95 lines
2.7 KiB
JavaScript
95 lines
2.7 KiB
JavaScript
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'use strict';
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function cssBlankPseudo(document, opts) {
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// configuration
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const className = Object(opts).className;
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const attr = Object(opts).attr || 'blank';
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const force = Object(opts).force;
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try {
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document.querySelector(':blank');
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if (!force) {
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return;
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}
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} catch (ignoredError) {}
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/* do nothing and continue */
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// observe value changes on <input>, <select>, and <textarea>
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const window = (document.ownerDocument || document).defaultView;
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observeValueOfHTMLElement(window.HTMLInputElement);
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observeValueOfHTMLElement(window.HTMLSelectElement);
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observeValueOfHTMLElement(window.HTMLTextAreaElement); // form control elements selector
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const selector = 'input,select,textarea'; // conditionally update all form control elements
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Array.prototype.forEach.call(document.querySelectorAll(selector), node => {
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node.addEventListener('input', configureCssBlankAttribute);
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configureCssBlankAttribute.call(node);
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}); // conditionally observe added or unobserve removed form control elements
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new MutationObserver(mutationsList => {
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mutationsList.forEach(mutation => {
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if (mutation.addedNodes) {
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mutation.addedNodes.forEach(node => {
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if (node.nodeType === 1 && node.matches(selector)) {
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node.addEventListener('input', configureCssBlankAttribute);
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configureCssBlankAttribute.call(node);
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}
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});
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}
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if (mutation.removedNodes) {
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mutation.removedNodes.forEach(node => {
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if (node.nodeType === 1 && node.matches(selector)) {
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node.removeEventListener('input', configureCssBlankAttribute);
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}
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});
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}
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});
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}).observe(document, {
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childList: true,
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subtree: true
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}); // update a form control element’s css-blank attribute
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function configureCssBlankAttribute() {
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if (this.value) {
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if (attr) {
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this.removeAttribute(attr);
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}
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if (className) {
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this.classList.remove(className);
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}
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this.removeAttribute('blank');
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} else {
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if (attr) {
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this.setAttribute('blank', attr);
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}
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if (className) {
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this.classList.add(className);
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}
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}
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} // observe changes to the "value" property on an HTML Element
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function observeValueOfHTMLElement(HTMLElement) {
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const descriptor = Object.getOwnPropertyDescriptor(HTMLElement.prototype, 'value');
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const nativeSet = descriptor.set;
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descriptor.set = function set(value) {
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// eslint-disable-line no-unused-vars
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nativeSet.apply(this, arguments);
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configureCssBlankAttribute.apply(this);
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};
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Object.defineProperty(HTMLElement.prototype, 'value', descriptor);
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}
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}
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module.exports = cssBlankPseudo;
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//# sourceMappingURL=index.js.map
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