I have a form, I want to check the username is availability. I that I have html textbox, in Onclcik I'm calling java script function. The script has to call the Action methods in controller. Based upon the username availability it has to return either 1 or 0. I have tried Json. But its is showing "Microsoft JScript runtime error: '$' is undefined". Can anyone help me in this.
2 Answers
If you get that message it means you're trying to use jQuery but you haven't included the library. You can use Google's CDN. I guess you've used Ajax to call. Something like this:
$.ajax({
type: 'POST',
url: '<%=Url.Action("Your Action", "Your Controller")%>',
data: { userName: $('#UserName').val(), password: $('#Password').val() },
dataType: 'json',
complete: function(XMLHttpRequest, textStatus) {
// User your JSON response.
}
});
If you're using a POST you have to decorate your action with the attribute [HttpPost]
and remember to specify JsonRequestBehavior.DenyGet when you return your JSON object:
[HttpPost]
public JsonResult CheckUserName(string userName, string password)
{
// notification: your object
return (Json(notification, JsonRequestBehavior.DenyGet));
}
Comments
If you are using Jquery (the $ sign), then that means that you need a script reference to jquery implementation before your javascript code that calls JSON.
script type="text/javascript" src="jquery.js"></script>
Where jquery.js is the latest version of the jquery javascript file
2 Comments
S.Siva
So can u tell me which script I need to reference. In MVC project I have nearly 6 jquery scripts
TBohnen.jnr
Cool, thanks man, just for that, I'll vote you up too given that you've made more effort :-)
titleof the document<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js></script>"