I have a WebView class and I want to select specific text from the rendered html code in a specific region.

Method: public static void selectTextInWebView(WebView webView, int startIndex, int endIndex)

I tried to write a JS code but it doesn’t work.

        String script = "function selectRange(start, end) {" +
                "    var range = document.createRange();" +
                "    var selection = window.getSelection();" +
                "    var walker = document.createTreeWalker(document.body, NodeFilter.SHOW_TEXT, null, false);" +
                "    var charCount = 0;" +
                "    var startNode, endNode, startOffset, endOffset;" +
                "    while (walker.nextNode()) {" +
                "        var node = walker.currentNode;" +
                "        var nextCharCount = charCount + node.length;" +
                "        if (!startNode && nextCharCount > start) {" +
                "            startNode = node;" +
                "            startOffset = start - charCount;" +
                "        }" +
                "        if (nextCharCount >= end) {" +
                "            endNode = node;" +
                "            endOffset = end - charCount;" +
                "            break;" +
                "        }" +
                "        charCount = nextCharCount;" +
                "    }" +
                "    if (startNode && endNode) {" +
                "        range.setStart(startNode, startOffset);" +
                "        range.setEnd(endNode, endOffset);" +
                "        selection.removeAllRanges();" +
                "        selection.addRange(range);" +
                "    }" +
                "}" +
                "selectRange(" + startIndex + ", " + endIndex + ");";
        webView.getEngine().executeScript(script);