
all: {},
sum: {}
});
})();
var internalData = (function() {
return $._data(target);
})();
var data = (function() {
var _data = $._data(target);
// Avoid $(..).data() side-effects
return _data && _data.parsedAttrs && _data.data;
})();
var dataset = (function() {
return target.dataset;
})();
// If you have <div><p class="myClass"><a href="#"></p></div> and you select the <p>,
// it returns <p class="myClass"></p>
var ownHTML = (function() {
var outerHTML = target.outerHTML;
if (outerHTML && ('innerHTML' in target))
return outerHTML.replace(target.innerHTML, '');
})();
// Panel output
return extendNull( (function() {
var panel = {};
panel['@(this element)'] = target;
panel['Data'] = exportify( data );
panel['Events(' + events.i + ')'] = exportify( events.all, true);
panel['Internal Data'] = exportify( internalData, true );
panel['dataset'] = exportify( dataset );
panel['own HTML'] = exportify( ownHTML, true );
return panel;
})() );
})(window.jQuery, $0);
}
var backgroundPageConnection = chrome.runtime.connect({
name: 'devtools-jqueryaudit'
});
// Pass "tabId" to the background page so we can cleanup after the panel closes.
backgroundPageConnection.postMessage({
tabId: chrome.devtools.inspectedWindow.tabId
});
var elements = chrome.devtools.panels.elements;
elements.createSidebarPane('jQuery Audit', function(sidebar) {
// Assume we're visible from the start
var isVisible = true;
updatePanelContents();
elements.onSelectionChanged.addListener(function() {
if (isVisible) updatePanelContents();
});
// "onShown" is flaky on Chrome 31
if (getChromeVersion() > 31) {
// Don't update the sidebar if it's not visible
sidebar.onShown.addListener(function() {
isVisible = true;
updatePanelContents();
});
sidebar.onHidden.addListener(function() {
isVisible = false;
});
}
function updatePanelContents() {
sidebar.setExpression( serializeAsIIFE(getPanelContents, getSettings()) );
}
});
function serializeAsIIFE(fn) {
var params = Array.prototype.slice
.call(arguments, 1)
.map(function(arg) {
return JSON.stringify(arg);
}).join(',');
return [ '(', fn.toString(), ')(', params, ')' ].join('');
}
function getChromeVersion() {
return parseInt(navigator.userAgent.match(/chrome\/(\d+)/i)[1]);
}
function getSettings() {
var store = localStorage;
// Default settings
var settings = {
displayHelpers: true
};
if ('displayHelpers' in store) {
(settings.displayHelpers = !!parseInt(store.displayHelpers));
}
return settings;
}