/
clipboard.js
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/
clipboard.js
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import ClipboardAction from './clipboard-action';
import Emitter from 'tiny-emitter';
import listen from 'good-listener';
/**
* Base class which takes one or more elements, adds event listeners to them,
* and instantiates a new `ClipboardAction` on each click.
*/
class Clipboard extends Emitter {
/**
* @param {String|HTMLElement|HTMLCollection|NodeList} trigger
* @param {Object} options
*/
constructor(trigger, options) {
super();
this.resolveOptions(options);
this.listenClick(trigger);
}
/**
* Defines if attributes would be resolved using internal setter functions
* or custom functions that were passed in the constructor.
* @param {Object} options
*/
resolveOptions(options = {}) {
this.action = (typeof options.action === 'function') ? options.action : this.defaultAction;
this.target = (typeof options.target === 'function') ? options.target : this.defaultTarget;
this.text = (typeof options.text === 'function') ? options.text : this.defaultText;
this.container = (typeof options.container === 'object') ? options.container : document.body;
}
/**
* Adds a click event listener to the passed trigger.
* @param {String|HTMLElement|HTMLCollection|NodeList} trigger
*/
listenClick(trigger) {
this.listener = listen(trigger, 'click', (e) => this.onClick(e));
}
/**
* Defines a new `ClipboardAction` on each click event.
* @param {Event} e
*/
onClick(e) {
const trigger = e.delegateTarget || e.currentTarget;
if (this.clipboardAction) {
this.clipboardAction = null;
}
this.clipboardAction = new ClipboardAction({
action : this.action(trigger),
target : this.target(trigger),
text : this.text(trigger),
container : this.container,
trigger : trigger,
emitter : this
});
}
/**
* Default `action` lookup function.
* @param {Element} trigger
*/
defaultAction(trigger) {
return getAttributeValue('action', trigger);
}
/**
* Default `target` lookup function.
* @param {Element} trigger
*/
defaultTarget(trigger) {
const selector = getAttributeValue('target', trigger);
if (selector) {
return document.querySelector(selector);
}
}
/**
* Returns the support of the given action, or all actions if no action is
* given.
* @param {String} [action]
*/
static isSupported(action = ['copy', 'cut']) {
const actions = (typeof action === 'string') ? [action] : action;
let support = !!document.queryCommandSupported;
actions.forEach((action) => {
support = support && !!document.queryCommandSupported(action);
});
return support;
}
/**
* Default `text` lookup function.
* @param {Element} trigger
*/
defaultText(trigger) {
return getAttributeValue('text', trigger);
}
/**
* Destroy lifecycle.
*/
destroy() {
this.listener.destroy();
if (this.clipboardAction) {
this.clipboardAction.destroy();
this.clipboardAction = null;
}
}
}
/**
* Helper function to retrieve attribute value.
* @param {String} suffix
* @param {Element} element
*/
function getAttributeValue(suffix, element) {
const attribute = `data-clipboard-${suffix}`;
if (!element.hasAttribute(attribute)) {
return;
}
return element.getAttribute(attribute);
}
module.exports = Clipboard;