Changing CSS of Selected Text with JavaScript
In an effort to create a bookmarklet that highlights selected text on a webpage, a developer encountered an issue where the jQuery code used to change the CSS of the selected text wasn't working.
Original Attempt:
The attempted code used the following function:
function highlightSelText() { var SelText; if (window.getSelection) { SelText = window.getSelection(); } else if (document.getSelection) { SelText = document.getSelection(); } else if (document.selection) { SelText = document.selection.createRange().text; } $(SelText).css({'background-color' : 'yellow', 'font-weight' : 'bolder'}); }
The Solution:
The issue with the original code arose from the inability of jQuery to directly modify the CSS of selected text. A more effective approach is to utilize the execCommand() method, which offers a command to alter the background color in various modern browsers.
The following code demonstrates how to highlight any text selection:
function makeEditableAndHighlight(colour) { var range, sel = window.getSelection(); if (sel.rangeCount && sel.getRangeAt) { range = sel.getRangeAt(0); } document.designMode = "on"; if (range) { sel.removeAllRanges(); sel.addRange(range); } if (!document.execCommand("HiliteColor", false, colour)) { document.execCommand("BackColor", false, colour); } document.designMode = "off"; } function highlight(colour) { var range, sel; if (window.getSelection) { // IE9 and non-IE try { if (!document.execCommand("BackColor", false, colour)) { makeEditableAndHighlight(colour); } } catch (ex) { makeEditableAndHighlight(colour) } } else if (document.selection && document.selection.createRange) { // IE <= 8 case range = document.selection.createRange(); range.execCommand("BackColor", false, colour); } }
This updated code successfully changes the background color of the selected text, regardless of whether the selection spans multiple elements.
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