I have a dropdownlist on my view that is being populated from values in a database table and I've added a "--Select One--" header. Selecting a value from this list is optional (it maps to a nullable field in my table). Currently, if a user doesn't select a value from the ddl then it inserts an empty string into the field, wherease I'd prefer to keep it NULL.
View 5 RepliesI am having a problem with disabling DropDownList based on the chice of 1st DropDownList, there is no post back occuring, and it is a template based web app here is the current code:
<script type="text/javascript">
$(function() { var dropDownList1 = $('#<%= ddlUserType.ClientID %>');
var dropDownList2 = $('#<%= ddlMember.ClientID %>'); dropDownList1.change(function(e) {
if ( jQuery("#ddlUserType").val() != "ETOC") dropDownList2.removeAttr('disabled'); e.preventDefault();
else
dropDownList2.removeAttr('enabled'); e.preventDefault(); }
} );
</script>
what is happening now is page is blank and if I remove the above code everything shows, where I am going wrong. here is the plain and final javascript code which worked:
<script language="javascript">
function CheckDropDownState(lstbox)
{
if (lstbox.selectedIndex == 3) { document.forms[0].ddlMember.disabled = 1; }
else { document.forms[0].ddlMember.disabled = 0; }
}
</script>
and thew .aspx code: <asp:dropdownlist id="ddlUserType" runat="server" onclick="CheckDropDownState(this);"></asp:dropdownlist>
Very often i write code like:
<img class="hasMenu" src="<%= (Model.Image==null)?Url.Content("~/Content/NoImage.jpg"):Model.Image.standard %>"
alt="Main image" />
Is there any predefined function which could beauty this code? Something like: ValueOrDefault(Model.Image.standard,Url.Content("~/Content/NoImage.jpg"))
I'm used to using VB.net for web programming.Often, I have something like:
Dim s as string = Session("s")
I get a string value for s from the web session. If there is no value in the web session, I get a blank string.However, AFAIK, in C#, I have to have something like the code below to do the same thing.
string s;
try { s = Session["s"].ToString(); }
catch { s = ""; }
have a form where I insert record via DetailView control. I have some string fields. For each string field (nvarchar in sql) I have defined the Default Value in the SQL SERVER (2008) as ''. Also I have added to each InsertParameter of the DetailsView a DefaultValue="".Yet still, if the user enters no value for one of the string fields, NULL is inserted into the table.
View 4 Repliesprogramming: C# 3.5
i have total of 20 questions in my sql table, it is consist of 2 type of questions:
1. Single answer -- the question that have only one answer.
2. Multiple answer -- the question that have multiple answer.
Using DataList( or another possible ways)
how do i manage to show radio button for Single choice, Check box for Multiple choice question ?
my sql data table
question_id(int) | question_type(char) | question_text | answer1(varchar) | correct1(bit) | answer2 | correct2(bit) | answer3 | correct3
desire effect:
///////Single Choice///////////////
1. This is the question, what is PPP ?
O asfasdasdfasda
O asdasdasdasdadasdasd.
O asdasdasdasdasda.
//////Multiple choice//////////
2. Following, which is correct ?
[] asdasdasdasd.
[] asdasdasdasdzxc
[] basdgwqsdasda.
I have several pages linked together that I want to maintain drop down selections for. I've seen a number of ways to do this with session values, etc, but I want to set the default value while still having the option of selecting other values.
Effectively, users will make selections on page 1 and then on page 2 they will use those same selections, but also potentially want to change their selections. My thought was that I could load the selections into a table in SQL in page 1 and then in page 2 call that table and set the values as variables. My question, then, is how I would set the default dropdown value to be a variable as opposed to a set value.
I am using VisualStudio2010 with ASP Webforms using C#.
I have a formview on a web page, set to insert mode as default. The form view is bound to a SQLDatasource. This datasource has a custom query written to select the details for this formview. The query joins two tables to provide relevant detail and not just an ID for one of the elements on the form view.
The first tabe contains information regarding projects and the second table contains detail regarding Resources. First table has the following definition:
[Code]....
I am drawing a blank and need some direction.I am putting together a simple website that has a single DropDownList that is DataBound to table inside of a FormView Template.What I want to happen is when the page loads, it runs the SELECT statement and displays that result(which it does, so that part works).Where I am stuck is that if I Click the DropDownList and select another item, and display the results of that selected item in the associated Databound controls.My code is below;
[Code]....
[Code]....
On update the dropdown value shows NULL in database : here's structure for my gridview
<asp:TemplateField HeaderText="Construction Phase" SortExpression="Phase_Name">
<EditItemTemplate>
<asp:DropDownList ID="EditedDropDownInGrid" runat="server" CssClass="form-control" DataSourceID="PhaseSQLDataSource" DataTextField="pp_name" DataValueField="pp_id">
</asp:DropDownList>
</EditItemTemplate>
[Code] ....
It updates other controls in gridview but does not update my selected dropdowns item value in Integer format which is inside gridview...
I have Patient details form. From that I am storing the data to DB using Stored Procedure.In table, all fields are allowed null except Primary key.When I store data, then I will stored using .Text property.For non-mandatory field, if text box value is "" then it will stored, but in case DropDownList if I pass empty string ("") to DB then it will show me error as "Input string was not in correct format" Why?I have used DropDownList's SelectedItem.Text and SelectedValue . But in both case it show me the same error.Is there any case to pass default value of DropDown value as NULL?Note : I am using LINQ. (.NET FW 3.5) and SQL Server 2008.
View 16 Repliesi am using a gridview in my web page,i used to bind the database records to the gridview..my columns are name,empid,company name,pl leave,sl leave,total leave taken here total leave taken is not a database fields,in the page i want to fill the records once loaded pl leave and sl leave is added and display in the total leave taken column..it working properly when all pl ans sl columns fill with numbers,if some pl and sl leave having blank values.it showing an error like input sting was not in correct format..this is my code
<Columns>
<asp:BoundField DataField="slno" HeaderText="SerialNo"
SortExpression="slno" />
<asp:BoundField DataField="ecode" HeaderText="Employee Code"
SortExpression="empcode" />
<asp:BoundField DataField="ename" HeaderText="Employee Name"
[code]....
i dont know how to set the field to blank field instead of null
if i insert record, and don't input some field, then the field will display null
how to remove null value by default in mysql db.
I have a typical gridview/formview master control setup. When I try to update or insert I don't get any errors but it also doesn't work. When I try to insert data all I get are null values and when I update, none of the values are updated. The formview looks like its working, but just doesn't. The primary key is an identity and it auto-increments by one.
[Code]....
Using dropdown in gridview and bind the values in dropdown then based on dropdown display the value in another column.
View 1 RepliesI have a databound dropdownlist, bound to an object datasource. I want to have a default value of "None" inserted at the top of the list and I would like to do this declaritively if possible. After much googling I came up with the below code. However it does not display my default item. I was under the impression that setting the AppendDataBoundItems to True would solve this, however it hasn't.
<asp:DropDownList runat="server" ID="ddl" DataSourceID="ldsCompany" DataTextField="CompanyName" DataValueField="CompanyId" SelectedValue='<%# Bind("CompanyId") %>' AppendDataBoundItems="True">
<asp:ListItem Value="DefaultValue" Text="DefaultText"/>
</asp:DropDownList>
I am trying to set a default value for a dropdown from which i have an SQL datasource, heres my code:
<asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource1" DataTextField="name" DataValueField="name"></asp:DropDownList>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="..." SelectCommand="SELECT [title_id], [name] FROM [tbl_job_titles]"></asp:SqlDataSource>
I tried adding this:
<asp:ListItem Selected="True" Text="All" Value="All">All</asp:ListItem>
but it didnt work..
is it possible to change the default date values accepted by sql server to dd,mm,yyyy instead of the default mm,dd,yyyy?
View 3 RepliesI have a repository function called getList which retrieves certain information that gets posted to it from a form. My form has 6 fields, and a user can enter searvh criteria in any or all the fields. According to what he has entered, I must execute a SQL string to retrieve matching information.
I have the following:
[Code]....
But, if a user enters only a surname, my query will return no results. Is there a way format my sql string to allow default values, or maybe build the sql string at runtime. In MS-SQL it was easy to do, but how would one do it in LINQ??
protected void rptNavigation_ItemDataBound(object sender, System.Web.UI.WebControls.RepeaterItemEventArgs e){
if (!((e.Item.ItemType == ListItemType.AlternatingItem) || (e.Item.ItemType == ListItemType.Item)))
{return;
}string Name = string.Empty;
if (IsDBNull(e.Item.DataItem["FullName"])) {
Name = String.Empty;}
else {Name = (string)(e.Item.DataItem["FullName"]);}
Literal ltlLiteral = (Literal)(e.Item.FindControl("ltlLiteral"));
ltlLiteral.Text = Name.ToString();
I get error for IsDbNull - Error 1 The name 'IsDBNull' does not exist in the current context. What's the best way to check for null values returned from db? also I get errors on both lines where (e.Item.FindControl(ltlLiteral")); is present ERror: Cannot apply indexing with [] to an expression of type 'object'
Using Combobox in my webpage, in a combobox i want to display a null values first, then it should display all values..
Combobox.item = null values
combobox.item = 1
Combobox.item = 2
cmd = new OdbcCommand("Select vehicleno as vehicleno from tb_car", con);
ada = new OdbcDataAdapter(cmd);
ada.Fill(data1);
cmbvnoview.DataValueField = "vehicleno";
cmbvnoview.DataSource = data1;
cmbvnoview.DataBind();
Above code is working, but is displaying all the values, first it should display a null value, then it should display all the values.
I want to know how to handle null values....
for eg i hav a datetime field called Completion date which temporarily has a null value and when i display the records using a gridview it displays a default date...how do i get rid of this default date.the completion Date gets entered at a later stage in the application following which the gridview should show this date....but initially it shouldn't show anything
info.Text += " Filiale " + oUser.Filiale.Filialnummer;
View 6 RepliesI have a dropdownlist that is being populated using linq. The code for linq is below
[Code]....
When the page is viewed the dropdownlist show the following;towels, shoes, etc. What I would like is the default item to be nothing. That is when the page is viewed then the drop down list should show something like this "select category". Right now it is starting by showing towels, which is quite irritating, since if I want to see towels I first have to select something else and then go back and select it!
I have a dropdown list which I bind through a datasource. How can I inject a default value to it? My db doesn't have a default value and changes are not permitted!
View 6 Replies