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* DOM utility class for HTML manipulation
* Provides a clean API for common DOM operations with null safety
*/
export class DomUtils {
/**
* Get a single element by CSS selector
* @param selector CSS selector string
* @returns HTMLElement or null if not found
*/
static getElement(selector: string): HTMLElement | null {
return document.querySelector(selector) as HTMLElement;
}
/**
* Get multiple elements by CSS selector
* @param selector CSS selector string
* @returns NodeList of HTMLElements
*/
static getElements(selector: string): NodeListOf<HTMLElement> {
return document.querySelectorAll(selector) as NodeListOf<HTMLElement>;
}
/**
* Clear the innerHTML of an element
* @param selector CSS selector string
*/
static clearElement(selector: string): void {
const element = this.getElement(selector);
if (element) element.innerHTML = "";
}
/**
* Set the text content of an element
* @param selector CSS selector string
* @param text Text content to set
*/
static setText(selector: string, text: string): void {
const element = this.getElement(selector);
if (element) element.textContent = text;
}
/**
* Get the text content of an element
* @param selector CSS selector string
* @returns The text content or empty string if not found
*/
static getText(selector: string): string {
const element = this.getElement(selector);
return element ? element.textContent || "" : "";
}
/**
* Show an element by setting display to block
* @param selector CSS selector string
*/
static showElement(selector: string): void {
const element = this.getElement(selector);
if (element) element.style.display = "block";
}
/**
* Hide an element by setting display to none
* @param selector CSS selector string
*/
static hideElement(selector: string): void {
const element = this.getElement(selector);
if (element) element.style.display = "none";
}
/**
* Hide all elements matching selector by setting display to none
* @param selector CSS selector string
*/
static hideAllElements(selector: string): void {
const elements = this.getElements(selector);
elements.forEach(element => element.style.display = "none");
}
/**
* Clone a template element's content
* @param templateId ID of the template element
* @returns DocumentFragment containing cloned content
* @throws Error if template not found
*/
static cloneTemplate(templateId: string): DocumentFragment {
const template = document.getElementById(templateId) as HTMLTemplateElement;
if (!template) {
throw new Error(`Template with id "${templateId}" not found`);
}
return template.content.cloneNode(true) as DocumentFragment;
}
/**
* Clone a template and append it to a parent element
* @param templateId ID of the template element
* @param parent Parent element to append to
* @returns DocumentFragment that was appended
*/
static appendTemplate(templateId: string, parent: HTMLElement): DocumentFragment {
const clone = this.cloneTemplate(templateId);
parent.appendChild(clone);
return clone;
}
/**
* Set text content on an element within a DocumentFragment
* @param clone DocumentFragment to search within
* @param selector CSS selector string
* @param text Text content to set
*/
static setTemplateText(clone: DocumentFragment, selector: string, text: string): void {
const element = clone.querySelector(selector) as HTMLElement;
if (element) {
element.textContent = text;
}
}
/**
* Set HTML content on an element within a DocumentFragment
* @param clone DocumentFragment to search within
* @param selector CSS selector string
* @param html HTML content to set
*/
static setTemplateHTML(clone: DocumentFragment, selector: string, html: string): void {
const element = clone.querySelector(selector) as HTMLElement;
if (element) {
element.innerHTML = html;
}
}
/**
* Set an attribute on an element within a DocumentFragment
* @param clone DocumentFragment to search within
* @param selector CSS selector string
* @param attribute Attribute name
* @param value Attribute value
*/
static setTemplateAttribute(clone: DocumentFragment, selector: string, attribute: string, value: string): void {
const element = clone.querySelector(selector) as HTMLElement;
if (element) {
element.setAttribute(attribute, value);
}
}
/**
* Common focusable element selector
*/
static readonly focusableElements = "a, button, input, textarea, select, [tabindex]:not([tabindex=\"-1\"])";
/**
* Make elements non-tabbable by setting tabindex to -1
* @param selector CSS selector string
*/
static makeFocusableElementsNonTabbable(selector: string): void {
const elements = this.getElements(selector);
elements.forEach(container => {
const focusableElements = container.querySelectorAll(this.focusableElements);
focusableElements.forEach((el) => {
(el as HTMLElement).setAttribute("tabindex", "-1");
});
});
}
/**
* Restore tabbing by removing tabindex=-1 from elements
* @param selector CSS selector string
*/
static restoreFocusableElements(selector: string): void {
const elements = this.getElements(selector);
elements.forEach(container => {
const focusableElements = container.querySelectorAll("[tabindex=\"-1\"]");
focusableElements.forEach((el) => {
(el as HTMLElement).removeAttribute("tabindex");
});
});
}
/**
* Set accessibility attributes on elements
* @param selector CSS selector string
* @param hidden Whether elements should be hidden from screen readers
* @param visible Whether elements should be visible
*/
static setAccessibilityState(selector: string, hidden: boolean, visible: boolean): void {
const elements = this.getElements(selector);
elements.forEach(element => {
element.setAttribute("aria-hidden", hidden.toString());
element.style.visibility = visible ? "visible" : "hidden";
});
}
/**
* Get the value of an input element
* @param selector CSS selector string
* @returns The input value or empty string if not found
*/
static getValue(selector: string): string {
const element = this.getElement(selector) as HTMLInputElement;
return element ? element.value : "";
}
/**
* Set the value of an input element
* @param selector CSS selector string
* @param value Value to set
*/
static setValue(selector: string, value: string): void {
const element = this.getElement(selector) as HTMLInputElement;
if (element) element.value = value;
}
/**
* Add a CSS class to an element
* @param selector CSS selector string
* @param className Class name to add
*/
static addClass(selector: string, className: string): void {
const element = this.getElement(selector);
if (element) element.classList.add(className);
}
/**
* Remove a CSS class from an element
* @param selector CSS selector string
* @param className Class name to remove
*/
static removeClass(selector: string, className: string): void {
const element = this.getElement(selector);
if (element) element.classList.remove(className);
}
/**
* Toggle a CSS class on an element
* @param selector CSS selector string
* @param className Class name to toggle
*/
static toggleClass(selector: string, className: string): void {
const element = this.getElement(selector);
if (element) element.classList.toggle(className);
}
/**
* Check if an element has a CSS class
* @param selector CSS selector string
* @param className Class name to check
* @returns True if element has the class, false otherwise
*/
static hasClass(selector: string, className: string): boolean {
const element = this.getElement(selector);
return element ? element.classList.contains(className) : false;
}
}
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