Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>There are different costs, let's look at them:</p> <pre><code>$('#mybutton').live('click', function(e){ doSomething(); }); </code></pre> <p>There are 2 main costs here:</p> <ul> <li>The <code>#mybutton</code> selector needs to run immediately for no reason (the result is thrown away, we just wanted the selector anyway...we're binding to <code>document</code>). In this case it's an <a href="http://api.jquery.com/id-selector/" rel="nofollow"><code>#id</code> selector</a> so that's a very low cost...in other cases it's not cheap and very wasteful (for example <code>[attr=something]</code>).</li> <li>Every <code>click</code> that bubbles up to <code>document</code> now has to be checked against this selector, a per-click evaluation cost, this varies with the number of clicks you expect.</li> </ul> <hr> <p>Now let's look at the other method:</p> <pre><code>$('#mybutton').click(function(e){ doSomething(); }); </code></pre> <p>There are 2 main costs here as well:</p> <ul> <li>The <code>#mybutton</code> selector runs, but only once per ajax request. However, we're not wasting it, we're using the results.</li> <li>The <code>click</code> handler is bound to an actual element, rather than <code>document</code>, so there's a binding cost <em>each</em> time it runs, rather than once</li> </ul> <p>However, there's no per-click cost and the selector call itself isn't wasted...so it's better overall, <em>since you're using an ID</em>, this isn't true in other cases.</p> <hr> <p>In your case, since you're dealing with an ID (and guaranteed a single element), <strong>this is much cheaper</strong>:</p> <pre><code>$('#mybutton').click(function(e){ doSomething(); }); </code></pre> <p>In other cases, where you're binding hundreds of elements, <a href="http://api.jquery.com/live/" rel="nofollow"><code>.live()</code></a> is the clear winner, though <a href="http://api.jquery.com/delegate/" rel="nofollow"><code>.delegate()</code></a> would be even better. </p>
    singulars
    1. This table or related slice is empty.
    1. POjQuery performance: $('#selector').live() vs manually bind (when working with ajax requests)
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USNick Craver
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POjQuery performance: $('#selector').live() vs manually bind (when working with ajax requests)
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COAccording to 'http://api.jquery.com/live/' the live method can work on elements not yet added to the dom. So in his case unless the click handler actually changes he can just set it up once. So there are some gains to be had there. Also, with JQ1.4 he can stop it bubbling up to the top of the tree.
      singulars
      1. PO
      1. USSimon
    2. COnice answer. Could you explain what you mean with "rather than document"?
      singulars
      1. PO
      1. USnemesisdesign
    3. CO@nemesis: @Nick means the `document` object, the container for all the elements on the page. `live` events are bound there so they can catch the events no matter where they occur on the page.
      singulars
      1. PO
      1. USAndy E
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload