This post is about getting jQuery Unobtrusive Ajax helpers in ASP.NET Core. AjaxHelper Class represents support for rendering HTML in AJAX scenarios within a view. If you’re migrating your existing ASP.NET MVC project to ASP.NET Core MVC, but there is no tag helpers available out of the box as replacement. Instead ASP.NET Core team recommends data-* attributes. All the existing @Ajax.Form attributes are available as data-* attributes.

To use this first, you need to reference jquery and jquery.unobtrusive-ajax scripts, you can download and install it via bower. Here is the command to install the script libraries via bower - bower install Microsoft.jQuery.Unobtrusive.Ajax.

Once you install the script, you can reference it in _layout.cshtml file like this.

<script src="~/lib/Microsoft.jQuery.Unobtrusive.Ajax/jquery.unobtrusive-ajax.min.js"></script>

Here is the attributes which can be used to migrate @Ajax.Form helpers.

You can add these attributes with the Form element like this.

<form asp-controller="Home" asp-action="SaveForm" data-ajax="true" data-ajax-method="POST">
</form>

Here is the code, which will display a progress indicator while submitting the form, and once it is completed, success or failed, it will show alert message.

var results = $("#Results");
var onBegin = function(){
    results.html("<img src=\"/images/ajax-loader.gif\" alt=\"Loading\" />");
};

var onComplete = function(){
    results.html("");
};

var onSuccess = function(context){
    alert(context);
};

var onFailed = function(context){
    alert("Failed");
};

And here is the HTML form.

<form asp-controller="Home" asp-action="SaveForm"
    data-ajax-begin="onBegin" data-ajax-complete="onComplete"
    data-ajax-failure="onFailed" data-ajax-success="onSuccess"
    data-ajax="true" data-ajax-method="POST">
    <input type="submit" value="Save" class="btn btn-primary" />
    <div id="Results"></div>
</form>

Happy Programming :)