How can get value of an item based on ID in cshtml? - html

Question

Let says I have a select tag with a specific id and multiples option. Then below, I want to display partial view base on the selected . I think of using something as if else statement but I don't know how to gain the value of that select with c#.
My thought about this is like this
<select id="selectItem">
<option value="A">A</option>
<option value="B">A</option>
<option value="C">A</option>
</select>
#if ('selectItem' == "A"){
<partial name="..."/>
}

Answer 1

you can do it with js,here is a demo:
Controller(Test):
public IActionResult Index()
{
return View();
}
public IActionResult Partial()
{
return PartialView("Partial1");
}
Partial1:
<h1>Partial1</h1>
Index.cshtml:
<select id="selectItem">
<option value="A">A</option>
<option value="B">B</option>
<option value="C">C</option>
</select>
<div id="PartialContent"></div>
js:
<script>
$(function () {
getPartial();
});
$("#selectItem").change(function () {
getPartial();
});
function getPartial() {
if ($("#selectItem").val() == "C") {
$.ajax({
type: 'GET',
url: "/Test/Partial",
dataType: 'html', //dataType - html
success: function (result) {
//Create a Div around the Partial View and fill the result
$('#PartialContent').html(result);
}
});
}else {
$('#PartialContent').html("");
}
}
</script>
result: