Web Forms :: Dropdowns Validations - Make Sure That User Has Selected Something From The Dropdowns Otherwise Can't Proceed

Dec 6, 2010

I am using panel to hide and display certain controls on a page, On one of my panel i have three drop down, all i want is to make sure that user has selected something from the dropdowns otherwise they cant proceed, i am using the requiredfield validator but its just not working

[Code]....

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I have 3 dropdowns in my VB.Net 3.5 web app. After a user selects a value from the first (let's call it Countries) the second (called States) should populate correspondingly. Dropdown three (cities) should also cascade down after a State is selected. The Countries and States dropdowns have SQL DataSources. The Cities dropdown has to call 2 procs (based on the selected State value) so it does not have a SQLDataSource. My question is, the code below works for Countries and States, however, I cannot ge the Cities to populate...

<asp:DropDownList ID="drpCountries" runat="server" DataTextField="CountryName" DataValueField="CountryId" DataSourceID="sdsCountries" AutoPostBack="true">
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<Triggers>
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<SelectParameters>
<asp:ControlParameter ControlID="drpCountries" Name="StateID" PropertyName="SelectedValue" DefaultValue="" />
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THIS DOES NOT WORK:

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[Code]....

Heres my code from my page load event:

[Code]....

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[code]...

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<
asp:ListItem
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Value="*"
/>
"
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[Code]....

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I have a sample app below

[Code]....

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[Code]....

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.ASPX code:

[Code]....

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[Code]....

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[Code]....

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I've been trying to figure out the issue and knowone seemd to know. I put a dropdown on my page and when I view it from my server, it works fine. When I tell it to go and get it's values from a DB I can no longer see it on the page when I view it from the server. Here's the code I have for it:

<td
class="style28">
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/>
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<asp:AccessDataSource
ID="AccessDataSource1"
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So I am using a formview that gets in Update mode with a bunch of values from a sqldatasource --- but I want to fill a couple dropdowns with data from the database --- but I cannot figure out how to bind the data to the dropdown box FIRST and then select the value in that dropdown box... but I keep getting an error that the Selected value is not a part of the dropdown (I assume because the sqldatasource is trying to bind BEFORE I can get the dropdown box bound).

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It seems when including a DropDownList in an Editor Template (or a Partial with a HTML prefix) then following code does not select the correct item in the list:

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I have a web flow (asp.net) which has a drop down and a check box.

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and what type of controls do we need to acheive this.

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I have an problem with dropdowns and validation. With MvcValidation it worked perfectly, since upgrade to jquery the validation for the dropdowns fail. Example:

[Code]....

If I click the submit button als fields are validated, except the dropdowns...why?

Btw. how do I add dynamic validation for dynamic forms in jquery? I know that it was something like class="required" as an html attribute in former days.

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I'm having a problem with a dropdown throwing an error:

Uncaught Sys.WebForms.PageRequestManagerServerErrorException:

Sys.WebForms.PageRequestManagerServerErrorException: Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.Only Sometimes.

I am using an updatepanel, with a bunch of dropdowns that have an onchange for Javascript, that use ajax (partial page postback). The problem is: I have two dropdowns at the top (also inside the updatepanel) that let me change the current month or year. Sometimes...they change the page (response.redirect), and sometimes they throw that error above. Also, they are the Only two buttons on the page that aren't doing an "onchange" and then ajax stuff....they are actually posting back the entire page to the server (or trying to).

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