Intersoft Community - postback

Regarding Loading Dependency WebCombo with MultipleSelectionSettings Enabled="True" Without Postback

sphinxg@usa.net — Tue, 25 Apr 2017 16:14:55 GMT

Hi,

We are using Web Combo version 6.

We are using multiple WebCombo's with

MultipleSelectionSettings Enabled="True"

Based on first WebCombo the second should be filled.

And based on the selected values in the first and second WebCombo the third WebCombo needs to be filled.

Kindly let us know on achieving the same without Postback.

Webcombo behaviour to stop fires AutoPostback

sjain — Tue, 10 Nov 2015 15:33:29 GMT

Hi,

I have webcombo on page, when we click on webcombo menu(marked as blue round in attached picture) to

load the data then it fiers the postback event to server side.

which I DON'T want. I want to stop this behaviour.

Please give me solution when we click on webcombo menu then it should not fire sever side page_load event.

Regards

Sachin Jain

WebListBox cant detect Selected item is this a bug?

neil.turner@ntd.co.uk — Mon, 06 Jun 2011 06:57:41 GMT

I'm trying to get the selected item of a WebListBox on post back so i can add one item in a weblistbox to another WebListBox but the selected item isn't being detected selected when the button is clicked

Code below

<td>

<ISWebEssentials:WebListBox ID="WebListBox1" runat="server" Height="160px"

Width="250px" >

<Items>

<ISWebEssentials:WebListBoxItem Name="WebListBoxItem0" Text="1" />

<ISWebEssentials:WebListBoxItem Name="WebListBoxItem1" Text="2" />

<ISWebEssentials:WebListBoxItem Name="WebListBoxItem2" Text="3" />

<ISWebEssentials:WebListBoxItem Name="WebListBoxItem3" Text="4" ToolTip="4" />

</Items>

</ItemStyle>

</ISWebEssentials:WebListBox></td>

<asp:Button ID="Button1" runat="server" Text="Add" ToolTip="Add item" onclick="btnAddItem_Click" /><br /><br />

</td>

<td>

<ISWebEssentials:WebListBox ID="WebListBox2" runat="server" Height="160px" Width="250px">

<Items>

<ISWebEssentials:WebListBoxItem Name="WebListBoxItem0" Text="a" />

</Items>

</ISWebEssentials:WebListBox></td>

</tr>

</table>

Code behind

protected void btnAddItem_Click(object sender, EventArgs e)

{

foreach (WebListBoxItem wli in WebListBox1.Items)

{

if (wli.Selected)

{

WebListBox2.Items.Add(wli);

}

How to avoid XML in WebGrid's AJAX postback?

Eric — Thu, 25 Nov 2010 11:24:49 GMT

Hi,

We use the latest version of WebGrid 6.

In our server infrastructure there are some servers in front of our IIS. These servers do input validation to prevent cross site scripting attacks. I have no control on what is filtered there, but I received a blocking log.

The problem is that anything that looks like XML will be blocked. A string like:

" abc = … >

anywhere in a POST data field will be blocked. And I found a blocked (AJAX?) POST request, looking like it came from WebGrid.

Interestingly our application works - including all WebGrid functionality. But we do see some problems.

Questions:

Does your WebGrid support such industry-standard high security environments in general?
Is there a way to avoid XML data in POST fields?
Is there a known bug in data encoding?
Do these AJAX postbacks have a special HTTP header field that could be used to distinguish if this is a special postback and not a standard form post? If yes, maybe the input validation can be disabled (or relaxed) for such requests.

It would be great if you could answer these four questions.

Regards,

Eric

Unbound WebGrid example wanted / Help on common design

Eric — Mon, 07 Jun 2010 12:13:20 GMT

Hi, I have a screen with lots of controls and one list of items. This item list is shown in a WebGrid. I have two buttons to add and remove items into/from that list. When adding, another modal dialog pops up to select the correct item. When deleting, this is done by a checkbox column in the grid. And there's a save button on the form to save all data together back to the database. When a new row gets added to the WebGrid, this may not be saved to the database at that time, only later, if the user clicks on Save.

I had to make bigger changes of this existing (working) page, because of bad design. Actually I almost had to rewrite it.

In Page.Load I read in all data from the database (including the list of items) and store this in a local structure. I do not want to use session variables. Storing data in ViewState would be ok.

What is the correct way of implementing something like this? It seems to be a standard problem. Is there a demo for this available somewhere? Should I make the WebGrid somehow unbound?

In Page.Load I read in the data. And in grid.InitializeDataSource I set the e.DataSource to the values from what I read in Page.Load earlier (by creating a table and assigning it). On Postback, I cannot read in the data again, because this would overwrite the current data. So after a Postback, the internal variable doesn't contain any data anymore. When clicking on Save, I save all fields back to the database. Is this design correct so far?

But how would I implement the insert/delete of the rows to the WebGrid? For the Add button (<asp:Button>) I have an attribute like this: OnClientClick="ModalDialog(...

In the click handler on the server side I read the ID of the selected item from a session variable (still bad design, but unchanged), which was set in the selection dialog, then get some more info from the DB and I think then I should add this data as a row to the WebGrid. Is that correct? How would I add this row? In the Button click event adding a row to the grid.RootTable? And even if this would work, how should I afterwards refresh the grid?

Please help getting this designed correct with your control. We are using WebGrid version 6.0.7200.218. An example would be even better. But just help on the design is also ok. I think because this is a common problem, maybe there is already an example somewhere.

Thanks