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export { qs, qsa, $on, $delegate, $parent, remove };
// Get element(s) by CSS selector:
const qs = (selector, scope) => {
return (scope || document).querySelector(selector);
};
const qsa = (selector, scope) => {
return (scope || document).querySelectorAll(selector);
};
// addEventListener wrapper:
const $on = (target, type, callback, useCapture) => {
target.addEventListener(type, callback, !!useCapture);
};
// Attach a handler to event for all elements that match the selector,
// now or in the future, based on a root element
const $delegate = (target, selector, type, handler) => {
const useCapture = type === "blur" || type === "focus";
$on(target, type, dispatchEvent, useCapture);
function dispatchEvent(event) {
const targetElement = event.target;
const potentialElements = qsa(selector, target);
const hasMatch = Array.prototype.indexOf.call(potentialElements, targetElement) >= 0;
if (hasMatch)
handler.call(targetElement, event);
}
};
// Find the element's parent with the given tag name:
// $parent(qs('a'), 'div');
const $parent = (element, tagName) => {
if (!element.parentNode)
return undefined;
if (element.parentNode.tagName.toLowerCase() === tagName.toLowerCase())
return element.parentNode;
return $parent(element.parentNode, tagName);
};
// removes an element from an array
// const x = [1,2,3]
// remove(x, 2)
// x ~== [1,3]
const remove = (array, thing) => {
const index = array.indexOf(thing);
if (index === -1)
return array;
return array.splice(index, 1);
};
// Allow for looping on nodes by chaining:
// qsa('.foo').forEach(function () {})
NodeList.prototype.forEach = Array.prototype.forEach;