Archiv der Kategorie ‘html5‘

 
 

Codepen Picks

Here are a few cool codepen picks:

by Kenji Saito

by Bennett Feely

by Gerard Ferrandez

Playing Around with KaTex

See the Pen KaTex Superformula by Zevan Rosser (@ZevanRosser) on CodePen.

JavaScript Framework Thoughts Part 3

Today I had a chance to write the first proof of concept for the templating idea mentioned in part 2 of this post series. Really didn’t expect to get it working so quick but here it is:

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <title></title>
    <script src="http://code.jquery.com/jquery-latest.min.js"></script>
    <script src="obj.js"></script>
    <script>
      $(function(){
 
        var data = {
          title : 'cool',
          titleStyle : 'color : red',
          some : { 
            nested : {
              prop : 'you got it'
            }
          },
          checked : false,
          items : [
            {value : 1},
            {value : 2},
            {value : 3}
          ], 
          files : [
            {id : 123, fileName : 'one'},
            {id : 321, fileName : 'two'},
            {id : 111, fileName : 'three'},
            {id : 222, fileName : 'four'}
          ],
          names : [
            'joe',
            'moe',
            'abe'
          ],
          collection : [
            { title : 'first', 
              things : [
                {thing : 'thing 1'},
                {thing : 'thing 2'},
                {thing : 'thing 3'}
              ]
             },
            { title : 'second', 
              things : [
                {thing : 'thing a'},
                {thing : 'thing b'},
                {thing : 'thing c'}
              ]
             }
          ]
        };
 
 
        var Template = function(html, data) {
          var div = document.createElement('div');
 
          this.isVar = /\s?^\*+/;
          this.isCollection = /^data/;
 
          div.innerHTML = html;
 
          this.traverse(div, data);
 
          document.body.appendChild(div);
        };
 
        Template.prototype = {
          constructor : Template,
          resolveVar : function(path, ctx, index){
            var curr;
            if (path === '*'){
              return ctx;
            }else{ 
              path = path.replace(/^\*/,'').split('.');
              curr = ctx;
 
              for (var i = 0; i < path.length; i++){
                curr = curr[path[i]];
              }
 
              if (curr) {
                return curr;
              } else {
                return false;
              }
            }
          },
 
          traverse : function(parent, scope, index, noChildren){
            var i, j, k, attr, val, varValue, node, tempEl, 
                oldScope, newScope, collection, newHTML, collectionItem;
 
            if (parent.attributes) {
              for (i = 0; i < parent.attributes.length; i++){
                attr = parent.attributes[i];
                if (attr.nodeValue.match(this.isVar)){
                  val = this.resolveVar(attr.nodeValue, scope, index); 
                  if (val === false || val === ''){
                    parent.attributes.removeNamedItem('checked');
                  } else {
                    parent.setAttribute(attr.name, this.resolveVar(attr.nodeValue, scope, index));
                  }
                }
              }
            }
 
            if (!parent.innerHTML) { return; }
 
            if (parent.innerHTML.match(this.isVar)){
              varValue = this.resolveVar(parent.innerHTML, scope, index);
              if (varValue){
                parent.innerHTML = varValue; 
              } 
            }
 
            for (var i = 0; i < parent.childNodes.length; i++){
              node = parent.childNodes[i];
 
              if (node.attributes){
                for(j = 0; j < node.attributes.length; j++){
                  attr = node.attributes[j];
                  if (attr.name.match(this.isCollection)){
 
                    tempEl = document.createElement('div');
                    tempEl.innerHTML = node.innerHTML;
                    oldScope = scope;
                    newScope = attr.name.replace('data-','');
                    collection = scope[newScope];
 
                    if (collection){
                      newHTML = "";
                      node.innerHTML = "";
                      for (var k = 0; k < collection.length; k++){
                        collectionItem = document.createElement('div');
                        collectionItem.innerHTML = tempEl.innerHTML;
 
                        this.traverse(collectionItem, collection[k], k); 
                        newHTML += collectionItem.innerHTML;
                      } 
                      node.innerHTML = newHTML;
                    } 
                    scope = oldScope;
                  }
                } 
 
              }
 
              if (node.childNodes.length > 0) {  
                if (node.nodeType === 3){ return; }
                this.traverse(node, scope, index);
              } else {
                this.traverse(node, scope, index, noChildren);
              }
            }
          }
        };
 
        var template = new Template($('#tmpl').html(), data);
 
      });
    </script>
    <style>
      body,html{
        font-family : sans-serif; 
      }
      .thing{
        border : 1px solid red; 
        padding : 5px;
      }
    </style>
  </head>
  <body> 
    <script id="tmpl" type="text/html">
      <div class="app">
 
        <h2 style="*titleStyle">*title</h2>
 
        <p>*some.nested.prop</p>
 
        <form>
          <input type="checkbox" checked="*checked">
        </form>
 
        <ul data-items>
          <li>*value</li>
        </ul>
 
        <h3>Files:</h3><hr>
        <select data-files>
          <option value="*id">*fileName</option>
        </select>
 
        <h3>Names:</h3><hr>
        <div data-names>
          <b>*</b>
          <div class="name">*</div>
        </div>
 
        <h3>Things:</h3><hr>
        <div data-collection>
          <div class='thing'>
            <h2>*title</h2>
            <div data-things>
              <p>*thing</p>
            </div>
          </div>
        </div>
 
      </div> 
    </script>
  </body>
</html>

So this takes data like this:

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var data = {
  title : 'cool',
  titleStyle : 'color : red',
  some : { 
    nested : {
      prop : 'you got it'
    }
  },
  checked : false,
  items : [
    {value : 1},
    {value : 2},
    {value : 3}
  ], 
  files : [
    {id : 123, fileName : 'one'},
    {id : 321, fileName : 'two'},
    {id : 111, fileName : 'three'},
    {id : 222, fileName : 'four'}
  ],
  names : [
    'joe',
    'moe',
    'abe'
  ],
  collection : [
    { title : 'first', 
      things : [
        {thing : 'thing 1'},
        {thing : 'thing 2'},
        {thing : 'thing 3'}
      ]
     },
    { title : 'second', 
      things : [
        {thing : 'thing a'},
        {thing : 'thing b'},
        {thing : 'thing c'}
      ]
     }
  ]
};

and a template like this:

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<div class="app">
  <h2 style="*titleStyle">*title</h2>
 
  <p>*some.nested.prop</p>
 
  <form>
    <input type="checkbox" checked="*checked">
  </form>
 
  <ul data-items>
    <li>*value</li>
  </ul>
 
  <h3>Files:</h3><hr>
  <select data-files>
    <option value="*id">*fileName</option>
  </select>
 
  <h3>Names:</h3><hr>
  <div data-names>
    <b>*</b>
    <div class="name">*</div>
  </div>
 
  <h3>Things:</h3><hr>
  <div data-collection>
    <div class='thing'>
      <h2>*title</h2>
      <div data-things>
        <p>*thing</p>
      </div>
    </div>
  </div>
 
</div>

and renders like this:

See the Pen mydVay by Zevan Rosser (@ZevanRosser) on CodePen.

The real trick here is the collections, that is, when the data has an array of objects this takes the existing nodes out of the element that needs to be the parent of a collection of elements, duplicates it and fills in the values as it goes.

This code needs some refactoring and possibly the addition of document fragments to speed it up a bit. Also there are a couple things that need to be figured out in terms of flexibility of the templates. Like, is it ok to do:

<h2>*variableA is a weird *variableB</h2>

This can get kind of hairy so I might just avoid it, forcing only vars and spaces to be able to be defined inside nodeValues… not sure yet…

<h2>*variableA *variableB</h2>

Next step is to combine this with the Watch class from Part 1 of this post series.