Support async ts.ui.get(elm, callback)

[wiredearp]

@zdlm @sampi @rafalages @tstapleton

Fixes #258: Async ts.ui.get();

You can now pass a callback that will be executed

• when the element gets spiritualized sometimes later; or
• straight away, if the element is already spiritualized.

If the callback is provided, ts.ui.get returns nothing. If the callback is not provided, it works as usual. It could work something like this.

var button = document.createElement('button');
button.setAttribute('data-ts', 'Button');
ts.ui.get(button, spirit => {
    alert(spirit); // [object ts.ui.ButtonSpirit]
});
setTimeout(() => {
    document.body.appendChild(button); // trigger the callback
}, 1000);

The docs, or at least most of them, have been updated to use this fancy pattern. We should of course dedicate a whole page to explain this stuff in the Intro section somewhere and I've added the task to the Documentation project over on https://github.com/Tradeshift/tradeshift-ui/projects/4.

Also in PR: somewhere in docs, there was apparently a maximim callstack exceeded here and that seems to be correct, although not completely sure why it never happened before. This would affect the iPad breakpoint on menu navigation.

[zdlm]

🅰️

[rafalages]

Great, thank you guys