global-event-handlers

GlobalEventHandlers mapped out completely - cross browsers

Using this powerful little tool will map out for you all Global Event Handlers in any browser you'd wish to execute it on.

installation

npm install global-event-handlers-map --save

usage

const getGlobalEventHandlersMap = require('global-event-handlers-map');

const gehsMap = getGlobalEventHandlersMap();

output

a map of all global event listeners in the browser in the following format:

{
    'OBJECT': [
        'onEVENT1',
        'onEVENT2',
        'onEVENT3'
    ]
}

example

const getGlobalEventHandlersMap = require('global-event-handlers-map');

const webSocketGEHsMap = getGlobalEventHandlersMap('WebSocket');

(webSocketGEHsMap == {
  "WebSocket": [
    "onopen",
    "onerror",
    "onclose",
    "onmessage"
  ] // results in true
});

here's an example of how to register with your own listener to every global event handler that exists on window!

const windowGEHsMap = getGlobalEventHandlersMap('window')['window'];

for (let i = 0; i < windowGEHsMap.length; i++) {
  const geh = windowGEHsMap[i];
  window[geh] = (event) => { console.log(event) });
}

options

1. filter (first optional argument)

allows you to pass a string that must exist within the object in order for it to make it to the final result map:

const getGlobalEventHandlersMap = require('global-event-handlers-map');

const gehsMap = getGlobalEventHandlersMap('*'); // will return a non-filtered map
const gehsMap = getGlobalEventHandlersMap('HTML'); // will return a map that only contains objects that contain the string 'HTML' (such as 'HTMLBodyElement')
const gehsMap = getGlobalEventHandlersMap('Doc'); // will return a map that only contains objects that contain the string 'Doc' (such as 'Document')

default value: '*'

2. hasOwnProperty (second optional argument)

allows you to pass a boolean that indicates whether iterated object must has iterated property as its own property or not:

const getGlobalEventHandlersMap = require('global-event-handlers-map');

const gehsMap = getGlobalEventHandlersMap('*', true); // will return a map with objects and global event handlers properties that are the object's own properties
const gehsMap = getGlobalEventHandlersMap('*', false); // will return a map with objects and global event handlers properties - whether the properties are the object's own properties or not

default value: true

3. noEmptyArrays (third optional argument)

allows you to pass a boolean that indicates whether final result object should contain objects that have zero global event handlers or not:

const getGlobalEventHandlersMap = require('global-event-handlers-map');

const gehsMap = getGlobalEventHandlersMap('*', true, true); // will return a map with objects and global event handlers properties only if the object even has any global event handlers
const gehsMap = getGlobalEventHandlersMap('*', true, false); // will return a map with objects and global event handlers properties whether the object has any global event handlers or not

default value: false

4. debug (fourth optional argument)

allows you to pass a boolean that indicates whether to run module in debug mode or not. debug mode just logs errors in case any are thrown:

const getGlobalEventHandlersMap = require('global-event-handlers-map');

const gehsMap = getGlobalEventHandlersMap('*', true, true, true); // will run in debug mode
const gehsMap = getGlobalEventHandlersMap('*', true, false, false); // will not run in debug mode

default value: false

contribution

in addition to this project there is a website that should show the global event handlers map of every (os + browser) combination that ever existed. in reality however, it shows most of the existing combinations, but not all of them. the maps were extracted using every existing combination in browserstack, but even in browserstack many automatic combinations have failed. also, the extraction script is not automatic and does not run every time there's a new browser/os. contributing to the JSON could help a lot with maintaining the map and keeping it as updated and as accurate as possible. highly appreciated!