I am trying to validate a textbox in C# to see if it is null before submitting but it still allows me to submit and does not give the warning message. here is my code
[Code]....
Im dynamically creating several dropdowns onclick of a button... but the dropdown returns null when im trying to get the values on submitting the form... i read tat during postback all dynamically created controls will be lost... s there a way to register the controls... i want to access the item selected in the dropdown .... expecting a positive reply...
View 1 RepliesI'm experimenting with validating forms in the asp.net MVC framework. I'm focusing on server side validation for the time being. I've come across an error that I'm not sure how to rectify. System.NullReferenceException: Object reference not set to an instance of an object. The code that throws the error is:
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Create([Bind(Exclude="ID")] MembersCreate mc )
{
mc.Modules = ModuleListDataContext.GetModuleList();
ViewData.Model = mc;
//Validation using ModelState
//
//
//line below errors when form field is empty
//
if ((string)mc.Member.Username.Trim() == "")
ModelState.AddModelError("Member.Username", "Username is required.");
if (!ModelState.IsValid)
return View();
try
{
// TODO: Add insert logic here
return RedirectToAction("Index","Home");
}
catch
{
return View();
}
}
When I put spaces in the field it performs exactly as i want, but if I leave the field blank and press submit I get the error. What's the best way to avoid this error and still validate blank form fields?
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.
View 5 RepliesI have created the user control and it has got one table with few rows in it. One row has got a text box with custom validaor and other row will have check boxes dynamically added through server side.
On the main page, i am loading that user control about 10-15 times depending upon the values from the database.
Is there any way of setting the properties of user control validator on the main page? Text box will only be validated if any check box is checked in the user control.
I am also not able to find the usercontrols through the main page.
We have a site were trusted users can add some Javascript tracking code into a text box for submitting, so naturally we have turned off Validation by adding the ValidateRequest="false" into the Page Directive.
However it we seem to be getting the error again all of a sudden : A potentially dangerous Request.Form value was detected from the client , Now we cant add ValidateRequest="false" into the Config or the Master page this page inherits from. So how do I allow Javascript to be posted, what is overridding the ValidateRequest?
We are using .Net 3.5
I have the following piece of code which I was hoping would result in an error message being displayed if an incorrect date format was input rather than an website error page saying "The string was not recognized as a valid DateTime."
<asp:TemplateField HeaderText="DateCompleted" SortExpression="DateCompleted"> <EditItemTemplate> <asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("DateCompleted") %>'> </asp:TextBox> <asp:CompareValidator ID="CompareValidator" ValidationGroup="GridView1" ControlToValidate="TextBox2" errormessage="Invalid Date" Display="Dynamic" Operator="DataTypeCheck" Type="Date" runat="Server" /> </EditItemTemplate> <ItemTemplate> <asp:Label ID="Label2" runat="server" Text='<%# Bind("DateCompleted") %>'></asp:Label> </ItemTemplate> </asp:TemplateField>
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.
View 4 RepliesI 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.
what is difference between server side submitting and client side submitting a form.
Can any one explain with an example.
I have a problem with the Ajax ComboBox from the Ajax Control ToolKit. When I want to erase the text in the ComboBox, I got this error:
"Microsoft JScript runtime error: '_optionListItems[...].text' is null or not an object". I only get this error when deleting the content of the Combox is the first action I do on the ComboBox. If I overwrite the text by entering something else before deleting this text, I got no error.
Is there one simple test that a person can do that covers all options where there could be a null, or "" value. When I google, I see so many options. I see:
if txtBox1.text IsNot nothing
if txtBox1.text.toString isNot nothing
if txtBox1.text <> ""
if txtBox1.text.toString <> ""
if isNull(txtBox1)
Is there on test that can cover them all?
I have a GridView with an asp:templateField where I am using an asp:lable to display a date. However, if the field is empty, I would like to display the message "Date Pending". How can I go about doing this?
Here is my GridView:
[Code]....
I have a FormView that is loaded with a records from my DB. Some of the fields may be blank or null. I am trying to check the value of some of the text boxes to verify that the user has updated the fields prior to allowing a DB update from the Edit Template.
I can not seem to get the correct syntax on the if statment to check the value of the text box....
[Code]....
VS2010 .NET 4 - This simple app works using my local system. When I publish it on an IIS 7 web server, I get this error when the application runs this Linq query with a containes function.
var results = view_UserInfoRepository.View_UserInfo.Where(x => x.Email.Contains(eMail)).OrderBy(x => x.Email);
Server Error in '/' Application.Value cannot be null. Parameter name: textDescription: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.ArgumentNullException: Value cannot be null.Parameter name: text Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[ArgumentNullException: Value cannot be null.
Parameter name: text]
System.Data.Linq.SqlClient.SqlHelpers.GetStringContainsPattern(String text, Char escape, Boolean& usedEscapeChar) +595083
[code]...
I'm working on an ASP.NET/C# app.
I have 2 text boxes and I need to validate if the input text for both of them are not both null
ex:
if(string.IsNullOrEmpty(TextBox1.Text) && string.IsNullOrEmpty(TextBox2.Text) ) //FAIL!!! else
that is, at least one txtBox has values
I was planning on using a custom validator but it seems that the validation function only gets called when something is written on the textBox i'm using has the 'control to validate'. Now, that doesn't work for me since I want to show an error message when both text boxes are empty. Is there a way to make the validation function to be called with, for example a postback? Or is there any other better approach to this case than the custom validator?
I have a number of nullable DateTime fields (Entity Framework model), and in my MVC view, I want to display custom text when the value is null. I would normally use the C# ? or ?? operators, but these can't be used unless I make all output occur in a response.write. Also, I need to handle existing DataAnnotations (like format string). It's all pointing to a helper method, or an extension method on Html. I am hoping there is a DataAnnotation attribute that I missed that covers this scenario.
Is there a way to use the <%: operator and have custom text for null values?
OK, I have exhausted myself troubleshooting this bug. The crazy thing is, I think I had it working months ago, and now it does not. All I want to do is submit FrmCart when the "Update Total" link is clicked. Below is the code.
[code]....
I have an ASP.NET web site with master/content pages. On the master page, there is a link to log-in and that brings up a modal jQuery form. How can I make sure that the info that is submitted on this form (which is just a DIV in my master page) is handled by a particular postback event?
Keep in mind that the modal can be submitted from any number of pages and I want to make sure that when the modal is submitted, the postback event of the content page is ignored while the postback of the master page handles the form.
how to preview the data before submitting using asp.net...
View 1 RepliesI want to display a blank text box if the date in the table is null. Any ideas on this using MVC 2 RC? 1/1/0001 12:00:00 AM displaying for Null DateTime in Html.TextBoxFor(model => model.IssueDate)
View 11 RepliesI'm not sure the best place to ask this...not even sure the best way to ask it.
I manage a library website, and there are a number of different database products that can be searched. I'm trying to build a black box application to sit behind the home page. Here's an example of what might get submitted to said application.
searchType = "books"
searchEngine = "library catalog"
keywords = "some keywords"
See, the idea is that I might be doing various search boxes throughout the site, and I want to keep the actual HTML forms as simple as possible and simply let an ASP.Net application do the rest of the work. For example, figuring out whether or not the search engine using a GET or a POST method, parsing the keywords to determine the best way to render them, and sending the appropriate hidden values.
Probably, most of these databases use GET, so I can simply use a Response.Redirect after creating the query string, but I think some of them might use a POST, and I'm just not certain how I would take the form variables from one page (the home page, say), then essentially turn them into a virtual form on this middle man/black box application, and then programmatically submit that virtual form to another site, such that the user never sees or knows about that intermediate page.
I've seen this:
[URL]
But that isn't what I actually want to do, because I don't want to retrieve the result of the submission through a WebResponse...rather, I want the form to actually send the user to the new site.
I'm quite confused about how to implement a many-to-many relationship and my domain model. Let's say I'm creating a recipe box web application and I have three tables called Category (categoryID, categoryName), RecipeCategory (categoryID, recipeID), and Recipes (recipeID, recipeName, recipeDescription). If I were to present this information as an ASP.NET application and wanted to insert a new recipe and category, am I responsible for writing the logic to insert the information in the RecipeCategory table OR is it possible to set RecipeCategory.categoryID and RecipeCategory.recipeID automatically with default values based on newly inserted records in the related tables? If I'm responsible for writing the logic to insert values in RecipeCategory.categoryID and RecipeCategory.recipeID is that a trigger? What's the best way of implementing this?
View 2 RepliesI am using the following code to download the file from web server
[Code]....
I have a web form(C#) which has many radiobuttonlist controls. For each control there is a corresponding field in a sql server database table. And finally there is a submit button.
How to send the selected values to the database?