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interface CreateElementOptions {
name: string,
properties?: object,
children?: Array<HTMLElement | Function | Node>
}
export function create_element_from_object(elementOptions: CreateElementOptions): HTMLElement {
return create_element(elementOptions.name, elementOptions.properties, elementOptions.children);
}
export function create_element(name: string, properties?: object, children?: Array<HTMLElement | any>): HTMLElement {
if (!name || name.length < 1) {
throw new Error("name is required");
}
const node = document.createElement(name);
if (properties) {
for (const [key, value] of Object.entries(properties)) {
// @ts-ignore
node[key] = value;
}
}
if (children && children.length > 0) {
let actualChildren = children;
if (typeof children === "function") {
// @ts-ignore
actualChildren = children();
}
for (const child of actualChildren) {
node.appendChild(child as Node);
}
}
return node;
}
// https://stackoverflow.com/a/45215694/11961742
export function get_selected_options(domElement: HTMLSelectElement): Array<string> {
const ret = [];
// fast but not universally supported
if (domElement.selectedOptions !== undefined) {
for (let i = 0; i < domElement.selectedOptions.length; i++) {
ret.push(domElement.selectedOptions[i].value);
}
// compatible, but can be painfully slow
} else {
for (let i = 0; i < domElement.options.length; i++) {
if (domElement.options[i].selected) {
ret.push(domElement.options[i].value);
}
}
}
return ret;
}
export function get_element_position(element: HTMLElement | any) {
if (!element) return {x: 0, y: 0};
let x = 0;
let y = 0;
while (true) {
x += element.offsetLeft;
y += element.offsetTop;
if (element.offsetParent === null) {
break;
}
element = element.offsetParent;
}
return {x, y};
}
export function restrict_input_to_numbers(element: HTMLElement, specials: Array<string> = [], mergeSpecialsWithDefaults: boolean = false): void {
if (!element) return;
element.addEventListener("keydown", (e) => {
const defaultSpecials = ["Backspace", "ArrowLeft", "ArrowRight", "Tab"];
let keys = specials.length > 0 ? specials : defaultSpecials;
if (mergeSpecialsWithDefaults && specials) {
keys = [...specials, ...defaultSpecials];
}
if (keys.indexOf(e.key) !== -1) {
return;
}
if (isNaN(parseInt(e.key))) {
e.preventDefault();
}
});
}
export function element_has_focus(element: HTMLElement): boolean {
return element === document.activeElement;
}
export function move_focus(element: HTMLElement): void {
if (!element) {
element = document.getElementsByTagName("body")[0];
}
element.focus();
// @ts-ignore
if (!element_has_focus(element)) {
element.setAttribute("tabindex", "-1");
element.focus();
}
}
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