Most commercial systems I've worked with implement this in a much simpler manner: by simply adding a datestamp to the row in question. When you render the edit form, include the datestamp as a hidden field. When the user submits the update, compare the datestamp with the one in the row. If the row contains a newer one, there's a overwrite issue. Ask user to confirm they want to overwrite, maybe give them some idea what's changed. Bonus points for using ajax to notify open clients of the row change while they're editing the records. I think this is orders of magnitude simpler than your attempt to reinvent client/server locking behavior in the browser (which might just be a first - which should scare you), and it's backed up by lots of prior art, so you know it will work.

In reply to Re^3: Re: Implementing rowlocking (there's a better way) by Anonymous Monk
in thread Implementing rowlocking by oyse

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.