how to use jquery with razor syntax in asp.net mvc 5?

Question

I need to use jQuery to add some elements dynamically. So I looked up in the internet and I found this. It is nice and working when there is plain html elements inside single quotes. I need to use razor syntax with jQuery.

I understand that jQuery is user side and razor is server side. They cannot be combined together. I am asking here because I need to know how do i achieve this.

My not working jQuery is as follows:

<script type="text/javascript">  
    $(document).ready(function () {  
        $(document).on("click", ".btnPlus", function () { 
        var html = '<div class="form-group">'+
                '@Html.LabelFor(model => model.transaction_item, "transaction_item", htmlAttributes: new { @class = "control-label col-md-2" })'+ 

                '<div class="col-md-4">'+
                    '@Html.DropDownList("transaction_item", null, htmlAttributes: new { @class = "form-control" })'+
                    '@Html.ValidationMessageFor(model => model.transaction_item, "", new { @class = "text-danger" })'+
                '</div>'+

                '<div class="col-md-6"><input type="button" class="BtnPlus" value="+" /></div>'+

            '</div>'
        $("#trItem").append($(html))
    };
});

My aim is similar to the tutorial - to add elements dynamically. Here I am adding a label and dropdown on the click of button. How do I achieve this?

Answer 1

You cannot add Razor elements using JQuery because, as you have stated, JQuery is a client side library and ASP.NET using Razor syntax is a server side scripting language.

If you want to add elements created using Razor syntax then add a hidden element to the page and use JQuery to add a clone of it to the DOM.

Something like this should give you an idea of what I mean:

@Html.DropDownList("transaction_item", null, htmlAttributes: new { @class = "form-control", @id = 'template-ddl' })

$("#trItem").append($('#template-ddl').clone());

Answer 2

You can create a partial page _MyPartial.cshtml in your Views Shared folder.

Then in your view reference add the reference to your scripts section

@section Scripts {
    @Html.Partial("~/Views/Shared/_MyPartial.cshtml",Model);
}

Partial page: _MyPartial.cshtml

@model MyViewModel

<script type="text/javascript">  
$(document).ready(function () {  
    $(document).on("click", ".btnPlus", function () { 
    var html = '<div class="form-group">'+
            '@(Html.LabelFor(model => model.transaction_item, "transaction_item", htmlAttributes: new { @class = "control-label col-md-2" }))'+ 

            '<div class="col-md-4">'+
                '@(Html.DropDownList("transaction_item", null, htmlAttributes: new { @class = "form-control" }))'+
                '@(Html.ValidationMessageFor(model => model.transaction_item, "", new { @class = "text-danger" }))'+
            '</div>'+

            '<div class="col-md-6"><input type="button" class="BtnPlus" value="+" /></div>'+

        '</div>'
    $("#trItem").append($(html))
};
</script>