Web Forms :: Changing Backcolor Of Textbox When Input Is Invalid?
Feb 11, 2011
I have an ASP.net page with two textboxes where the user types in input. I applied a requiredfieldvalidator to both textboxes as well. However, I also want the textboxes to change to a backcolor of red if the form is invalid when the user clicks the button to submit the input. I tried this code below in tthe button click event, but doesnt work...
If Page.IsValid = False Then
txtCosts.BackColor = Drawing.Color.Red
txtRevenue.BackColor = Drawing.Color.Red
End If
How else can I change the Backcolor of the textboxes when the input is invalid.......
I have a gridview control that has a different background color for alternating rows (done using cssclasses). In the RowDataBound event code, I want to change the background color of a ListBox control in one of the cells to match the row color. I have tried the following (in blue), but it does not seem to work. The listbox control still remains with white background. How may I determine the background color of the row so that I may set the ListBox background to match?
[Code]....
A corollary question is, "How may I programmatically reference an item within a CssClass?" For instance the CssClass is named "datagrid." How do I programatically retrieve the value of "background-color" that is defined in this CssClass?
I have created an iframe which contains the label, "powered by MyWebsite.site" The "iframe itself" accepts arguments, so other webmasters may customize the appearance of it.
The problem is that since the background of the iframe could be customized, anyone can "vanish" the "powered by MyWebsite.site".
So what option do i have? How should i dynamically change the label color depending on any background?
What I need to do is perform some kind of decision statement and when true I need to change the backcolor of a treenode to grey, so that it has a grey box around the whole text. There is no backcolor property for the tree node and I don't need it applied all the time so I don't think a CSS class will do this.
When i execute this page i am getting the following error.
Specified cast is not valid. Description: An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.InvalidCastException: Specified cast is not valid.
I have two textboxes,Suppose I leave the textbox1 empty & press the button,Then alert is there enter value in Textbox1,When the user press ok,Focus is set to dat textbox,I want also to change the backcolor of dat textbox--I think so it is simple,Now when i enter the values in First textbox & press tab to move to second textbox,I wnat the first textbox color to be changed to white.
How do I change the BackColor of the textbox area in an asp.net DropDownList from white to another color? The Backcolor property changes only the drop down section.
I have a gridview which contain textboxes in it. I have database which contain column color, there are multiple color values in database table. While binding gridview, corresponding color should be assign to corresponding textbox in gridview. How can I do that?
I'm using a searchoption on my website. (language = VB)
The user can choose a searchcriteria out of a dropdownlist (Artist name, Description, Price, Genre, Type) . If the user selects one of the options in the dropdownlist the correct textboxes are shown.
For example: if the user selects Price he gets two textboxes (one for the min price and one for the max price) if the user selects Artist Name he gets one textbox
The dropdownlist and the textboxes are put into an updatepanel. The searchbutton is outside the updatepanel.
Now for the problem:
If the user doesn't fill in a textbox and presses the searchbutton, the backcolor of that empty textbox should be turned red. The searchbutton is set as a trigger and the panel is updated on the buttonclick, but the colors don't show.
In the clickevent of the button I've said the following code:
If txtCriteria.text = "" then txtCriteria.backcolor = Red Else txtCriteria.backcolor = White End if
Quite a simple piece of code. This works if I remove the updatepanel from my page, but I'd like to keep the updatepanel because it's really nice :p.
Since I'm new to coding and I'm trying to understand why here is a little more detail on the question.If you have a text box and you are limiting the input to say 2 charactrs do you really need to validate the input further? What I have is a text box that has a max length of 2. Is there a security reason to add a validator to the textbox. I should add this is in Asp.net.
When changing the textbox's text mode to multiline the textbox becomes resizable during runtime. I can't seem to find the property to disable this, does anyone know how I can resolve this issue?
I'm using Data Annotations and Metadata attributes in my models to do automatic validations on my forms. Any who, I've got a problem where I have an int field I need to change the error when a letter is entered. Im guetting the default error: "The value 'A' is not valid for Número.". But since this is a spanish web, i need to change the error to something in spansih. Any who, I cant find where to change the ErrorMessage="" to what I need.
I have static html paypal buynow button that works great, but it's static.
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But it is possible to change the values for the hidden inputs from .net codebehind code? I found this post which takes a different approach of sending these hidden fields instead as a query string to paypal. Not sure I like that though as would this not possiby explose some of those fields like the return page?
Basically what id like to do change the important parts of the button and info I'm sending to make it dynamic.I know I can do something like this in the markup, but that would mean having to fetch data mulitple times was hoping I could somehow adderss the field values directly in the codebehind. Or possibly dynaically generate and insert the entire changing input type fields from the codebehind
Possible to add them with something like this: myform.Attirbutes.Add (???). If so how do I contruct these input types in .net?As far as return logic security, I've tested that it's solid, i just need to automate the button process so I don't have to create a buy now page and button for each product.
Where that comment in the code-behind file says "REFERENCE IN CODE HERE", that is where I want to set the value of the "remLen3" input (client-side control) to "30 characters left."I obviously left out irrelevant things like inserting the txtNewComment.Text into the database. But what's going on here is when the user types in something into the txtNewComment text box, I'm using javascript to change the value of the remLen3 control.My problem is that when I submit the text from the txtNewComment textbox to the database and set the txtNewComment.Text equal to Nothing, I don't know how to reset the remLen3 field value back to saying "30 characters left.". I already tried to add a "runat="server"tag to it, but when typing stuff into my txtNewComment textbox it gives me an error. I already tried to figure out what the error meant, so I'm not going to spend time trying to solve it anymore; I would rather just see if there is a workaround to using the runat="server" tag. Maybe do some kind of a CType(FETCH_REM_LEM3_HERE_SOMEHOW, INPUT_TEXT_TYPE??).value = "30 characters left". If there is a way of converting the input text control (remLen3) that way, then how would that be done? I just want to change the value of that field when the server-side button is pushed.
I have a webform with difrent parts in it, its like a search criteria, noissues with other parts but theres one part in it called guest profile which is giving me problems.There was a field name called guest company with a textbox by its side, when the user enters the company name and clicks enter it displays the list of people with that company name
but now I have changed this textbox to ddl and populated this ddl with the company names now when I am selecting this company name and clicking enter its not showing the data the code for the above issue is shown below I have also posted the stored procedure used in this
the code used to design the DDL
<tr> <th> Guests Company: </th> <td> <asp:DropDownList ID="ddlCompanyName" runat="server" CssClass="default" /> </td> </tr> the code used to bind the data to this ddl protected void BindCompanyDDL() { var companyList = Company.FindAll(); ddlCompanyName.Items.Add(new ListItem("- Select Company -", "")); foreach (var companyDetail in companyList) { ddlCompanyName.Items.Add(new ListItem(companyDetail.Name, companyDetail.Id.ToString())); } ddlCompanyName.DataBind(); } the code used to initialize search public void InitializeSearch(ref RecipientSearchParams searchParams) { if (!String.IsNullOrEmpty(txtGuestName.Text)) searchParams.GuestName = HttpContext.Current.Server.HtmlEncode(txtGuestName.Text); if (ddlCompanyName.SelectedValue != String.Empty) searchParams.CompanyName = ddlCompanyName.SelectedValue; if (ddlCompanyType.SelectedValue != String.Empty) searchParams.CompanyType = ddlCompanyType.SelectedValue;
the code used to load parameter values
public void LoadParamValues(RecipientSearchParams searchParams) { if (!String.IsNullOrEmpty(searchParams.GuestName)) txtGuestName.Text = searchParams.GuestName; if (!String.IsNullOrEmpty(searchParams.CompanyName)) ddlCompanyName.SelectedValue = searchParams.CompanyName; if (!String.IsNullOrEmpty(searchParams.CompanyType)) ddlCompanyType.SelectedValue = searchParams.CompanyType; public interface IAudenceTab { bool ValidateSearch(); void InitializeSearch(ref RecipientSearchParams searchParams); void LoadParamValues(RecipientSearchParams searchParams); } private void PopulateGuestSqlParams() { if (!String.IsNullOrEmpty(GuestName)) { AddHashValue("GuestName", _GuestName); Description += String.Format("Guest Name {0}; ", _GuestName); } if (!String.IsNullOrEmpty(CompanyName)) { AddHashValue("CompanyName", CompanyName); Description += String.Format("Company Name {0}; ", CompanyName); } if (!String.IsNullOrEmpty(CompanyType)) { AddHashValue("CompanyType", CompanyType); Description += String.Format("Company Type {0}; ", CompanyType); } public List<Person> ExecuteSearch() { PopulateSqlParams(); MSSqlDBProvider db = new MSSqlDBProvider(); SqlConnection conn = db.GetConnection(); List<Person> pList = DataObjectProvider<Person>.GetObjectList("dbo.PersonNewsletterFilterSearch", CommandType.StoredProcedure, pHash, conn); return pList; } stored procedure used (@GuestName IS NULL OR p.FullName LIKE '%' + @GuestName + '%') AND (@CompanyName IS NULL OR p.ID IN ( SELECT Distinct compGuest.GuestId From CompanyGuest compGuest Inner Join CompanyDetail compDetail on compGuest.CompanyId = compDetail.PersonId where compDetail.[Name] = @CompanyName )) AND (@CompanyType IS NULL OR p.ID IN ( SELECT Distinct compGuest.GuestId From CompanyGuest compGuest Inner Join CompanyDetail compDetail on compGuest.CompanyId = compDetail.PersonId where compDetail.[Type] = @CompanyType)) AND
I have a textbox called "tax rate" which I need to validate the input... The only thing I need to ensure is that the value entered is a number (decimals ok of course). eg. the input might be "8.75" How do I write the validation expression?
I have a TabContainer that has a button in one of the tabs. When i click on the button, I need to save a few items to the database and then select a different tab.
In both instances, I receive a scripting error message "Invalid argument." from the file "ScriptResource.axd".
After continuing or ignoring these errors (ussually three of them), the page finishes refreshing and the correct tab is selected. I'm just not sure how to get rid of these error messages or why I get them.
I've got a regular expression validating that a Textbox.text is a number but i would like to treat the input as a number what is the conversion method to change the textbox.text string into int?
