A "Validation.For" problem : The Official Microsoft ASP.NET Forums

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yukiyuqi

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A "Validation.For" problem

Jul 17, 2012 10:04 AM|LINK

Hey guys. I am learning the webmatrix and i create a edit form which is almost like the tutorial "movie list" one.

and now i am trying to validate the form input using the Validation.For function(check the input before submit the page.)

but i found out that my [validation.for] function only works after the first submittion. which means i have to submit once then the validation will work to check the empty field automaticlly without another submittion. but before the first submittion, it will not work. how did this happen? And also the check int function here didn't work but i don't know where was wrong.

here is my code, this is an edit page for a database list.

Thanks guys very much for your help!

@{ 
     Page.title="Edit Products";
    Layout = "~/layout.cshtml"; 
    
    Validation.RequireField("product", "You must enter a product name!"); 
    Validation.RequireField("price", "Price is required");
    Validation.Add("price", Validator.Integer("Price must be an integer")); 
 
 
    var product = ""; 
    var price = "";  
    var productId = ""; 
 
    if(!IsPost){ 
        
        if(!Request.QueryString["ID"].IsEmpty()){ 
            productId = Request.QueryString["ID"]; 
            var db = Database.Open("product"); 
            var dbCommand = "SELECT * FROM Productlist WHERE ID = @0"; 
            var row = db.QuerySingle(dbCommand, productId); 
            
            
            product = row.Product; 
            price = row.Price.ToString();
            
        } 
        else{ 
            Validation.AddFormError("No product was selected."); 
        } 
   }
   if(IsPost){ 
   
        if(Validation.IsValid())
        {
        product = Request.Form["product"]; 
        price = Request.Form["price"];  
        productId = Request.Form["id"]; 
 
        var db = Database.Open("product"); 
            var updateCommand = "UPDATE Productlist SET Product=@0, Price=@1 WHERE ID=@2"; 
            db.Execute(updateCommand, product, price, productId); 
            Response.Redirect("~/Page"); 
   }        }

}
 
<!DOCTYPE html> 
<html> 
  <head> 
   <meta charset="utf-8" /> 
   <title>Edit a Product</title> 
 
        <script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.6.2.js"> 
        </script> 
        <script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.8.1/jquery.validate.js"> 
        </script> 
        <script src="~/Scripts/jquery.validate.unobtrusive.js"> 
        </script>
 
  </head> 
</head> 
<body> 
  <h1>Edit a Product</h1> 
    @Html.ValidationSummary() 
 
   <form method="post" > 
    <fieldset> 
      <legend>Product Information</legend> 
 
      <div><label for="product">Edit Product Name:</label> 
         <input type="text" name="product" value="@product" @Validation.For("product") 
 /> @Html.ValidationMessage("product")
        </div>
 
      <div><p><label for="price">Edit Price:</label> 
         <input type="text" name="price" value="@price" @Validation.For("price")/></p> 
    @Html.ValidationMessage("price")
      </div>
        
         <input type="hidden" name="id" value="@productId" />

<p><input type="submit" name="buttonSubmit" value="Submit Changes" /></p> 
    </fieldset> 
  </form> 
 
    <a href="Page.cshtml">Main Page</a>
</body> 
</html>

Edited by yukiyuqi on Jul 17, 2012 10:17 AM

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Mikesdotnett...

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Re: A "Validation.For" problem

Jul 17, 2012 12:36 PM|LINK

The client-side Required validators fire when you attempt to submit the form. However, the data type checks do not work on the client. They only work on the server.

Regards, Mike
Beginning ASP.NET Web Pages with WebMatrix | My Site | Twitter

Marked as answer by Dino He - MSFT on Jul 24, 2012 04:06 AM

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Dino He - MS...

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Re: A "Validation.For" problem

Jul 19, 2012 04:56 AM|LINK

HI

You need Ajax.

For webmatrix you can use the jquery to implement.

WebMatrix, jQuery and Ajax: Together They Work like a Treat!

Please mark the replies as answers if they help or unmark if not.
If you have any feedback about my replies, please contact msdnmg@microsoft.com
Microsoft One Code Framework

Edited by Dino He - MSFT on Jul 19, 2012 05:20 AM
Edited by Dino He - MSFT on Jul 19, 2012 05:20 AM

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Mikesdotnett...

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Re: A "Validation.For" problem

Jul 19, 2012 05:00 AM|LINK

Dino He - MSFT
You need Ajax.

"Need" AJAX? How does that resolve yukiyuqi's question? The article you linked to doesn't even look at Web Pages 2 or validation.

Regards, Mike
Beginning ASP.NET Web Pages with WebMatrix | My Site | Twitter

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Dino He - MS...

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Re: A "Validation.For" problem

Jul 19, 2012 05:30 AM|LINK

Hi Mike

Thanks for warning me.

I will delete the answer.

Thanks.

Please mark the replies as answers if they help or unmark if not.
If you have any feedback about my replies, please contact msdnmg@microsoft.com
Microsoft One Code Framework

A "Validation.For" problem RSS

4 replies

yukiyuqi

A "Validation.For" problem

Mikesdotnett...

Re: A "Validation.For" problem

Dino He - MS...

Re: A "Validation.For" problem

WebMatrix, jQuery and Ajax: Together They Work like a Treat!

Mikesdotnett...

Re: A "Validation.For" problem

Dino He - MSFT

Dino He - MS...

Re: A "Validation.For" problem

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