Professional JavaScript for Web Developers by Matt Frisbie

Author:Matt Frisbie
Language: eng
Format: epub, azw3, pdf
ISBN: 9781119366577
Publisher: Wiley
Published: 2019-10-15T00:00:00+00:00

With the exception of NodeFilter.SHOW_ALL, you can combine multiple options using the bitwise OR operator, as shown in the following example:

let whatToShow = NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_TEXT;

The filter argument of createNodeIterator() can be used to specify a custom NodeFilter object or a function that acts as a node filter. A NodeFilter object has only one method, acceptNode(), which returns NodeFilter.FILTER_ACCEPT if the given node should be visited or NodeFilter.FILTER_SKIP if the given node should not be visited. Because NodeFilter is an abstract type, it's not possible to create an instance of it. Instead, just create an object with an acceptNode() method and pass the object into createNodeIterator(). The following code accepts only <p> elements:

let filter = { acceptNode(node) { return node.tagName.toLowerCase() == "p" ? NodeFilter.FILTER_ACCEPT : NodeFilter.FILTER_SKIP; } }; let iterator = document.createNodeIterator(root, NodeFilter.SHOW_ELEMENT, filter, false);

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