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I'm trying to make a js code that works with multiple pages. I'm trying to use querySelectorAll() to obtain the elements form the DOM.
I need the elements to be ordered. In order to do that I may use xPath or selectors (I'd prefer to use selectors but xPath is also ok). The problem is:
Are the elements in the NodeList returned by querySelectorAll() ordered against the order that the tags appear in the HTML?
Note: I'd like to add the tag: querySelectorAll
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The querySelectorAll() methods on the Document , DocumentFragment , and Element interfaces must return a NodeList containing all of the matching Element nodes within the subtrees of the context node, in document order. If there are no matching nodes, the method must return an empty NodeList .
The querySelectorAll() method in HTML is used to return a collection of an element's child elements that match a specified CSS selector(s), as a static NodeList object. The NodeList object represents a collection of nodes. The nodes can be accessed by index numbers.
The querySelectorAll() method returns all elements that matches a CSS selector(s). The querySelectorAll() method returns a NodeList.
The querySelectorAll method returns an array-like object called a node list. These data structures are referred to as “Array-like”, because they appear as an array, but can not be used with array methods like map and forEach .
The returned node list is ordered. A quick test proved it:
document.querySelectorAll("body, head")[0]; //Returned [object HTMLHeadElement] Obviously, the <head> tag appears before <body> in a HTML document. The first element of the NodeList is also a <head> element, even if the selector shows body before `head.
From http://www.w3.org/TR/selectors-api/#queryselectorall:
The
querySelectorAll()method on the NodeSelector interface must, when invoked, return a NodeList containing all of the matching Element nodes within the node’s subtrees, in document order. If there are no such nodes, the method must return an empty NodeList.
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