How can I validate that at least 1 radio button is selected?
If all the radio buttons are part of the same RadioButtonList, you can use a simple RequiredFieldValidator. Here's an example of that:
<asp:RadioButtonList
ID="RadioButtonList1"
runat="server"
RepeatColumns="3">
<asp:ListItem>Red</asp:ListItem>
<asp:ListItem>Yellow</asp:ListItem>
<asp:ListItem>Blue</asp:ListItem>
<asp:ListItem>Green</asp:ListItem>
</asp:RadioButtonList>
<asp:RequiredFieldValidator
ID="ReqiredFieldValidator1"
runat="server"
ControlToValidate="RadioButtonList1"
ErrorMessage="You must Select your favorite color!">*
</asp:RequiredFieldValidator>
If you have RadioButtons in different RadioButtonLists and you want to validate that at least one is selected across multiple lists, then you would need a CustomValidator.
Another way might be if you checked one of them by default, during pageload (maybe the one you think most users will select) then the user will be "forced" to change the selection or continue with the default option, in this way you make sure there is always an option selected.
Related
I have a page with five RadComboBoxes on them. When the page loads I am able to click inside any of them which begins to search the contents of the combo box.
If I select an option from the dropdown list (regardless of whether or not I narrow the search by typing), I am left unable to type within one of the other four RadComboBoxes unless I click out of the box and back in again - I can however select an item from the dropdown as usual.
Alternatively, if type in the first box without actually selecting an item, and then click in another RadComboBox I am able to type to search.
<telerik:RadComboBox ID="ddApplicant" runat="server" DataSourceID="SqlDataSource1"
DataTextField="Clinicians"
MaxHeight="180px" Filter="Contains" DataValueField="ClinicianID" HighlightTemplatedItems="True"
Width="350px" EmptyMessage="Search By Clinician Name"
ItemsPerRequest="10" DropDownWidth="350px"
AutoPostBack="True" CausesValidation="False" AppendDataBoundItems="True">
</telerik:RadComboBox>
Am trying to disable my comboboxlist when I press a specific selection from my radiobutton list, or re-enable the comboboxlist If I make a different selection from radiobuttonlist.
Am using postpacks in my asp as well, but am I cant find how to make this work.
When I double click the radiobutton list and I get the automatic method generation.
I don't know what kind of attributes should I use to make the radiobuttons work when changed. I tried a few combinations but none seems to work. Any ideas?
use AutoPostBack="true" property as follow
<asp:DropDownList ID="MyDropDown" runat="server" AutoPostBack="true"
onselectedindexchanged="MyDropDown_SelectedIndexChanged">
and
<asp:RadioButtonList id="docList" runat="server" AutoPostBack="true"
OnSelectedIndexChanged="loginUser" />
For some reason, I can't get the validator to raise a flag when I do things wrong.
<asp:DropDownList ID="ddlTypeList" runat="server" DataSourceID="ods_TypeOptions" DataTextField="name" DataValueField="id" SelectedValue='<%# Bind("Type") %>' AppendDataBoundItems="true">
<asp:ListItem Text="-" Value="-1" Selected="True"></asp:ListItem>
</asp:DropDownList>
The drop down list has nice values, incl the initial dummy.
Neither
<asp:RequiredFieldValidator ID="rfw" runat="server" ControlToValidate="ddlTypeList"
InitialValue="-1" ToolTip="Required">*</asp:RequiredFieldValidator>
Nor
<asp:CompareValidator ID="cv" runat="server" ControlToValidate="ddlTypeList" ValueToCompare="-1" Operator="NotEqual" ToolTip="Required">*</asp:CompareValidator>
Raises any flags to say "hey - u messed up, go fix it". For all the google, searching, reviews, swinging big hammers, I have yet to spot what I am doing wrong.
I just want one solution to fix them all.
Oh yes, I also had a ValidationGroup="myGroup" between the DDL, RFV/CV and the button. No luck.
Your code is correct. You must have some element of code or markup that is obstructing the functionality of the validator. Is it possibly that the "-" item has its value changed from "-1" to something else?
Verify that your button that submits the form has CausesValidation=True.Also, make sure that the parent of the validators is not set to Visible=False or the children will not render on the page.
Verify that the RequiredFieldValidator and CompareValidator are rendering in the markup by searching for "_cv" or possibly "cv" in the outputted markup. If it is not there, then one of the parent elements is not being rendered or the validators are being deleted.
I have one dynamic grid. In that amount and date are not null columns.
<asp:TemplateField>
<ItemTemplate>
<asp:RequiredFieldValidator ID="reqAmount" runat="server"
ControlToValidate="txtAmount" Display="None" InitialValue=""
Visible="true" ValidationGroup="req" SetFocusOnError="true">
</asp:RequiredFieldValidator>
</ItemTemplate>
</asp:TemplateField>
The user should enter something in the specified columns. My issue is that if the save button is pressed the required validator is firing for all the rows that are empty. It should only show if the user is in the current row. If the user leaves the particular row empty and presses the save button the error message should show in the current row, not all the rows.
How do I do this?
You can find what you are looking for at
GridView Examples for ASP.NET 2.0: Editing the Underlying Data in a GridView
A typical situation:
In my GridView control, I have a Footer row which contains a Textbox and an "Add" Button. When the button is pushed, the Text entered in the TextBox is added to the grid. I also have a validation control to require that, when the button is pushed, that text has been entered in the TextBox. After a new row is added, the textbox is clear to allow for easy entry of the next item.
The user may also edit the text in previously entered rows by clicking the Edit LinkButton, which puts the row into edit mode. Clicking an Update LinkButton commits the change.
The problem:
When, I click the Update link to commit the changes, if text has not been entered in the Footer row's TextBox (the row used to add a new entry), the validation control returns a "Entry Required" error. It should only require an entry if the Add button is pushed, not if the Update LinkButton is pushed.
It seems that the server side Validation control's validating event fires before the GridView's RowCommand event or the btnAdd_Click event, so I am wondering how, from the server, I can determine what event fired the postback so I can determine whether what edits should be performed for the given situation.
I am using a mix of client side "required" validation edits as well as more complex server sides. Since I probably have to have some server sided validations, I would be happy with just knowing how to handle server sided validations, but really, know how to handle this situation for client validations would also be helpful.
Thanks.
Convert your CommandField into a TemplateField, and in the EditItemTemplate, change the Update LinkButton's CausesValidation property to false.
Update:
Converting to a TemplateField is simple and doesn't require any code changes (just markup):
Changing the CausesValidation property to false in the markup is also straightforward:
<asp:TemplateField ShowHeader="False">
<EditItemTemplate>
<asp:LinkButton ID="lnkUpdate" runat="server" CausesValidation="False"
CommandName="Update" Text="Update"></asp:LinkButton>
<%--
More controls
--%>
</EditItemTemplate>
<ItemTemplate>
<%--
Controls
--%>
</ItemTemplate>
</asp:TemplateField>
Now, if you want your footer and data rows to be validated separately, you need to use validation groups, which is explained in Microsoft's documentation. All the controls in the same validation group will have their ValidationGroup property set to the same value, like this:
<asp:LinkButton ID="lnkUpdate" runat="server" CausesValidation="True"
CommandName="Update" Text="Update" ValidationGroup="GridViewDataRowGroup">
</asp:LinkButton>