How to mimic JS ranges/selections with divs as backgrounds?
I need to mimic ranges/selections (those that highlight content on a website, and when you press for ex CTRL + C
you copy the content) with divs as backgrounds. Chances are that the "highlighting divs开发者_开发问答" will be position:absolute;
<div id="highlight">
<!-- The highlightor divs would go here -->
</div>
<div id="edit">
<!-- The divs to be highlighted (that have text) would go here -->
</div>
Edit: Functionalities such as copying are essential.
PS: If you're curious about "why", refer to this question. I created a new question because I felt the old one was pretty much answered, and this one differed to much from that one.
Here's the concept, with some code to get you started. Every time text is selected in the page, append that text to a hidden textarea on the page and then select the textarea. Then, wrap the original selection in a span to make it look selected. This way, you have the appearance of a selection, and since the hidden textarea is actually selected, when the user hits "ctrl+c" they are copying the text from the textarea.
To get the full functionality you are looking for, you'll probably want to extend this. Sniff keys for "ctrl+a" (for select all). I don't think you'll be able to override right-click behavior... at least not easily or elegantly. But this much is at least a proof of concept for you to run with.
window.onload = init;
function init()
{
document.getElementById("hidden").value = "";
document.body.ondblclick = interceptSelection;
document.body.onmouseup = interceptSelection;
}
function interceptSelection(e)
{
e = e || window.event;
var target = e.target || e.srcElement;
var hidden = document.getElementById("hidden");
if (target == hidden) return;
var range, text;
if (window.getSelection)
{
var sel = getSelection();
if (sel.rangeCount == 0) return;
range = getSelection().getRangeAt(0);
}
else if (document.selection && document.selection.createRange)
{
range = document.selection.createRange();
}
text = "text" in range ? range.text : range.toString();
if (text)
{
if (range.surroundContents)
{
var span = document.createElement("span");
span.className = "selection";
range.surroundContents(span);
}
else if (range.pasteHTML)
{
range.pasteHTML("<span class=\"selection\">" + text + "</span>")
}
hidden.value += text;
}
hidden.select();
}
Here's the css I used in my test to hide the textarea and style the selected text:
#hidden
{
position: fixed;
top: -100%;
}
.selection
{
background-color: Highlight;
color: HighlightText;
}
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