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miniflux/ui/static/js/dom_helper.js
2020-10-16 15:44:03 -07:00

65 lines
1.8 KiB
JavaScript

class DomHelper {
static isVisible(element) {
return element.offsetParent !== null;
}
static openNewTab(url) {
let win = window.open("");
win.opener = null;
win.location = url;
win.focus();
}
static scrollPageTo(element, evenIfOnScreen) {
let windowScrollPosition = window.pageYOffset;
let windowHeight = document.documentElement.clientHeight;
let viewportPosition = windowScrollPosition + windowHeight;
let itemBottomPosition = element.offsetTop + element.offsetHeight;
if (evenIfOnScreen || viewportPosition - itemBottomPosition < 0 || viewportPosition - element.offsetTop > windowHeight) {
window.scrollTo(0, element.offsetTop - 10);
}
}
static getVisibleElements(selector) {
let elements = document.querySelectorAll(selector);
let result = [];
for (let i = 0; i < elements.length; i++) {
if (this.isVisible(elements[i])) {
result.push(elements[i]);
}
}
return result;
}
static findParent(element, selector) {
for (; element && element !== document; element = element.parentNode) {
if (element.classList.contains(selector)) {
return element;
}
}
return null;
}
static hasPassiveEventListenerOption() {
var passiveSupported = false;
try {
var options = Object.defineProperty({}, "passive", {
get: function() {
passiveSupported = true;
}
});
window.addEventListener("test", options, options);
window.removeEventListener("test", options, options);
} catch(err) {
passiveSupported = false;
}
return passiveSupported;
}
}