You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

95 lines
2.7 KiB

4 years ago
'use strict';
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);
}
}
module.exports = cssBlankPseudo;
//# sourceMappingURL=index.js.map