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AboutAll PostsWarningRandom

Golfed Codepen – 3D Spiral Thing

  1. // sort of golfed version of https://www.instagram.com/p/C1uv6Kqv19T/
  2. // by @mewtru
  3. b = document.body
  4. a = Object.assign
  5. a(b.style, { background:'#000', color:'#fff'})
  6. w = 'snippet.zone snippet.zone'.toUpperCase().split``
  7. F = (n, O = 0, C, S, o, t) => { 
  8.   b.innerHTML += `<div id=${n} style='position:absolute;left:50%;top:50%;translate:-50% -50%;width:100% text-align:center;white-space:nowrap'></div>`
  9.   w.map(l => this[n].innerHTML += `<span style='display:inline-block;margin-right:5px;font-size:28px'>${l}</span>`)
  10.   t = O
  11.   setInterval(_ => {
  12.     t += .005
  13.     ;[...this[n].children].map((e, i) => { 
  14.       T = t + i / 2.7
  15.       a(e.style, {
  16.         translate: `0 ${Math.sin(T) * 100}px`,
  17.         scale: Math.cos(T) * .5 + .5})
  18.     }, 16)
  19.   })
  20. }
  21. F('Z') 
  22. F('X', 3)

“Very cool” pen by Lucas Fernando that comes from @mewtru
I decided to do a speed-coded semi-golfed version… can definitely be way more golfed 😀

// 3d // animation // codegolf // css // dom // golfed // hacks // javascript // math // speed-coded // speedcoding // strings

Simple Way to Validate CSS Colors

  1. function isColor(col) {
  2.   const cache = isColor[col]
  3.   if (cache != null) {
  4.     console.log('- reading cache')
  5.     return cache
  6.   }
  7.   isColor.el.style = ''
  8.   isColor.el.style.color = col
  9.   return isColor[col] = !!isColor.el.style.color
  10. }
  11. isColor.el = document.createElement('div')
  12.  
  13.  
  14. console.log('is "red" a color?', isColor('red'))
  15. console.log('from the cache: ', isColor('red'))
  16.  
  17. console.log('is "rgbx(1, 2, 3)" a color?', isColor('rgbx(1, 2, 3)'))
  18.  
  19. console.log('is "#0f0" a color?', isColor('#0f0'))
  20.  
  21. console.log('is "hsl(192, 50%, 50%)" a color?', isColor('hsl(192, 50%, 50%)'))
  22. console.log('from the cache: ', isColor('hsl(192, 50%, 50%)'))
  23.  
  24. console.log('is "lab(2000.1337% -8.6911 -159.131231 / .987189732)" ?',
  25.   isColor('lab(2000.1337% -8.6911 -159.131231 / .987189732)'))
  26.  
  27. console.log('is "snippetZone" ?', isColor('snippetZone'))

I find this technique is usually good enough to validate colors…

// color // css // dom // graphics // hacks // hex // html // javascript // tricks

Remove a DOM HTML Element

  1. const button = document.createElement('button');
  2. button.innerText = 'Hello There';
  3. document.body.appendChild(button);
  4.  
  5. // click anywhere
  6. document.body.addEventListener('click', () => {
  7.   if (button.parentNode != null) {
  8.     button.parentNode.removeChild(button);
  9.   }
  10. });

In vanilla js you’ll find yourself checking if an HTML DOM element can be removed, by seeing if it has a parent (as seen above). Forgetting to do so is the source of many errors.

With the death of IE11 you can use remove()

  1. const button = document.createElement('button');
  2. button.innerText = 'Hello There 2';
  3. document.body.appendChild(button);
  4.  
  5. // click anywhere
  6. document.body.addEventListener('click', () => {
  7.    button.remove();
  8. });

No error occurs when calling remove() on something that is already removed… just like the old jQuery days 😉

// dom // javascript // ui

Mutation Observer

  1. // Select the node that will be observed for mutations
  2. const targetNode = document.getElementById('some-id');
  3.  
  4. // Options for the observer (which mutations to observe)
  5. const config = { attributes: true, childList: true, subtree: true };
  6.  
  7. // Callback function to execute when mutations are observed
  8. const callback = function(mutationsList, observer) {
  9.     // Use traditional 'for loops' for IE 11 (goodbye IE11!!!!)
  10.     for(const mutation of mutationsList) {
  11.         if (mutation.type === 'childList') {
  12.             console.log('A child node has been added or removed.');
  13.         }
  14.         else if (mutation.type === 'attributes') {
  15.             console.log('The ' + mutation.attributeName + ' attribute was modified.');
  16.         }
  17.     }
  18. };
  19.  
  20. // Create an observer instance linked to the callback function
  21. const observer = new MutationObserver(callback);
  22.  
  23. // Start observing the target node for configured mutations
  24. observer.observe(targetNode, config);
  25.  
  26. // Later, you can stop observing
  27. observer.disconnect();

This is pure gold if you haven’t used it… (from MDN)

// dom // events // graphics // html // javascript // ui

React Vanilla

  1. <style>*{ font-family: sans-serif; margin-bottoM: .5em;}</style>
  2.  
  3. <h3>TODO</h3>
  4. <ul id=todos></ul>
  5. <label>What needs to be done?<br>
  6.   <input id=todo onchange="newTodo()"/><br>
  7. </label>
  8. <button id=add onclick="newTodo()">Add #1</button>
  9.  
  10. <script>
  11.   let count = 1
  12.   function newTodo() {
  13.     if (todo.value.length > 0) {
  14.       todos.innerHTML += `<li>${todo.value}</li>`
  15.       todo.value = ''
  16.       add.innerText = `Add #${++count}`
  17.     }
  18.   }
  19. </script>

I don’t really like React… Don’t get me wrong, I don’t mind it and I even kind of like using it – there’s something fun about it… But it’s surprising to me that UI work is still so bulky… I think React and most other UI libraries are overly complex… Every now and then I do evil style vanilla js versions of the React homepage examples as a sort of rebellion 😀 This is the React version of the above snippet:

  1. class TodoApp extends React.Component {
  2.   constructor(props) {
  3.     super(props);
  4.     this.state = { items: [], text: '' };
  5.     this.handleChange = this.handleChange.bind(this);
  6.     this.handleSubmit = this.handleSubmit.bind(this);
  7.   }
  8.  
  9.   render() {
  10.     return (
  11.       <div>
  12.         <h3>TODO</h3>
  13.         <TodoList items={this.state.items} />
  14.         <form onSubmit={this.handleSubmit}>
  15.           <label htmlFor="new-todo">
  16.             What needs to be done?
  17.           </label>
  18.           <input
  19.             id="new-todo"
  20.             onChange={this.handleChange}
  21.             value={this.state.text}
  22.           />
  23.           <button>
  24.             Add #{this.state.items.length + 1}
  25.           </button>
  26.         </form>
  27.       </div>
  28.     );
  29.   }
  30.  
  31.   handleChange(e) {
  32.     this.setState({ text: e.target.value });
  33.   }
  34.  
  35.   handleSubmit(e) {
  36.     e.preventDefault();
  37.     if (this.state.text.length === 0) {
  38.       return;
  39.     }
  40.     const newItem = {
  41.       text: this.state.text,
  42.       id: Date.now()
  43.     };
  44.     this.setState(state => ({
  45.       items: state.items.concat(newItem),
  46.       text: ''
  47.     }));
  48.   }
  49. }
  50.  
  51. class TodoList extends React.Component {
  52.   render() {
  53.     return (
  54.       <ul>
  55.         {this.props.items.map(item => (
  56.           <li key={item.id}>{item.text}</li>
  57.         ))}
  58.       </ul>
  59.     );
  60.   }
  61. }
  62.  
  63. root.render(<TodoApp />);
// dom // globals // hacks // humor // ui
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