Richard Edwards Richard Edwards - 20 days ago 6
Ajax Question

Ajax.BeginForm OnBegin not firing (ASP.NET MVC5 application)

I've been trying to get a Javascript function to fire when my page's AJAX processing is triggered without success. Most of my time has been spent trying to get the OnBegin AjaxOption value working, but I have spent time with the global JQuery .ajaxSend handler as well (which I believe might not be compatible with ASP.NET MVC), both without success.

I've reduced my page to something pretty simple. My Index.cshtml for the project is:

@using SalePointWebItemInquiry.Controllers
@using System.Web.Mvc.Ajax

@{
ViewBag.Title = "Home Page";
}

@Scripts.Render("~/bundles/jquery", "~/bundles/jqueryval")

<script type="text/javascript">
function TestFunction() {
alert("Calling testfunction.");
}
</script>

@using (Ajax.BeginForm("PressButton",
"Home",
new AjaxOptions
{
OnBegin = "TestFunction"
}))
{
<div>
<input class="btn btn-default" type="submit" id="1" name="buttonType" value="Enter" />
</div>
}


The page that this renders is:

<!DOCTYPE html>
<html>

<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Home Page - My ASP.NET Application</title>
<link href="/Content/bootstrap.css" rel="stylesheet" />
<link href="/Content/site.css" rel="stylesheet" />
<script src="/Scripts/modernizr-2.6.2.js"></script>
</head>

<body>
<div class="container body-content bordered">
<script src="/Scripts/jquery-1.10.2.js"></script>
<script src="/Scripts/jquery.validate.js"></script>
<script src="/Scripts/jquery.validate.unobtrusive.js"></script>

<script type="text/javascript">
function TestFunction() {
alert("Calling testfunction.");
}
</script>

<form action="/Home/PressButton" data-ajax="true" data-ajax-begin="TestFunction" id="form0" method="post">
<div>
<input class="btn btn-default" type="submit" id="1" name="buttonType" value="Enter" />
</div>
</form>
<footer>
<div class="row">
<div class="col-md-5">
<p>&copy; 2015 - Application</p>
</div>
<div class="col-md-7 text-right">
Version: Put version here
</div>
</div>
</footer>
</div>

<script src="/Scripts/jquery-1.10.2.js"></script>

<script src="/Scripts/bootstrap.js"></script>
<script src="/Scripts/respond.js"></script>

<!-- Visual Studio Browser Link -->
<script type="application/json" id="__browserLink_initializationData">
{"appName":"Internet Explorer","requestId":"d2eef5342ac64f3db1545856102f4a6f"}
</script>
<script type="text/javascript" src="http://localhost:53954/45ae7332668647b5a3795d87cd6ba1a9/browserLink" async="async"></script>
<!-- End Browser Link -->

</body>

</html>


Does anyone have any thoughts on why the TestFunction() Javascript function isn't firing when I click the ENTER button?

Solution:
Thanks for the help :). I wasn't properly referencing jquery.unobtrusive-ajax.js. The direct solution to my problem was to use Nuget to retrieve a Javascript package that wasn't local using this command at Nuget console:
Install-Package Microsoft.jQuery.Unobtrusive.Ajax

Since I didn't have jquery.unobtrusive-ajax.js locally, all of my attempts to reference it locally failed. I may have tried a CDN reference once or twice, but that never worked out and I had a lot of theories as to the cause of the problem at the time.

I didn't even have to change the code. This code in BundleConfig.cs automatically included the file once I had retrieved it:

bundles.Add(new ScriptBundle("~/bundles/jqueryval").Include(
"~/Scripts/jquery.unobtrusive*",
"~/Scripts/jquery.validate*"));

Answer

You have duplicated

<script src="/Scripts/jquery-1.10.2.js"></script>

Remove the second one and then you also need to add jquery.unobtrusive-ajax.js in order for Ajax.BeginForm() to work (other wise you just making a normal submit - and therefore TestFunction() will never be called)

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