|
| 1 | +<h1>Heading with a <span>span</span> element.</h1> |
| 2 | +<p>A paragraph with <span>one</span>,<span>two</span> |
| 3 | + spans.</p> |
| 4 | + |
| 5 | +<script> |
| 6 | + function byTagName(node, tagName) { |
| 7 | + function check(node, tagName) { |
| 8 | + if (node.nodeType !== document.ELEMENT_NODE) return; |
| 9 | + for (var i = 0; i < node.childNodes.length; i++) { |
| 10 | + var nodeChild = node.childNodes[i]; |
| 11 | + if (nodeChild.nodeType == document.ELEMENT_NODE) { |
| 12 | + if (nodeChild.tagName.toLowerCase() === tagName.toLowerCase()) |
| 13 | + elements.push(nodeChild); |
| 14 | + check(nodeChild, tagName); |
| 15 | + } |
| 16 | + } |
| 17 | + } |
| 18 | + |
| 19 | + var elements = []; |
| 20 | + check(node, tagName); |
| 21 | + return elements; |
| 22 | + } |
| 23 | + |
| 24 | + console.log(byTagName(document.body, "h1").length); |
| 25 | + // => 1 |
| 26 | + console.log(byTagName(document.body, "span").length); |
| 27 | + // => 3 |
| 28 | + var para = document.querySelector("p"); |
| 29 | + console.log(byTagName(para, "span").length); |
| 30 | + // => 2 |
| 31 | +</script> |
| 32 | + |
| 33 | +/* |
| 34 | +<h1>Heading with a <span>span</span> element.</h1> |
| 35 | +<p>A paragraph with <span>one</span>, <span>two</span> |
| 36 | + spans.</p> |
| 37 | + |
| 38 | +<script> |
| 39 | + function byTagName(node, tagName) { |
| 40 | + var elements = []; |
| 41 | + var all = document.getElementsByTagName(tagName); |
| 42 | + |
| 43 | + Array.prototype.forEach.call(all, function(element){ |
| 44 | + if(node.contains(element)) { |
| 45 | + elements.push(element); |
| 46 | + } |
| 47 | + }); |
| 48 | + |
| 49 | + return elements; |
| 50 | + } |
| 51 | + |
| 52 | + console.log(byTagName(document.body, "h1").length); |
| 53 | + // => 1 |
| 54 | + console.log(byTagName(document.body, "span").length); |
| 55 | + // => 3 |
| 56 | + var para = document.querySelector("p"); |
| 57 | + console.log(byTagName(para, "span").length); |
| 58 | + // => 2 |
| 59 | +</script> |
| 60 | +*/ |
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