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Automatically Line Number a Code Snippet

Posted on 2014-10-08
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Last Modified: 2014-10-09
Given this small bit of HTML, what can I do to get the browser to render the <pre> section with line numbers?  I would also like a "Select All" functionality for the lines (but not the numbers) just below the <pre> block.  What I'm looking for is something like the way E-E handles code snippets.

<html>
<p>
Here is a code snippet
</p>
<pre>
<?php
error_reporting(E_ALL);
echo "Hello World."
</pre>
<p>
This is the end of the HTML
</p>
</html>

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Thanks and regards, ~Ray
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Question by:Ray Paseur
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Assisted Solution

by:Gary
Gary earned 250 total points
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Without using a plugin

http://jsfiddle.net/qwfceypr/3/

HTML
<pre>
Code line 1
    Code line 2
    Code line 3
</pre>
<div class="code">
    <ol></ol>
</div>

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CSS
ol li {
    content: counter(listing)". ";
    font-family:monospace
}

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jQuery
var code = [];

lines = $("pre").text().split("\n")
lines.forEach(function (line) {
    code.push('<li>' + line + '</li>');
});
$("pre").hide()
$(".code ol").append(code)

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edited
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by:COBOLdinosaur
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Clever, but that is not what EE is doing.  

What looks like a text area is actually a div with child pre ans code tags.  The content is in a pre tag with a left margin of 55px.  the line numbers are in a pre that is absolutely positioned, the matching to have the line numbers with the number of lines in the text would be part of server side generation.

The select is simple scripting, targeting the pre with the text by is or element index, and applying a select method.

Cd&
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by:Gary
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Yeah but EE has a 1000 lines of code to do the same thing ;o)
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leakim971 earned 250 total points
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by:COBOLdinosaur
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Yeah but EE has a 1000 lines of code to do the same thing

That is because SLO has either never heard of KISS or rejects the concept.  I think it is part of the JAVA programmer mindset that you need to keep things complex and obfuscated so you are the only one who can maintain it; job security.

I never said what they were doing was not crappy, I just describe the junk they were pushing out... but I need to be careful about what I say because the last time I criticized the level of their technical quality, I was censored, sanctioned and turfed out of the TA program I helped start, because the SLO drones were offended.

Cd&
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by:Gary
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Forgot to account for html tags
http://jsfiddle.net/qwfceypr/7/
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by:COBOLdinosaur
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Not complex enough for SLO to use.  You need at least 3 jquery libraries, 40 classes, and (at a minimum) 250 more lines of code.  Plus nothing is worth doing on the server that does not require 200 lines of code and use 15 methods and 6+ accesses to the DB.

However it does support what I have said in the past about the code being put on on EE is an embarrassment to those of us answering webdev questions.  Some of the users think we help write that junk.

Cd&
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by:COBOLdinosaur
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BTW validation of this page = 17 errors including duplicate id  :^(

Cd&
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by:Gary
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Even if you don't want to do it client side the same logic and code can be applied in PHP.
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Author Comment

by:Ray Paseur
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@Cd&  Also, E-E seems to have lost the line numbers in the Articles, even if they are still available in the Questions.  That said, I'm OK with solutions that are conceptually similar (and simpler) than whatever E-E is using.  Thanks to all, ~Ray
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Author Closing Comment

by:Ray Paseur
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Thanks, colleagues.  This will get me moving forward!
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by:COBOLdinosaur
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I interpreted the question to be asking how they were doing it, so you could move in a similar fashion.  

I was not suggesting that you do anything like EE does it.  From a technical standpoint it is one of the worse coded large sites on the internet.  It is slower than the majority of sites; severely bloated because of the excessive client side scripting, and excessive structure bound css; and I have yet to see a single EE page that actually validates.

If someone asking a question posted a link to a page that was coded like an EE page I suspect most of us would insist that the clean up the code as a start.

The code box is actually a good example of re-inventing the wheel with a ton of code. They could do it without all the nested element crap with the proper tag (textbox) set readonly and the positioned line number div.

the css for selected text is

::selection {
    color: white;
    background: navy;
}

And the link just needs to fire an event that does something like:
document.getElementById("myText").select();

You don't need the css if you want it to look default.

It makes sense to me that the whole thing including the line numbers gets done on the server, because you have to go there to process the input and update the database anyway, so why not save the the line count in the same table/row as the code text and then when you generate the display of the Q the line count is a no brainer that reduces client side bloat.

Cd&
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Author Comment

by:Ray Paseur
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@Cd&, yes, I take your point.  We've discussed the HTML document validity and lack thereof with the folks in SLO.  I'm hoping they "get it" and will move in the direction that we all know they should.

In my instance, all I really need is the numbered effect and I'm using flat-file HTML pages, so I will be fine tweaking the examples here.  Your suggestions are helpful, too.  I know a lot about PHP, but I'm a relative novice when it comes to document markup.  I may wimp out and switch all of this over to a Wordpress blog, anyway!

best regards, ~Ray
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