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JavaScript - iterate text nodes only in DOM tree

5 points
Created by:
Dragontry
371

In this short article, we want to show how to iterate over text nodes using JavaScript.

Iterate over text nodes using JavaScript.
Iterate over text nodes using JavaScript.

Practical example:

// ONLINE-RUNNER:browser;

const walkTextNodes = (node, filter) => {
    const result = [];
    const execute = node => {
        let child = node.firstChild;
        while (child) {
            switch (child.nodeType) {
                case Node.TEXT_NODE:
                    if (filter(child)) {
                        result.push(child);
                    }
                    break;
                case Node.ELEMENT_NODE:
                    execute(child);
                    break;
            }
            child = child.nextSibling;
        }
    }
    if (node) {
        execute(node);
    }
    return result;
}


// Usage example:

const container = document.createElement('div');
container.innerHTML = `<p>This <u>is</u> example <b>text</b>.</p>`;

const filter = node => { // this filter removes text nodes that contains white characters only
    return /^(\s|\n)+$/gi.test(node.data) ? false : true;
};

const nodes = walkTextNodes(container, filter); // 5 text nodes

for (const node of nodes) {
    console.log(node.data);
}
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