mousetrap.help.js is an extension to mousetrap.js that automatically generates a beautiful help overlay containing the currently active key bindings. It looks like this:
- Include mousetrap.js and mousetrap.help.js:
<script src="mousetrap.min.js"></script>
<script src="mousetrap.help.min.js"></script>
- Use the same API as mousetrap.js, with one change - add the help text after the regular parameter to bind:
//Regular bind call with help text:
Mousetrap.bind("a", some_callback, "Help text that appears in the overlay.");
//Bind call with a third parameter specifier (keyup):
Mousetrap.bind("b", other_callback, "keyup", "The help text is not the fourth parameter.");
- When user presses "?" he will see the help overlay.
The following functions are added to the Mousetrap API with this extension:
Mousetrap.showHelp - Show the help lightbox (overlay).
Mousetrap.hideHelp - Hide the help lightbox (overlay).
Mousetrap.toggleHelp - Toggle the visibility of the help lightbox (overlay).
The default key used for the help overlay is "?" but you can also bind it to whatever key you want:
Mousetrap.bind("h", Mousetrap.toggleHelp);
You can customize the layout using CSS.
The basic overlay is the simplest lightbox code made to look as close to gmail's help screen is possible. It is inserted immediately after the head statement to make sure that you can override it and use CSS to style it to you needs. The CSS is minified in the source code but an unminified copy should be at a file called "unminified_help.css" in the same dir as the JS. It is no needed but lets you see the styles and the names of the classes and ids. The main parts are:
.mousetrap_lightbox - the main lightbox popup.
#mousetrap_title - the title "Keyboard Shortcuts".
#mousetrap_table - the shortcut display is a div table whose root is this.
.mousetrap_key - the key itself, in yellow above.
.mousetrap_sequence - the whole sequence including the key, "then", "+" and ","
Maybe in the future we'll add more styling and provide other styles that look like other site's help page.
Feel free to report bugs and add features and suggestions. You can see future features here: https://trello.com/board/moustrap/50de15440b4c796603000095
@ccampbell for the mousetrap.js library.
@ecgan for a lot of help, getting me on the right track and suggestions.