使用位置值以编程方式选择div中的文本属于该文本

Question

I have a div and there is a text in it.I want a part of that text to be selected programmatically according position value of characters.

<div id="textdiv">
Hello world. I am a friend.
</div>

I want "llo world" part to be selected( I mean highlighted/selected like making selection of content in an input/textarea ). In that case position values are first (3) and last (10).

How can i do that programmatically using position values?

Answer 1

Here is a simple way to to this:

 function selectTextRange(obj, start, stop) { var endNode, startNode = endNode = obj.firstChild startNode.nodeValue = startNode.nodeValue.trim(); var range = document.createRange(); range.setStart(startNode, start); range.setEnd(endNode, stop + 1); var sel = window.getSelection(); sel.removeAllRanges(); sel.addRange(range); } selectTextRange(document.getElementById('textdiv'), 3, 10); 

 <div id="textdiv"> Hello world. I am a friend. </div> 

---

Text highlight:

 function highlightRange(el, start, end) { var text = el.textContent.trim() el.innerHTML = text.substring(0, start) + '<span style="background:yellow">' + text.substring(start, end) + "</span>" + text.substring(end); } highlightRange(document.getElementById("textdiv"), 3, 10) 

 <div id="textdiv"> Hello world. I am a friend. </div> 

Answer 2

Code without any error checking ahead. Use at your own risk!

 function highlight(pattern) { var text = $("#textdiv").text(); var around = text.split(pattern); $("#textdiv").html(around[0] + "<span class='highlight'>" + pattern + "</span>" + around[1]); } $(document).ready(function() { highlight("world"); }) 

 .highlight { background-color: yellow; } 

 <script src="https://code.jquery.com/jquery-2.2.0.min.js"></script> <div id="textdiv"> Hello world. I'm Hugo! </div> 

Answer 3

Try using .html() , String.prototype.slice() . To select "llo world" call .slice() with parameters 3, 12

 $("#textdiv").html(function(i, html) { var selected = html.slice(3, 12); return html.replace(new RegExp("("+selected+")"), "<mark>$1</mark>") }) 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"> </script> <div id="textdiv"> Hello world. I am a friend. </div>