Deviations in Scriptaculous Callbacks during Movement Effects

I am looking to create a dynamic menu item that moves out 5px on mouseover and returns to its original position using Scriptaculous. I have implemented the afterFinish callback to ensure that the bump-out effect is completed before the item moves back in.

However, I am facing an issue where the item does not return to its original position if the mouseover and mouseout actions are done quickly multiple times. The more I repeat this action, the further off the item gets from its original position. I believed that the afterFinish callback should prevent this behavior. It seems to work fine with the Morph effect but not with other Scriptaculous effects as mentioned in the following link:

Javascript - Scriptaculous - Effect Callback function

I have tried implementing effects queues to solve the issue, but the result remains the same. I have spent hours searching various forums for solutions with no luck.

Below is an example of the Morph effect that works correctly:

<SCRIPT>
function morphMe(obj) {
  new Effect.Morph($(obj), {
  style: {
  height: '200px',
  width: '200px'},
  afterFinish: function(){ new Effect.Morph($(obj), {
    style: {
    height: '20px',
    width: '200px'}}); 
    }
  })
}
</SCRIPT>
<div id="bumptest" class="leftnav" style="position: absolute; left: 100px; width: 200px; border: 1px solid green" onmouseover="morphme(this);">Morph Me</div>

Here is an example of the Move effect that does not behave as expected when there are quick mouseover-and-outs. I am considering using setTimeout, but I am unsure why it would be necessary.

<SCRIPT>
function OnFinish(obj){
 new Effect.Move(obj.element.id, {x: -5, y: 0, duration: .4});
}

function bumpOut(myObject){
 new Effect.Move(myObject, 
  { x: 5,
    y: 0,
    duration: 0.4,
    afterFinish: OnFinish,
  });
}
</SCRIPT>
<div id="bumptest" class="leftnav" style="position: absolute; left: 100px; width: 200px; border: 1px solid green" onmouseover="bumpOut(this);">Bump me right and then back</div>

Any assistance, whether through modifying setTimeout or directing me to a reliable script that accomplishes this goal, would be greatly appreciated.

Thank you,

motorhobo

Answer №1

To resolve this issue, it is important to consider parallel processing: the problem arises when multiple effects are running simultaneously. This is primarily due to how scriptacoulous handles effects by calculating the target position at the time of effect creation.

Here's an example scenario that overlooks the afterFinish function:

  • 0.0s: 1st new Effect: "Starting at current position (100|10), I need to move 6px right, resulting in a target position of (106|10) within 0.4 seconds."
  • 0.2s: 2nd new Effect: "Currently at (103|10), moving 6px right leads to target position of (109|10)." <- Error, there's an offset!
  • 0.2 - 0.4s: Both effects will adjust the left value (potentially causing flickering).
  • 0.4 - 0.6s: Only the second effect remains, transitioning from (106|10) to (109|10).
  • 0.6s: Resulting position is (109|10).

(Similar issues apply to other effects like highlight(): Multiple simultaneous highlights may not revert background color correctly. Also seen in: Scale, BlindDown/Up, and others.)

The solution lies in providing absolute values for each call:

$(this).morph({left:106px}); // etc.

Queues also play a role in resolving this issue. Upon calling bumpOut, ensure that any OnFinish-Effect is terminated to prevent box position flickering. Additional checks may be required to guarantee:

  • Only one bump-effect executes on the box at a time
  • The correct effect takes precedence ("recent activity overrules older ones" or "an ongoing animation must complete first.").

Another challenge is that mouseover triggers even with child elements of bumptest (even a <b>!), more frequently than expected. For specific events when entering/leaving bumptest, utilize mouseenter / mouseleave instead.

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