Whitelist Selector

[davidofwatkins]

This adds support to opt-in to FastClick for elements matching a specified query selector. Instead of using .needsclick everywhere, FastClick can now apply itself only to elements matching .fastclick, for example:

FastClick.attach(document.body, {
    // only enable for elements with the .fastlcick class and their children
    selector: '.fastclick, .fastclick *'
});

<a>Ignored by FastClick</a>
<a class="fastclick">Uses FastClick</a>

I was previously using SelectiveFastclick to handle this, but it was causing some problems with scrolling on iOS, and it didn't make much sense to me to have the overhead of an entirely separate project for what should be a small feature.

Here are some GitHub issues that this may address:

• Opposite of needsclick? #290
• Use FastClick only for items matching selector #109
• A potential solution to issues with Google Places Autocomplete #347
• Contrary for .needsclick class #488

Unfortunately, browser support for this is a bit more limited than FastClick, itself, so I've noted that in the README. This may be a deal-breaker (it wasn't for me), so hopefully this PR is at least helpful to someone even if it's not fully ready to merge.