Show or Hide History in MVC - asp.net-mvc

Question

I am working on a registration form. I want to show and hide my users past registrations using a button.The button should only show or hide registrations that are gone not the upcoming ones This is what I have so far. Pleasssseeee Help.
<div class="Table01">
<button id="older">Show Registration History</button>
#foreach (var sm in Model)
{
var tmp = #sm.SeminarNm.Replace("&", "and");
<div class="col-xs-12 col-sm-12 col-md-12 col-lg-12 well table-item" align="left" data-toggle="tooltip" data-eventtype="#tmp" data-placement="top" title="#tmp">
<span class="sortName mid-weight"> #sm.SeminarNm</span>
<span class="sortDate alert-info">(ON #string.Format("{0:yyyy-MM-dd}", #sm.SessionStartDT) IN #sm.SessionCityNm)</span>
<div class="row " style="margin-top:10px">
#if (#sm.IsEditable == "Y")
{
using (Html.BeginForm("EditRegister", "App", FormMethod.Post, new { onclick = "showPageLoadingSpinner()" }))
{ #Html.AntiForgeryToken()
<div class="col-xs-12 col-md-6 col-lg-6">
<input class="btn btn-success " name="submitButton" type="submit" value="Edit" />
<input type="hidden" value="#sm.RegistrantSeq" name="hiddenseq" />
<input type="hidden" value="0" name="cntView" />
<input type="hidden" value="EditRegister" name="cntStage" />
</div>
}
}
#using (Html.BeginForm("ViewRegister", "App", FormMethod.Post))
{ #Html.AntiForgeryToken()
<div class="col-xs-12 col-md-6 col-lg-6 col">
<input class="btn btn-info" name="submitButton" type="submit" value="View" />
<input type="hidden" value="#sm.RegistrantSeq" name="hiddenseq" />
<input type="hidden" value="ViewRegister" name="cntStage" />
</div>
}
//
</div>
}
</div>
</div>
#section Scripts {
#Scripts.Render("~/bundles/jqueryval")
}
<script>
var $btns = $('.btn').click(function () {
if (this.id == 'older') {
$('#child > div').toggle(450);
}
$btns.removeClass('active');
$(this).addClass('active');
})
</script>
My Program Pic
I dont know if I need some sorting javascript function to display only those sessions that are in the past. Nothing seems to be working.

Answer 1

Assuming old registrations are any item with SessionStartDT value earlier than current date, you can set an html data attribute on each item's container div indicating whether it is an old item or new item and when user clicks the hide/show button, toggle the visibility of these items.
#foreach (var sm in Model)
{
<div data-old="#(p.SessionStartDT.Date < DateTime.Today.Date)">
<!-- your existing code for rendering each item goes here -->
</div>
}
And in the javascript part, when the button is clicked, make select the elements who's data-old attribute value is True (which we set via our C# expression which results in a boolean value) and toggle the visibility.
$(document).ready(function() {
$("#older").click(function(e) {
e.preventDefault();
$("[data-old='True']").toggle();
});
});