MVC :: 2 Validating Linq 2 SQL?
Jun 8, 2010
I'm following along with Nerddinner making a few changes, and can't figure out why my Create form is not validating. I'm using Linq to SQL and trying to use Modelbinding to map my form data automatically. Using the code below, I do not receive any validation errors on the page, but can't make it past my try{} block. When unhandled, the error I receive tells me I'm unable to insert a Null value for "basetype". This is correct based on Database constraints, but why am I receiving exceptions, and not the nice red error messages and validation?
Controller:
[Code]....
[Code]....
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Jul 19, 2010
i want to validate dropdownlist which is bound to objectdatasource. i am using following code but the listitem <asp:ListItem Value="-1">Select</asp:ListItem> doesnot appear. it shows only items that are stored in database. please help me how can i validate this dropdownlist.
<asp:DropDownList id="drpdwnFID" CausesValidation="true" runat="server" DataSourceID="objDtsrcForums" DataTextField="Title" DataValueField="ForumID" >
<asp:ListItem Value="-1">Select</asp:ListItem>
</asp:DropDownList>
<asp:RequiredFieldValidator ID="rqrValidDropDwn" InitialValue="-1" ErrorMessage="Select Forum" runat="server" ValidationGroup="submit" ControlToValidate="drpdwnFID" Display="None"></asp:RequiredFieldValidator>
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Apr 13, 2010
I'm using a DataGrid with edit functionalities in my project. It's handy, compared to having to edit its source data manually, but sadly, that means that I'll have to deal with validating user input a bit more.
And my problem is basically just that. When I set my DataGrid to EDIT mode, modify the values and then set it to UPDATE, what is the best way to check if a value that I've entered is, in fact, compatible with the corresponding column's data type?
i.e. (simple example)
// assuming
DataTable dt = new DataTable();
dt.Columns.Add("aa",typeof(System.Int32));
DataGrid dg = new DataGrid();
[Code]....
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Nov 2, 2010
I have a textbox that the user is suppose to enter a valid user name , the valid user names are stored in database. for example the valid user names might be U100, U101, U102 ,U103,U104,U105,U106,U107. so if the user types anything other than that he should get a error message and I dont want to implement a drop down list for that , how to do this in asp or should i explore javascript for this.
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Aug 27, 2010
validating the drop down list, that list contains 5 values if it is not selected then it should give errormessage
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Jan 18, 2010
I am using a MaskedEdit extender for a datetime entry. However, in case of invalid input of date and time, how am be able to validate it through the use of Ajax and validation will occur when the user clicks on the submit button.
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Sep 1, 2010
What's the best way to validate ICollection
ie. sample class:
[code]....
what's the best way to ensure that at least ONE BlogCategory is selected (if on the edit page BlogCategory is a list of checkboxes)
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Feb 8, 2011
I have two ddl'a which i insert into a database inform of a grid. Now i will like to make sure the two data i am inserting is not already on the databse and if it exist i want a message to show. I dont have anything right now. I just need ideas on how to go about it.
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Jan 13, 2011
I've got a View where I allow input, the fields are set as float in my SQL Server 2008 R2 database and I am using Entity Framwork 4. In the Entity Framework Model the field looks like this private Nullable<global::System.Double> _TestNumber;
And the View uses an EditorField to allow input like this:
<div class="editor-field">
@Html.EditorFor(model => model.TestNumber)
@Html.ValidationMessageFor(model => model.TestNumber)
</div>
I am however getting this error in the Validation Message: The value '13.51' is not valid for TestNumber. I've tried with a comma instead of period, same thing.
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Sep 14, 2010
I am following this tutorial : [URL]
I am where you "Create" an entry in the table, i have deleted the Id field, as Id is my primary key, and Is Identity = Yes, Identity Increment = 1, Identity Seed = 1.
When i hit the create button, the Id value is being validated, giving an invalid error. If i add the Id column back to the page, and fill in any number and click create, the entry is added to the database, with the Id value incremented (the typed in value does not matter). I believe this must have to do with the Movies.Designer.cs... but not sure how to fix it. Id should not be validated as it auto-incraments, but the model is looking for a Id value..
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Sep 23, 2010
I developed a screen in which there are fields like first name,username,password and email. I validated these fields using javascript and came to know that javascript is not that safe. So i decided to validate on server side also. My question is whether i can use asp controls like requiredfieldvalidator, regularexpression validator to validate the form or i have to validate through server side coding??
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Mar 28, 2011
When i use RequiredFieldValidator for Validation FCKEditor ,The first time that the form gonna submit, RequiredFieldValidator prompt (ErrorMessage) and indicate that FCKEditor is empty ,while it isn't .Again if you try to submit the form,It's OK and there is no problem .At this case user have to hit the submit button twice So i have to disable Client Side validation and validate form just in Server Side code which is not good.
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Dec 14, 2010
I use an asp Login control with WebControlCaptcha as shown in the above code. The problem is that the captcha control always returns false when UserValidated method is called. I tried to use captcha control on another webpage without the login control it works.
protected void Login1_Authenticate(object sender, AuthenticateEventArgs e)
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Oct 13, 2012
I want to prompt the user to enter up to four specific months as an input on my page. Should I use a textbox control and just apply validators to it? or a check list box? which would control what the user puts it and would make it easier to iterate through the selected items? The only concerns I have are the looks of the list box. Can I make it look and feel like a drop down box? Also, how do I limit the selection to 4? If I use a text box, how do I validate that "up to" 4 items are entered let's say separated by a comma?
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Nov 30, 2010
I have been thinking what is the right way to validate the data I am sending to a web method from jQuery ajax call. I have formerly used updatepanels to do my ajax, but am trying to shift to jQuery now and validation seems to get more complicated.
So obviously there are both client- and server-side validation options. At first I tried implementing jQuery validation plugin and got it working. But surely client-side validation is not good enough alone. Then I considered implementing regular asp.net validation to validate on the server. But what if a user tampers the input parameters after the validation happened. He could break the execution of the script in Firebug and change the input to whatever he wanted. So how can I either prevent that or implement validation in the web method?Here is my ajax call which sends a message to the server. [Code]....
You see I am sending three parameters (id of the person who this message is ment for, message type and message text). Even if I implement asp.net validation against input controls, a user might change those input values in Firebug, right? So I need to validate the input again in the web method? Or what would be the best way from the beginning?
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Sep 21, 2010
Before committing the record from the postback of the Create or Edit method in my controller, I validate the values in the form against some business rules in the GetRuleViloations() of this domain object. The following rule example is written in two ways. The 1st one validates against the numeric values in form, the 2nd one validates using the associated object (lookup table in database) description via the foreign key. I would like to use the 2nd method, but during the Create postback the associated object is always null.
[Code]....
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Dec 17, 2010
I have created a gridview with dropdownlist in asp.net(c#).i want to validate dropdownlist using jvascript.if i dont select anything from dropdownlist that time script shud display a message.i don know how to get the name or id of that dropdownlist
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Sep 7, 2010
I can't seem to get any sort of validator to fire when validating my DropDownList. I just want to make sure that it isn't left at "--Select--" when the user presses the Add button on the page. I've tried a range validator and required field validator and neither seem to fire at all. My DropDownList contains ID which is an int that is hidden and Name which is a string that is displayed. The ID is -1 for "--Select--". I use these all the time and can't understand why the page in this new solution is any different from other solutions I have done in the past. What have I missed?
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Sep 17, 2010
I am using javascript for customValidator to validate textboxes in ASP.Net. The code works perfectly when I am using a normal page, but as soon as I put that inside a MasterPage, the code doesn't work. Below is the code for my aspx page. If I put this code inside a MasterPage it doesn't work.
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<script type="text/javascript">
function validateOrFields(source, args){
var sUser = document.getElementById('TextBox1');
if (sUser.value == "")
{
args.IsValid = false;
}
else
{
args.IsValid = true;
}
return;
}
<div>
<asp:TextBox ID="TextBox1"
runat="server"></asp:TextBox>
<asp:CustomValidator ID="FieldValidator"
runat="server"
Text="Enter either a user name"
ClientValidationFunction="validateOrFields" onservervalidate="FieldValidator_ServerValidate"/>
<asp:Button ID="Button1" runat="server" Text="Button" />
</div>
</form>
</body>
</html>
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Jan 19, 2011
I'm using asp.net validation controls which work fine. I've since introduced an HTML checkbox which should be ticked before the form can be submitted. My function for this reads as follows:
function terms(form) {
var terms = document.getElementById("chkTerms").checked;
var errorsArray = new Array();
if (terms == false) {
//alert("Terms not checked (works)");
errorsArray.push("You must agree to the terms and conditions.");
if (errorsArray.length) {
document.getElementById("termsOutput").innerHTML = errorsArray.join("
") + "<br />";
return false;
}
}
else {
document.getElementById("termsOutput").innerHTML = "";
}}
It is called as follows:
<asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClientClick="return terms(form)" />
The problem I have is seems I can either use the asp.net validation OR the custom checkbox validation I wrote. After the form posts however, the asp.net validation fires!
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Sep 4, 2010
I am trying to incorporate facebook login in my ASP.NET web app and came across the following article which has a code sample for the same.
[URL]
The following is from the article.
Next, and most importantly, the class validates the cookie. This validation uses MD5 hashing to compare the contents of key appended to the app secret to the signature that comes in with the cookie. If these values match we know the key is valid.we know the key is valid.
Why is Md5 hashing being used for that? Why not SHA or some other algo?
What happens if I don't validate the cookie? Can invalid cookies be sent to the server?
In the article, he throws a new security exception if cookie is invalid? What should the user do in such a case?
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May 18, 2010
I need to validate a coming request where form is being submitted from the another domain to my website,
Like
[URL]
Remote site:
[URL]
Now this submit.aspx form get submitted to my website,
how to validate on [URL] that request is coming from [URL] only.
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Jan 19, 2010
I am wanting to have a numbers/currency only textbox control. So basically it should accept this kind of input
$123
523,100
$12.50
85.59
and convert this to
123
523100
12.50
85.59
and should not accept this input
F12
309$2342
,102
I have looked at validator controls but I would like to this conversion/checking completely from the client side. What would be the best way of doing this? I also would like a clientside error(message box or something) popped up if they try to enter invalid data and prevent them from leaving the bad data in the textbox. and then when they get out of focus of the textbox it automatically converts the data into a flat number from the client side.
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Mar 2, 2010
I have 2 text boxes one for first name and one for last name. If the user enters a first name then the last name cannot be empty. Is there a validation control i can use and how can i display the message in the validation summary.
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Jan 26, 2010
We are developing an Intranet application that looks up some data for a user through hooks into Active Directory. However, our Network guys don't always enter in a users email address when creating a new user. Therefore, our user database is missing the email address for over half of our users. We have over 10,000 users, therefore asking them to enter 5000+ email addresses into each missing email address field in Active Directory isn't an option. I already know how to validate that an email address is correctly formatted using Regex. What I need is a way to lookup the email address entered in the email address textbox and see if it exists on Outlook/Exchange (or looking up the email address using the First Name/LastName would work). If it does exist then the address is valid, if it is invalid then the user typed in the wrong address. I've tried to do something with CDO, but have had no luck. We use Outlook 2003 and ASP.NET 2.0.
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