What is causing the inconsistency and instability in this jQuery sortable configuration?

I have created a page where users can interact with green blocks by dragging and re-ordering them from one sliding area to another. Sometimes, however, the dropping and sorting functionality is unreliable. The boxes may align incorrectly or the drop area might disappear altogether.

When I drag the top left block, it causes the lower block to jump to the other side. This issue seems to be related to the placeholder option in the JavaScript code.

Another concern is that sometimes the placeholder does not even show when dragging a block from the right area to the left.

To address some of these issues, I had to use 

$( "#areaOne, #areaTwo" ).sortable( "refresh" );
in the code, but it still doesn't fully resolve the problem.

If you have any ideas on how to fix these unpredictable sortable issues, please let me know!

You can view the live code here.

UPDATE:

By removing the border from the placeholder class, I was able to eliminate the 'jumping' issue. However, the problem of the placeholder disappearing persists when dragging a block between areas. It seems like the scrolling behavior triggers this issue.

Upon inspecting the live HTML code, I noticed that when the placeholder vanishes, it actually jumps back to its original area of origin.

You can find the updated code here.

Here is a screen recording demonstrating the current problem: Watch here.

Your input on resolving these challenges would be greatly appreciated. Thank you.

jquerycssjquery-uijquery-ui-sortable

Answer №1

Jquery Sort is incredibly dependable.

The issue you are facing with the cycle plugin is that it sets out of view divs to 'display:none', effectively removing them from dom calculations instead of just hiding them. It's unnecessary to keep appending and refreshing sortable to resolve this issue. This approach becomes even more unstable while sorting because you are refreshing without a proper state.

Instead of relying on the cycle plugin, I recommend placing both connected sortable areas inside a wrapper with 'overflow:hidden'. You can then animate these areas using the 'margin-left' property. Since you are already checking for object positions during sort, transitioning to this method should not be a problem. Simply use your existing if block to include the $.animate function rather than constantly appending, refreshing, and triggering click events.

I have provided a demonstration of this concept by forking your fiddle (please note that the code is not complete, but it resolves your issue).

http://jsfiddle.net/dHZe9/

Cheers!

Answer №2

Recently, I made a quick copy of your project http://jsfiddle.net/biznuge/fFu8G/8/

It seems like the issue could be related to either the trigger method or the cycle plugin. The trigger method may not perfectly replicate an actual click event, and there could be a conflict with the cycle plugin.

The version I created is far from flawless, but I didn't encounter the disappearing element issue in this iteration. However, I did notice some other unintended consequences. Interestingly, these issues seemed to disappear once I removed the "cycle" plugin. As I am unfamiliar with this plugin, I cannot provide more insight into what might be causing the conflict.

Best of luck resolving your problem!

Answer №3

The CSS class "block" includes a float: left property. Therefore, by eliminating the block on the left side, the adjacent block on the right will automatically move into its position (float there).

Answer №4

To organize the green boxes, place each one within its own div container of equal size and only move the individual box, not the entire container.

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