C# - Reload A Dropdown On Postback?

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?

View 1 Replies


Similar Messages:

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?

View 5 Replies

AJAX :: Cascading DropDown Reload On Post Back?

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.

View 3 Replies

Reload The Viewstate Of Usercontrols During Postback?

Aug 27, 2010

Is it necessary to reload the viewstate of usercontrols during postback? I want to know in which case viewstate is set by default.

View 2 Replies

C# - How To Force A Control To Reload The Postback Data

Jan 25, 2011

What is the best practice to force the postback Data and ViewState data to be re-loaded on the code behind?

The reason I ask this is, i have one gridview which is generated dynamically and I when it is structure is generated the postback data is already loaded and I want to forse asp.net to reload the postback data once I have my gridView structure is generated.

How can I achieve this?

View 1 Replies

Google Chrome To Full Page Reload On Postback?

Sep 27, 2010

I am creating one of my first Asp.Net tools and I ran in to a small bump. Currently I am doing a postback on a buttonclick which does some server-side calculations. The server-side code then uses those calculations to alter the contents of a div. In IE and Firefox when a postback happens, the div updates as expected. However, in chrome all postbacks do a complete refresh of the entire page. What is causing this and is there a way around this behavior?

Update:
ClientSide I have the following..
<asp:Button ID="Button2" Style="float: right" runat="server"
OnClick="S_ButtonClick" Text="Calculate" />

Which calls a method summarized as so.

protected void S_ButtonClick(object sender, EventArgs e)
{
//Code parsing values from textboxes ect.
//Do Some Calculations
//Output Results
outputDiv.InnerHtml = "<h2>Foo</h2><br/>";
outputDiv.InnerHtml += "Bar: " + calcValue;
}

It is possible that when this postback(if I understand this correctly) happens, that it is still fully reloading in firefox and ie, but it doesn't show it. This effectively masks the postback. However, when I test in chrome, any postback completely blanks the page before reloading the state. Hopefully this clears up exactly what I am asking. Also, my C#/.Net usage might be slightly flawed and I am willing to take comments on such.

View 1 Replies

Web Forms :: How To Detect Page Refresh Or Reload Apart From Postback

Oct 23, 2013

I just want to know how to detect a page is refreshed or reloaded apart from Postback. Just clicking the reload button in the browser...

View 1 Replies

Keep The Values In Dropdown After A Postback?

Oct 29, 2010

How can I keep the values in dropdown after a postback? I have this code:

[Code]....

The dropdonws is set to autopostback. How can i bind the dropdowns in a better way then I do now? When I post back the dropdowns are set to default value.

View 2 Replies

JQuery :: How To Prevent Postback For Dropdown

Feb 8, 2011

In dropdown when i select value(not text) "0" it should not go for postback,

to do this i am using e.preventDefault();

if i select other than "0" it has to go postback.

but,it is always going for postback ,the e.preventDefault(); is not working.

How can i achieve this in jquery?

return false; is also not working.

i am sure that i am selecting the value "0", i checked it by using alert();

View 3 Replies

Cascading Dropdown Empty After Postback?

Sep 15, 2010

A form contains 2 cascading dropdowns. When an item is selected in the first dropdown, jQuery retrieves a list (json) from the server and fills the 2nd dropdown.

The user posts the page to the server, and when the page is returned the dropdown is empty because its not stored in viewstate.

What do you do in this situation? Is this the point where cascading dropdowns using jQuery and trying to make your page a little more stateless gets tedious?

View 1 Replies

Dropdown Looses Its Content After A Postback

Jun 19, 2014

I have a dropdown that is populated from the database on my page_load event, however, the drop down looses its content after a postback.

View 4 Replies

Print Selected Value From Dropdown On Web Page After Postback?

Dec 11, 2010

I want to print the selected value from dropdown on web paage after postback (On select value) , (I have tried this but as i on postback its value dont change after selecting different value),,,, and also is thr any url that will provide chat on asp.net instead of forum as it takes long time for reply ......

[Code]....

View 11 Replies

How To Change Dropdown Listbox And Auto-postback To True

Oct 27, 2010

I have a dropdown listbox whose datasource is a dictionary.

When I have added items to the list and try to select an item from the list, the item I selected does not get the focus. And this comes when I changed the property autopostback to true.

Here are some of the codes which are relevant to it.

[code]....

View 1 Replies

AJAX :: Avoid Postback In Multiple Dropdown List

Oct 9, 2010

i have 4 dropdownlist..state,district,place,product..where we have to select the product depend on state ,district ,place and product and there is search button for search particular product where iam using gridview to dipslay particular product deatails. i do not want to do auto past back eventfor page when i select dropdownlist...i tried using ajax but still i cant get through..i tried this code. how to use ajax for 4 dropdownlist & 1 button so that i can dispaly product deatails.

View 3 Replies

Web Forms :: Stop Postback If Selected Value In Dropdown List = No

Oct 14, 2010

I want to stop postback if a certain value from a ddl is selected.

I've used VB to create a page whereby if a certain value from a ddl is selected then a hidden panel becomes visible. The problem is the likely answer to a majority of my ddl's is 'No' (or a no type response), however, even though the panel visibility remains false upon selecting No a postback still occurrs, the page refreshes and moves back to the top. I suppose this is a question with 2 possible solutions (or 2 questions rather)

1: Is there anyway of setting postback to false if selected value = No? A typical example of how my code appears is below

[Code]....

(i've used the value '1' to represenet Yes)

2: Is there a way of setting the page position after postback? As you can see in my code above i've set the focus on the next control (being a Radio Button) but i mean, is there an actual way of defining where the scroll bar is set?

View 6 Replies

AJAX :: Cascading Dropdown Clearing Knowncategoryvalues On Postback

May 4, 2010

I have 3 Cascading dropdowns in a user control. After making a selection i want to clear the values of the selections or make it to select some values that I pass in. The ownCategoryValues does not get reset and everytime the service gets called the knowncategory values is the same.At what point should the knowncategoryvalues be changed to reset the dropdowns

View 1 Replies

DropDown List (in Update Panel) Causing FULL PostBack?

Jan 26, 2010

I'm using the same thing on different page and it works fine in there, but on this specific page, this is not working.

Here's what I have:

<asp:UpdatePanel ID="upMain" runat="server" UpdateMode="Conditional" Visible="true" RenderMode="Inline">
<ContentTemplate>
<asp:DropDownList ID="ddlNewService_PortTelco" runat="server" Width="250" CssClass="dropdown" AutoPostBack="true" OnSelectedIndexChanged="Provision_PortedTelcoChanged"></asp:DropDownList>
</ContentTemplate>
</asp:UpdatePanel>

On the way before the DropDown there is one DIV (html one), and then few asp:Panels.

View 3 Replies

Web Forms :: Avoid Postback Operation For Dropdown On Selected Index Changing?

Jun 4, 2010

I created my page with asp dropdown. On selected index changed I am seeing postback operation on dropdown. I couldn't avoid postback operation of asp dropdown with updatepanel also.

IS there a another way to avoid dropdownpostback operation.

[Code]....

</contenttemplate>
</asp:updatepanel>

View 10 Replies

AJAX :: Invalid Postback Or Callback Argument (using Cascading Dropdown List Controls)

Oct 12, 2010

i use cascading dropdown lists (in a user registration form) and when the user hits the submit button i get the error: "Invalid postback or callback argument" I've seen on the net that this is a problem dating back many years but still haven't found a solution to this. I've read about changing EnableEventValidation to false, but this poses a security risk.

View 2 Replies

Data Controls :: Dropdown Selection Creates Additional Gridview On Auto-postback

Sep 20, 2015

When I select the Search By dropdown, an additional gridview is created on auto-postback.I will ad a visual and code as soon as this is accepted for review.

View 1 Replies

AJAX :: Autopostback On The Last List In A Cascading Dropdown List Series/ Invalid Postback Or Callback Argument

Aug 20, 2010

I have a Cascading drop down list that is working fine to load the correct lists however I would like to have the last one initiate a query and display a datagrid on the same page containing the results of the query. Without Ajax involved this seems rather easy by using autopostback on the drop downs. If I could do it through Ajax that would be great but I can settle with having the page to reload to display the data. Right now I'm not sure how to do either. I enabled autopostback on the last drop down and wrote a method for it but I get an error at runtime saying:

Invalid postback or callback argument

View 4 Replies

Avoid Reload Window In Xml?

Aug 19, 2010

i need a information of how to avoid the reload source editor window for after xml file save using Asp.net

View 1 Replies

How To Download File And Reload

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]....

View 1 Replies

MVC 2 Use Ajax To Reload A UserControl?

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?

View 2 Replies

C# - Reload Xml File If Change?

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)

View 5 Replies







Copyrights 2005-15 www.BigResource.com, All rights reserved