The issue with Ajax.BeginForm OnSuccess is that it prevents the CSS transition from functioning properly

Apologies if the title is unclear.

In my design, I aim to implement a transition effect when the left or right buttons are clicked. However, the transition does not function as expected because the OnSuccess callback seems to occur before the page is rendered. Therefore, the transition effect is not visible. I have been unable to find a solution to this issue.

<script>
    function show() {
        document.getElementsByClassName("comment-item-panel")[0].style.right = 0;
    }
</script>

@using (Ajax.BeginForm("Comments", null, 
    new AjaxOptions() { UpdateTargetId = "comm", OnSuccess = "show()" },
    new { @class = "comments" }))
{
    <button type="submit" name="page" class="vertical-button vertical-button-right" value=@(Model.PagingInfo.CurrentPage+1)>&lsaquo;</button>

    <div class="comment-item-panel">
        @foreach (var comment in Model.Comments)
        {
            <div class="comment-item">
                <h5>@comment.Commentator.UserName</h5>
                <p>@comment.Text</p>
            </div>
        }
    </div>

    <button type="submit" name="page" class="vertical-button vertical-button-left" value=@(Model.PagingInfo.CurrentPage-1)>&rsaquo;</button>
}


.comment-item-panel {
    right: 999em;
    transition: right 1s;
}

Answer №1

When using Ajax.BeginForm, the CSS transition may not work as expected. Here is a helpful solution:

Click here for more information

Answer №2

Here is an alternative method that might assist you in your task.

If you call show() before the content is rendered, you can monitor the dom-manipulation process.

Something like this:

function show() {
   // Monitor dom manipulation and trigger action when items are added.
    $("form").one("DOMSubtreeModified", function() {
        alert("tree changed");
        document.getElementsByClassName("comment-item-panel")[0].style.right = 0;
    });

}

The following snippet demonstrates how to monitor dom-manipulation:

// Event handler only triggered once, as it's rebound after each post.
$("#comments").one("DOMSubtreeModified", function() {
    alert("tree changed");
});

$('button').click(function(){
 $("#comments").append('<p>new element added!</p>');
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="comments">
  
</div>
<button>Add Element</button>

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