JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.
Any URL's added here will be added as <script>
s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.
You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.
If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.
You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.
HTML Settings
Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.
<form id="add-to-list">
<label for="list-item">What do you want to add to your list?</label>
<input type="text" id="list-item">
<button>Add to your list</button>
</form>
<div id="list" aria-live="polite"></div>
body {
margin: 0 auto;
max-width: 40em;
width: 88%;
}
label,
input {
display: block;
width: 100%;
}
// Data State
var data = {
listItems: []
};
// UI Template
var template = function () {
// If there are no list items
if (data.listItems.length < 1) return '<p><em>You do not have any list items yet. Try adding one with the form above.</em></p>';
// If there are
return '<ul>' + data.listItems.map(function (item) {
return '<li>' + item + '</li>';
}).join('') + '</ul>';
};
// Function to render the UI into the DOM
var render = function () {
// Render the UI
var list = document.querySelector('#list');
if (!list) return;
list.innerHTML = template();
// Save to localStorage
localStorage.setItem('list', JSON.stringify(data));
};
// Check for saved list items
var savedData = localStorage.getItem('list');
if (savedData) {
data = JSON.parse(savedData);
}
// Render the UI
render();
/*!
* Sanitize and encode all HTML in a user-submitted string
* (c) 2018 Chris Ferdinandi, MIT License, https://gomakethings.com
* @param {String} str The user-submitted string
* @return {String} str The sanitized string
*/
var sanitizeHTML = function (str) {
var temp = document.createElement('div');
temp.textContent = str;
return temp.innerHTML;
};
// Listen for form submissions
document.addEventListener('submit', function (event) {
// Make sure the submitted form was for our list items
if (!event.target.matches('#add-to-list')) return;
// Stop the form from submitting
event.preventDefault();
// Get the list item
var item = event.target.querySelector('#list-item');
if (!item || item.length < 1) return;
// Update the data and UI
data.listItems.push(sanitizeHTML(item.value));
render();
// Clear the field and return to focus
item.value = '';
item.focus();
}, false);
Also see: Tab Triggers