The functionality of AutoPostBack results in the hidden div collapsing

After downloading the "Gentelella-Master Admin" template for my asp.net application, I encountered a problem with a dropdownlist that has autopostback enabled. When the dropdownlist is not active, the hidden div collapses in relation to the dropdownlist. Can you help me identify what may be wrong with my coding? Thank you in advance.

Note: The buy product panel remains visible when changing the dropdownlist "product," triggering an autopostback.

INDEX.ASPX STRUCTURE:


    <div class="col-md-12 col-sm-12 col-xs-12">
        <div class="x_panel">
            ...
            (Content of the x_panel)
            ...
        </div>
        
    </div>

    <div class="col-md-12 col-sm-12 col-xs-12">
        <div class="x_panel">
            ...
            (More content within the x_panel)
            ...
        </div>
        
    </div>

    <!-- end of Buy Product Panel-->
javascriptjqueryhtmlcssasp.net

Answer №1

After the postback, it is likely necessary to reset the visibility of the div.

        if (IsPostBack)
        {
            ScriptManager.RegisterStartupScript(Page, Page.GetType(), "showDiv", "document.getElementById('myDiv').style.display = 'block';", true);
        }

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