How to Get the Word Under the Mouse Cursor with JavaScript?
Oct 26, 2024 am 07:06 AM
How to Retrieve the Word Underneath the Cursor with JavaScript
Determine the word being hovered over by the mouse cursor is an essential task for text-based applications. Suppose you have an HTML page with a paragraph of text:
<code class="html"><p> some long text </p></code>
How can you identify that the cursor is positioned above the word "text"? This article presents a solution that caters specifically to Chrome (and potentially Firefox).
JavaScript Implementation:
<code class="javascript">function getWordAtPoint(elem, x, y) {
if (elem.nodeType == elem.TEXT_NODE) {
// Create a range and position it within the element's text content
var range = elem.ownerDocument.createRange();
range.selectNodeContents(elem);
// Initialize position variables
var currentPos = 0;
var endPos = range.endOffset;
// Iterate through the text content
while (currentPos + 1 < endPos) {
// Update the range to select a single character
range.setStart(elem, currentPos);
range.setEnd(elem, currentPos + 1);
// Check if the character's bounding rectangle contains the cursor position
if (
range.getBoundingClientRect().left <= x &&
range.getBoundingClientRect().right >= x &&
range.getBoundingClientRect().top <= y &&
range.getBoundingClientRect().bottom >= y
) {
// Expand the range to select the word
range.expand("word");
var ret = range.toString();
range.detach();
return ret;
}
// Advance the current position
currentPos += 1;
}
} else {
// For elements with child nodes (e.g., <p>, <div>), iterate through their children
for (var i = 0; i < elem.childNodes.length; i++) {
// Create a range and position it within the child node's text content
var range = elem.childNodes[i].ownerDocument.createRange();
range.selectNodeContents(elem.childNodes[i]);
// Check if the child node's bounding rectangle contains the cursor position
if (
range.getBoundingClientRect().left <= x &&
range.getBoundingClientRect().right >= x &&
range.getBoundingClientRect().top <= y &&
range.getBoundingClientRect().bottom >= y
) {
// Recursively call getWordAtPoint on the child node
range.detach();
return getWordAtPoint(elem.childNodes[i], x, y);
} else {
range.detach();
}
}
}
return null;
}</code>
Usage:
In the event handler for your mousemove event, you can utilize the getWordAtPoint() function as follows:
<code class="javascript">getWordAtPoint(e.target, e.x, e.y);</code>
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