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