Web Forms :: How To Use Server Side Validation To Ensure Image Field Is Not Null
Aug 20, 2010
I'm having trouble accomplishing the above. Below is all the mark up and code. I'm not getting error messages, but the validate image function is not working (fileupload portion is working ok).
In my attempt below---not sure if it's the simplest or best validation approach anyway---the "UserId" parameter appears during rendering to be empty---but in most methods I have it successfully containing or referring to the logged-in user's identification.
Following is the control that refers to the image field (page = advertisement.aspx):
<asp:Image ID="Image" runat="server" ImageUrl ='<%#Eval("UserId","Image.aspx?UserId={0}") %>'
Following is the successful code behind for the page image.aspx referred to above (page = image.aspx.vb):
[code]....
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Feb 18, 2011
I am calling a Java-script function, in that i am passing the value of hidden field, that hidden field i want to use at server-side, but the value of hidden field is null.
Client Side function
function getDetails()
{
document.forms[0].HdnNode.value=tree_selected_id; //HTML Hidden Field.
str="Cmp_12";
str_array=str.split("_");
var str_array1=str_array[0];
var str_array2=str_array[1];
document.getElementById("<%=HiddenNodeId.ClientId %>").value=str_array1;
document.getElementById("<%=HiddenTreeId.ClientId %>").value=str_array2;
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Server Side Function
Public Sub InsertNodes(ByVal NodeId As String)
Dim objErrorObj As New ErrorObj
Dim ParentID As String
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NodeId = HiddenNodeId.Value
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Sep 6, 2010
want to know that can we validate a control which is out side a form element in asp.net(server side validation)and outside a form element in html(client side validation) let's take a closer look
<html>
<body>
<input type="text" name="first name"/>
</body>
</html>
can we apply clien side validation on above text box by java script ?in asp.net
<form runat="server">
</form>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
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Mar 1, 2011
I'm interested in identifying a means to verify the server-side validation is performing as expected, but need to bypass the client-side validation being done using ASP.NET validation controls. To test this, I've tried using the form Poster add-on to Firefox that allowed me to get/modify the page contents and post it, but the .NET framework interpreted the submission as harmful and threw an application error ("A potentially dangerous Request.Form value was detected from the client").I've created a WinForm that includes a WebBrowser control and I'm able to manipulate the contents of the web page and invoke the button click, but am interested in seeing how to allow a postback with invalid input values. I don't want to assume the server-side validation works (even though I do check if Page.IsValid on the server on postback).This submits the web form in the WebBrowseer control and the expected client-side validation fires:
extendedWebBrowser1.Document.GetElementById(formButtonName).InvokeMember("click");
This is how I've manipulated some of the page contents (this just prevents submission):
mshtml.IHTMLDocument2 doc = extendedWebBrowser1.Document.DomDocument as mshtml.IHTMLDocument2;
string html = doc.body.innerHTML;
html.Replace("Page_ValidationActive = false", "Page_ValidationActive = true");
doc.body.innerHTML = html.ToString();
extendedWebBrowser1.Document.GetElementById(formButtonName).InvokeMember("click");
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Jun 15, 2010
I have studied Phil Haack's post [URL]about custom validation, however, I can not get this to work for my case. I need something like the "PropertiesMustMatch" validator in a default MVC2 project generated by Visual Studio.
None of my custom javascript gets called. I am registering the custom adapter in Application_Start using DataAnnotationsModelValidatorProvider.RegisterAdapter(....). In the DataAnnotationsModelValidator derived class, GetClientValidationRuls is never even called.
What is going on here? Maybe this type of validation where your validation attribute has to be applied to a class, not a propety, does not yet work with the RTM release of Visual Studio 2010.
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Nov 6, 2010
i am using the following in a stored procedure.
[code]....
[Code]....Handling NULL...Field not updating when NULL?
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Aug 12, 2010
I'm using an entity model with metadata annotations. My controller method looks like this...
if (!ModelState.IsValid)
{
return View(model);
}
else
{
UpdateModel(model);
repo.Save();
return RedirectToAction("Index");
}
If I enable client side validation in the view I'll get the error per the Attributes from the metadata class. If I take clientside validation out, error gets thrown from saving to the DB rather than return the view with an Error Summary.
This is the top portion of my view....
<% using (Html.BeginForm())
{%>
<%: Html.ValidationSummary(true) %>
I've tried running without debugging (ctrl + f5) in debug and release mode as well as setting breakpoints and Debugging (f5) but it just seems weird to get Client side validation without server side validation. What am I missing here?
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Feb 23, 2010
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Mar 28, 2011
Actually i have a table with 7 columns
1) Title varchar(100)
2)Description varchar(300)
3)ProfilePicture varbinary(max)
4) Image1 varbinary (max)
5)Image2 varbinary(max)
6)Image3 varbinary(max)
7)Image4 varbinary(max)
Image1,2,3,4 are not a mandatory fields so, when i inserted, i check it if it is not there then i insert null value, Now problem is when i retrive them if there is a row contain image1,2 are image content and 3,4 are null values dataset also filling as it is in database but when i checking like
[code]....
it shows error like
Unable to cast object of type 'System.DBNull' to type 'System.Byte[]'.
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Feb 6, 2010
Is there a validation expression or any other way to check a birthdate entered to ensure the date entered makes the person "at least xx years of age" as of the current date? We have a registration form that asks the birthdate and we need to have a date validation that 'error messages' the user if they are under the minimum age.
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Nov 9, 2010
if I have done the Validation in .aspx file for Server Side control as
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</asp:RegularExpressionValidator>
should I have to do Server Side code validation in .aspx.cs file also using classes such as RegexStringValidator. Is it not enough to do validation using the above code. Will it work for Server Side also.
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Nov 29, 2012
I am developing an application in which i have to store image in database SQL server2008. I want to use upload file control and only want to upload .jpg and JPEG file and view this image in image control . And when i want to update this record i can update that image too..
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Aug 14, 2013
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Aug 7, 2010
[Code]....
Public Sub CustomValidator1_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs) Handles CustomValidator1.ServerValidate
' Get file name
Dim uploadAvatar As FileUpload = DirectCast(AdvertisementForm.FindControl("uploadAvatar"), FileUpload)
Dim UploadFileName As String = uploadAvatar.PostedFile.FileName
If UploadFileName = "" Then
' There is no file selected
args.IsValid = False
Else
Dim Extension As String = UploadFileName.Substring(UploadFileName.LastIndexOf(".") + 1).ToLower()
If Extension = "xls" Or Extension = "xml" Then
args.IsValid = True ' Valid file type
Else
args.IsValid = False ' Not valid file type
End If
End If
End Sub
<table>
<div>
<td><asp:FileUpload ID="uploadAvatar" runat="server" /></td>
<td><asp:LinkButton ID="BtnUpdate" runat="server" CausesValidation="True"
CommandName="Update" Text="Update" CssClass="updatebutton" OnClientClick="ValidateFileUpload();" /></td>
<asp:CustomValidator ID="CustomValidator1" runat="server"
ClientValidationFunction="ValidateFileUpload"
ErrorMessage="Please select valid .jpg or .bmp file" ></asp:CustomValidator>
<td><asp:LinkButton ID="LinkButton2" runat="server"
CausesValidation="False" CommandName="Cancel" Text="Cancel" CssClass="cancelbutton" /></td>
</tr>
</div>
</table>
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Oct 12, 2010
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Feb 10, 2010
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Feb 4, 2011
I have an asp.net application with basic CRUD functionality. On a page where i am capturing customer details i have several asp.net validators to required fields. I have attached a JS confirm box on the asp.net save button for the form. The trouble is that when the user leaves required fields unfilled and clicks the save button, the JS confirm box comes up, when the ok button is clicked, the save method is called successfully and only after this happened do the asp.net validators fire and display that required information has been left out.
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Feb 23, 2011
I have a text box in which I want only digits (either decimal or whole numbers). I have applied Required Field Validator and Regular Expression Validator on it.I have an Image Button, by clicking on which, I want this validation to be performed. But when I build the code, and clicks on Image Button, these validators do not work and I am redirected to the server side method of Image Button and after completing the execution of server side method, control comes to these validators and client side validation executes.I am fed up by finding solutions on Google and unable to find any solution.Please tell me of anyone of you know the solution that why server side code is running first and client side validation is executing after server side code execution.
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May 7, 2015
In my web page I have a Checkbox (datatype = tinyint/boolean) and 2 Required field validator (whose visibility is false). I want that when I check(tick) the checkbox, then required field validator visible = true, else not.For this I tried this code on Page_Load as well as on save button click, but it is not working:
protected void Page_Load(object sender, EventArgs e) {
if (ChkComplexPass.Checked) {
Regex4.Visible = true;
Regex.Visible = true;
[Code] .....
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Mar 5, 2010
I have a page with a table and two button with the names (Submit and Add Rows) When I click on Add Row a new row will be added to a page(This is achieved using javascript), when I click on submit button I will be doing server side validation. If I found any error the error will be displayed on the page. During this process the controls which were added by me were loosing its state. As a result I need to add the rows once again and need to fill the data and click on submit button. Can any one let me know how to avoid this and see that the controls donot loose their states. So that there is no need for me to create rows once again if any validation fails on the server side.
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Jan 10, 2010
i am following validation code from this link..http://www.dotnetcurry.com/ShowArticle.aspx?ID=413&AspxAutoDetectCookieSupport=1so added dll's Microsoft.Web.Mvc.DataAnnotations, System.ComponentModel.DataAnnotations( i removed this dll and added again). now iam getting this error when iam click on login button.Server Error in '/' Application.Method not found: 'System.Collections.Generic.IDictionary`2<System.String,System.Web.Mvc.ValueProviderResult> System.Web.Mvc.ModelBindingContext.get_ValueProvider()'.
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Sep 6, 2010
i want to know that if apply server side validation on text box then when validation event fire (i means in wich state of page cycle this validation has been done in server side)
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Jan 26, 2010
I want to integrate paypal inside my shopping cart. For that it requires a html form to be embeded inside .aspx page with the action to paypal and method is post. Inside that form there are some hidden input filed. I want to assign one of those hidden field's value from server side code so i need to access that filed from server side. But how? Here is my form:
<form action="[URL] method="post" id="PaypalForm">
<input type="hidden" name="cmd" value="_cart"/>
<input type="hidden" name="upload" value="1"/>
<input type="hidden" name="business" value="[URL]
<input type="hidden" name="item_name_1" value="Item Name 1" />
<input type="hidden" name="amount_1"/>
<input type="submit" value="PayPal" />
</form>
I want to access amount_1 filed.
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Apr 1, 2011
I have a DetailsView on the page and I have made one of the fields a TemplateField. In the EditItemTemplate and InsertItemTemplate I have a DropdownList that is databound to a table in my Sql Server database. I wanted to add an initial value to the DropdownList
namely "- select -" .
I set the AppendDataBoundItems property to true and added the initial value as a ListItem.Markup of the DropdownList
<asp:DropDownList ID="DropDownList_HP" runat="server"
AppendDataBoundItems="True" DataSourceID="SqlDataSource_HP" [code]...
This works fine for new input. The problem is however that the database already has records that were entered through a Windows Application and many of these records has a null value in this field and exceptions are thrown when I tried to open these records
and the system tried to set the SelectedValue of the DropdownList.After some more searching I found this help
http://msdn.microsoft.com/en-us/library/ms366709.aspx
So I changed the ListItem in the DropDownList markup to the following:
<asp:DropDownList ID="DropDownList_RefHospDV4" runat="server"
AppendDataBoundItems="True" DataSourceID="SqlDataSource_RefHosp" [code]...
This now solved the problem of opening a record where the value is null in the database, BUT now the RequiredFieldValidator is not validating anymore to make sure that a databound item is selected for this field and not the initial value "- select -". So basically now it is not checking anymore to see if valid input has been entered for the DropDownList and it accepts "- select -" thus it acts as if the field is not a required field anymore.
In short what is required is that I want to make sure that the user enters a valid selection in the DropDownList, but it must also cater for old records that do not have this field entered yet so that those old records can be opened in the DetailsView .Opening Old records (with null in that field):When these old records are opened in the DetailsView the DropDownlist should show "- select -" when the value in the database is null.
Saving records (old or new records):When saving the record in Insert mode or Update mode the RequiredFieldValidator should show that a valid input is not selected if the DropDownList is still on "- select -".
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Dec 24, 2010
I put back ground image for a table and it is repeating.
How can i set no repeat
My code:
HtmlTable htmlTable = FindControl("TableTemplates") as HtmlTable;
sshtmlTable.Style.Add(HtmlTextWriterStyle.BackgroundImage, Backurl);
This is my table
<table align="left" width="396" border="0" cellpadding="0" cellspacing="0"
style="border: solid 1px #000000;" id="TableTemplates" runat="server">
<tr id="rowHeader" runat="server" height="100">
[Code]....
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