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Last active Aug 29, 2015

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Check if node is child of a selection of nodes

isChildOf

A small snippet to determine if a node is child of any one of a selection of nodes.

isChildOf(node, selection) // -> true/false

function(
t, // target
s, // selected nodes
p, // placeholder for target/parents
i, // counter
o // placeholder for "ownerDocument"
){
// iterate over selection
for (i = 0; i < s.length; i++)
for(
// check if the selected node is in the same DOM as the target,
// otherwise set p to false to stop this loop from iterating the parentNodes
p = t[o='ownerDocument'] === s[i][o] && t;
p; // continue iteration as long as parentNodes are present
p = p.parentNode)
// found a match? return true
if (p === s[i])
return!0;
// nothing found? return false
return!1
}
function(t,s,p,i,o){for(i=0;i<s.length;i++)for(p=t[o='ownerDocument']===s[i][o]&&t;p;p=p.parentNode)if(p===s[i])return!0;return!1}
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
Version 2, December 2004
Copyright (C) 2011 Alex Lohr (formerly Kloss) alexthkloss@web.de
Everyone is permitted to copy and distribute verbatim or modified
copies of this license document, and changing it is allowed as long
as the name is changed.
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. You just DO WHAT THE FUCK YOU WANT TO.
{
"name": "isChildOf",
"description": "Check if node is child of a selection of nodes",
"keywords": [
"node",
"child",
"selection",
"DOM"
]
}
<!DOCTYPE html>
<title>Foo</title>
<div>Expected value: <b>true</b></div>
<div>Actual value: <b id="ret"></b></div>
<script>
// write a small example that shows off the API for your example
// and tests it in one fell swoop.
var myFunction = function(t,s,p,i,o){for(i=0;i<s.length;i++)for(p=t[o='ownerDocument']===s[i][o]&&t;p;p=p.parentNode)if(p===s[i])return!0;return!1}
document.getElementById( "ret" ).innerHTML = myFunction(document.getElementById( "ret" ), document.getElementsByTagName('div'));
</script>
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