Dropdownlist - Reload Dropdown?
Sep 17, 2010
I have a dropdown which shows filesnames and when the index is changed, the slected file is offered for download. I also have a button which creates new files ... now after a new file was created, the new filename should also be shown in the dropdown. It works fine, when I refresh the page, but this is not what I want. I tried putting the dropdown in an updatepanel and giving it the file create button id, it failed ... is this the correct apporach or is there an easier way?
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Similar Messages:
Feb 3, 2011
I am populating a dropdown on page load and the user selects an item, click a button (to create a new site in sharepoint) I then want this new site to be shown in the dropdown but I can't get it to work properly. Either the items are duplicated or the selected value is null.
so on page_load I have
getSites();
if the page is a postback I want to reload the dropdown with the new item
if(Page.IsPostBack)
{
getSites();
}
but this of course duplicates all the values so I tried
if(Page.IsPostBack)
{
ddlSites.Items.Clear();
getSites();
}
But even if the site is reloaded with all the items and I select one the value is null, why is that and what should I do to fix this problem?
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Feb 21, 2011
I add cascading drop down in a place holder during page load. When i submit the entire form, i found out that my drop down list is reload and my selected value is not selected.
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Jun 10, 2010
i think i can't see the forrest for the trees.......there HAS to be a simple way to do this. so i created a web page and on that page i have two dropdown lists. the first is STATE and the second is COUNTY. the STATE is a static list. but the COUNTY is generated whenever the STATE changes. now....when i set up the COUNTY dropdown list, it prompted me for a datasource. i have a store procedure which takes the 2-letter STATE code and returns all the counties for that state. so i set up the datasource for the COUNTY drop down list by just following the prompts from visual studio. i gave it a default state of Alabama (AL). and all is fine. so here's my question: how can i reload the datasource and subsequently the COUNTY dropdown list? i see no way to access the datasource that the environment generated for me.
well.....i thought.......i'll just do it the old fashioned way and set up a command.......connectionstring.......and sql statement and load the results into a datareader (do i REALLY have to do all that?)
but it still doesn't work. what's the simplest way for me to just re-fire my stored procedure and pass it the STATE parameter and reload the datasource and dropdown list?
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Jun 22, 2010
i have dropdownlist. After i loaded data from javascript to dropdownlist,i used dropdownlist.item.count but counter always null. how to refresh dropdownlist?
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May 14, 2010
I removed some items from a dropdownlist, and now I want to re-initialze the items which I have on aspx file.
<asp:DropDownList ID="s1" runat="server">
<asp:ListItem Value="0.00">Select</asp:ListItem>
<asp:ListItem Value="0.25">0.25</asp:ListItem>
<asp:ListItem Value="0.50">0.50</asp:ListItem>
<asp:ListItem Value="0.75">0.75</asp:ListItem>
<asp:ListItem Value="1.00">1.00</asp:ListItem>
<asp:ListItem Value="1.25">1.25</asp:ListItem>
<asp:ListItem Value="1.50">1.50</asp:ListItem>
<asp:ListItem Value="1.75">1.75</asp:ListItem>
</asp:DropDownList>
Such as I removed "1.50" and "1.75", and when a button clicked, the dropdownlist will initialze again with these 8 items. How do I do that?
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May 19, 2010
I have a cascading dropdownlist. The first drop down is for Departments and is databound on PageLoad from the database. The user then selects a department and the second dropdown is populated with the appropriate sub departments via JQuery/JSON which calls an httphandler. The problem is as follows: I select a department and the subdepartments are filled.
I finish what I'm doing on that screen and everything is fine. But then if I go to a different screen and add an additional subdepartment then come back to original screen, the new sub department won't appear in the cascading dropdown. I have to close the browser and restart the session in order for any new sub departments to appear even though they are in the database. I put a breakpoint in the httphandler and noticed that it is only called once per session per each department in the first dropdown. I don't know why this is happening. I want it to call the httphander EVERY time the index of the department dropdown is changed.
[Code]...
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Jan 28, 2011
I have a drop downlist,and next to it there is an MS bar chart.i want to change the datate of the MS chart ,once the user selects another year from the dropdownlist.
When the page loads ,the chart displays the default year(2011) and it works.The problem is that is does not change the data when you select another year from the dropdownlist.
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Jun 28, 2010
In MS Access there is a great method call 'dropdown', you set the focus to the control, mycontrol.setfocus and then call mycontrol.dropdown, really useful when using cascading dropdowns.
Is there a similar method in asp.net or how would I get the dropdownlist to dropdown through code?
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Aug 12, 2010
how can I set the dropdown width of my dropdownlist just like in application project combobox?
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Aug 10, 2010
I have a DropDownList on an ASP.NET page that gets populated by a SQL database.
<asp:DropDownList ID="ddlName" runat="server"></asp:DropDownList>
The population is down in the code behind file:
ddlName.DataSource = SqlDataSource1;
ddlName.DataValueField = (this.ddlName.SelectedValue);
ddlName.DataTextField = "ccName";
ddlName.DataBind();
I was wondering if it was possible to change the background or text color of an item in the list based on it's value? I just noticed that the example below works when the page first loads but on postback the text color disappears even though that is where the code is. Is there something I am missing?
protected override void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ddlName.DataSource = SqlDataSource5;
ddlName.DataValueField = (this.ddlName.SelectedValue);
ddlName.DataTextField = "ccName";
ddlName.DataBind();
foreach (ListItem item in ddlName.Items)
{
if (item.Value == "Item 1")
{
item.Attributes.Add("style", "color:red");
}
if (item.Value == "Item 2")
{
item.Attributes.Add("style", "color:red");
}
}
}
}
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Jun 21, 2010
I'm using entity framework and i have a problem that this dropdown ignores my changes / does not reflect db.
<asp:FormView ID="FormView1" runat="server" DataSourceID="edsFoo" >
<asp:DropDownList ID="myDD" runat="server" AppendDataBoundItems="true" DataValueField='<%# Bind("something") %>'>
<asp:ListItem Value="0" Text="NO" />
<asp:ListItem Value="1" Text="YES" />
<asp:ListItem Value="2" Text="PARTIALLY" />
</asp:DropDownList>
</asp:FormView>
'Something' (in binding) is an int and it's 1. When the form is started, I always see NO, although the value coming from EF is 1.
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Feb 17, 2010
I am generating a dropdown list in codebehind and cannot get the selectedindexchanged event to fire automatically. It works fine when put directly into the ASPX page, but I need it to be in the codebehind.
This doesn't work -
[code]....
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Aug 27, 2010
I have many controls on my form, but in particular, I have 2 dropdownlists. 1 dropdown list has 2 values, and each value controls what the second dropdownlist displays. This is an edititemtemplate and both dropdowns have the selecteditem set via '<%# Bind("fieldname") #>' on page load.
THe problem is, if I change the value of the first dropdown, it errors out because the second dropdwon has a bound value that is no longer acceptable.
Can I cancel the bind of the second control, if the the first one is changed? I would like to cancel the bind, and update the values by using a different datasource depending on the value of the first dropdown or hardcode the new values.
If Dropdown1 has a value of "A" for example Dropdown 2 Shows Values "1", "2", "3"
If Dropdown 1 has a value of "B" , Dropdown2 Shows Values "4", "5", "6".
It binds fine initially, but if I change Dropdown1 from A to B, I want Dropdown2 to show the new values, maybe with a default of "Select an Item" and not error out b/c it's attempts to bind a value of 1, 2, or 3.
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Sep 10, 2010
Have spent hours trying to create a Dynamic Data Field Template holding a DropDownList which is extended by the AJAX Cascading DropDown extension.Final form holds multiple cascading dropdown boxes. User selects Country (Land) then Postcodes, Counties (Provincie) are populated. Once postcode is selected then towns (Plaats) are populated. The problem I am now facing is that the viewstate for the dropdown lists is not being saved/restored after an insert action or custom validation error. So basically the dropdown lists are being reset to their default values.Some code (if missing parts, just ask and I will post them) - Don't mind the code structures etc... needs some refactoring :)Attribute I created:
[Code]....
KlantMetaData (=> Klant is Dutch for Customer ):
[Code]....
DynamicDropDownList Control I created:
[Code]....
Dynamic FieldTemplate created for inserts:
[Code]....
EntityTemplate I created:
[Code]....
Webservice methods created:
[Code]....
Code in masterpage:
[Code]....
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May 14, 2010
I am currently writing an MVC app and currently only have one master page. I would like to add a dropdownlist to my main page and on selection of this to be able to switch the master page used. Has anyone acheived this before. I am unsure of how to force the onchange in the dropdown to fire some code behind in my controller.
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Jul 10, 2010
i have dropdownList Binded to a data source and its working fine But want i want to do is when the page loads its initial value should Blank until clicking the dropdown button
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Oct 9, 2010
How to populate dropdownlist in a gridview by selecting another dropdown in same gridview
i tried the code in driiopdownlist selectedchanged
dropdownlist d=(dropdownlist)gridview.findcontrol("dropdownlist1") but it gives null
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Jun 11, 2010
I need a develop a smart dropdown list for an inhouse application
Let assume, i have a dropdownlist with the following values:
ABC
EDF
XYZ
A123
B456
Now when the user types A in the drpdownlist (we can type anything onthe dropdownlist, but we can superimpose a textbox on it), the dropdwn list should sort itself and show only ABC and A123.
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Aug 19, 2010
i need a information of how to avoid the reload source editor window for after xml file save using Asp.net
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Feb 24, 2010
I have a page which contains a button that perform the following code, I want to reload the page after the response end so that update a grid in that page. or suggest a way to update the grid after response end.
[Code]....
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Aug 16, 2010
is it possible to use Ajax with ASP.NET MVC 2 to reload a user control, pass along a new Model and have it update all the values that make use of this model without refreshing the rest of the site content?
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Sep 20, 2010
I have an XML file and I save some of my application settings in that. read this xml file and cache it in memory, If i change the setting i want to read the latest change from xml file but how can I know that, xml file is changed ?Im running this app in the web context (asp.net)
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Jan 15, 2013
I've been playing around with a .NET ActiveX control in a web page as a possible solution to a particular situation. I set up a .NET user control project, added some UI controls, and eventually got the DLL to load in Internet Explorer and run. However, I've run into two problems.
1) I've tested it on two Win XP PC's, one with IE7 and the other with IE8. Everything works fine in IE8, but I get various permissions errors in IE7. Both machines have the same security settings in IE (it's in the trusted site zone, all ActiveX relating settings are the same, etc.). Does IE7 somehow interact with .NET differently then IE8? So far I've only been able to test it on the two machines.
2) Is there any way to force IE to reload the .dll from the server? I've tried everything I know (F5, Ctrl-F5, Ctrl-Refresh Button, Alt-D Enter, etc.), but it seems like IE randomly loads different versions of the .dll. Closing IE and restarting usually gets it to load the latest version, but that's not very convenient when making mods and testing them.
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Jun 21, 2012
when i'm on a page, the gridview paging was selected to 2,3, or higher..
the problem is when i reload the page, it goes back to 1 again.. is there any solution to set the selected in gridview paging on every page load?
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