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60 lines (52 loc) · 1.55 KB
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<h1>Heading with a <span>span</span> element.</h1>
<p>A paragraph with <span>one</span>, <span>two</span>
spans.</p>
<script>
function byTagName(node, tagName) {
function check(node, tagName) {
if (node.nodeType !== document.ELEMENT_NODE) return;
for (var i = 0; i < node.childNodes.length; i++) {
var nodeChild = node.childNodes[i];
if (nodeChild.nodeType == document.ELEMENT_NODE) {
if (nodeChild.tagName.toLowerCase() === tagName.toLowerCase())
elements.push(nodeChild);
check(nodeChild, tagName);
}
}
}
var elements = [];
check(node, tagName);
return elements;
}
console.log(byTagName(document.body, "h1").length);
// => 1
console.log(byTagName(document.body, "span").length);
// => 3
var para = document.querySelector("p");
console.log(byTagName(para, "span").length);
// => 2
</script>
/*
<h1>Heading with a <span>span</span> element.</h1>
<p>A paragraph with <span>one</span>, <span>two</span>
spans.</p>
<script>
function byTagName(node, tagName) {
var elements = [];
var all = document.getElementsByTagName(tagName);
Array.prototype.forEach.call(all, function(element){
if(node.contains(element)) {
elements.push(element);
}
});
return elements;
}
console.log(byTagName(document.body, "h1").length);
// => 1
console.log(byTagName(document.body, "span").length);
// => 3
var para = document.querySelector("p");
console.log(byTagName(para, "span").length);
// => 2
</script>
*/