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BookStack/resources/assets/js/services/dom.js

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JavaScript
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2019-06-07 18:46:19 +02:00
/**
* Run the given callback against each element that matches the given selector.
* @param {String} selector
* @param {Function<Element>} callback
*/
export function forEach(selector, callback) {
const elements = document.querySelectorAll(selector);
for (let element of elements) {
callback(element);
}
}
/**
* Helper to listen to multiple DOM events
* @param {Element} listenerElement
* @param {Array<String>} events
* @param {Function<Event>} callback
*/
export function onEvents(listenerElement, events, callback) {
for (let eventName of events) {
listenerElement.addEventListener(eventName, callback);
}
}
/**
* Set a listener on an element for an event emitted by a child
* matching the given childSelector param.
* Used in a similar fashion to jQuery's $('listener').on('eventName', 'childSelector', callback)
* @param {Element} listenerElement
* @param {String} childSelector
* @param {String} eventName
* @param {Function} callback
*/
export function onChildEvent(listenerElement, childSelector, eventName, callback) {
listenerElement.addEventListener(eventName, function(event) {
const matchingChild = event.target.closest(childSelector);
if (matchingChild) {
callback.call(matchingChild, event, matchingChild);
}
});
}
/**
* Look for elements that match the given selector and contain the given text.
* Is case insensitive and returns the first result or null if nothing is found.
* @param {String} selector
* @param {String} text
* @returns {Element}
*/
export function findText(selector, text) {
const elements = document.querySelectorAll(selector);
text = text.toLowerCase();
for (let element of elements) {
if (element.textContent.toLowerCase().includes(text)) {
return element;
}
}
return null;
}