Codepen Picks
Here are a few cool codepen picks:
by Kenji Saito
by Bennett Feely
by Gerard Ferrandez
Programming
Here are a few cool codepen picks:
by Kenji Saito
by Bennett Feely
by Gerard Ferrandez
…
See the Pen KaTex Superformula by Zevan Rosser (@ZevanRosser) on CodePen.
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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 | <!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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | 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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | <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.