Set textbox value from database by selecting cascading dropdown with out postback

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Is there any possibility to set textbox value from database based on selecting ajax cascading drop down without auto postback?if possible how?

Posted 29-Oct-15 21:21pm

User-11630313

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Sinisa Hajnal 30-Oct-15 3:29am

If you don't want to go to server, you have to have the value you need (based on the dropdown) somewhere on the page. Either add it to the dropdown itself or have a bag of values on the page and select based on that.

Otherwise, you have to take the dropdown value and do another ajax call. By definition, ajax calls are NOT postbacks :) Good luck

2 solutions

Solution 1

yes, use

<asp:updatepanel id="UpdatePanel1" runat="server" xmlns:asp="#unknown">
<contenttemplate>
<asp:textbox id="txtID" runat="server">

<triggers> <asp:asyncpostbacktrigger controlid="yourdropdownlistid" eventname="SelectedIndexChanged">

in code behind

protected void yourdropdownlistid_SelectedIndexChanged(object sender, EventArgs e)
{
//get Data from database and assign the value to textbox
}

Posted 29-Oct-15 21:29pm

Maddy Mc

Comments

User-11630313 30-Oct-15 3:41am

hi..thanks for replay...i tried what your posted but some errors occured like
Error 3type 'System.Web.UI.UpdatePanel' does not have a public property named 'TextBox' and

Maddy Mc 30-Oct-15 3:45am

can i see you code segment

User-11630313 30-Oct-15 3:47am

<tr> <td class="caption">
Chit Period Code:
<asp:DropDownList ID="ddlPeriodCode" runat="server" CssClass="userentry">
<cc1:CascadingDropDown ID="cdlChitPeriod" TargetControlID="ddlPeriodCode" PromptText="Select Chit Period"
ServicePath="~/CasCadingDropDown.asmx" ServiceMethod="GetChitPeriodCode" runat="server"
Category="PrdCode" LoadingText="Loading..." UseContextKey="true" />
</td></tr>
<tr>

<td class="caption">
Maximum Discount:
<asp:updatepanel id="UpdatePanel1" runat="server">
<asp:TextBox ID="txtMaxDiscount" runat="server" CssClass="userentry">
<asp:asyncpostbacktrigger controlid="ddlPeriodCode" eventname="ddlPeriodCode_SelectedIndexChanged" />

</td>
</tr>

Maddy Mc 30-Oct-15 3:52am

ur using TagPrefix="cc1" so change <asp:updatepanel id="UpdatePanel1" runat="server"> to <cc1:updatepanel id="UpdatePanel1" runat="server">

Maddy Mc 30-Oct-15 3:54am

<cc1:UpdatePanel ID="UpdatePanel1" runat="server">
<contenttemplate>
<asp:TextBox ID="txtMaxDiscount" runat="server" CssClass="userentry">

<Triggers>
<asp:AsyncPostBackTrigger ControlID="ddlMutationType" EventName="SelectedIndexChanged" />
</Triggers>

User-11630313 30-Oct-15 3:55am

here "cc1" is AjaxControlToolkit tagprefix...

Maddy Mc 30-Oct-15 3:57am

UpdatePanel also AjaxControlToolKit control

User-11630313 30-Oct-15 4:13am

hmmm..but in my cc1 propertys does not show updatepanel

Maddy Mc 30-Oct-15 4:48am

then use asp updatepanel only

User-11630313 30-Oct-15 5:01am

thankyou for your patince...i used it but run time error genarating
System.InvalidOperationException: Could not find an event named 'ddlPeriodCode_SelectedIndexChanged' on associated control 'ddlPeriodCode' for the trigger in UpdatePanel 'UpdatePanel1'.

Maddy Mc 30-Oct-15 5:06am

that means in ur code behind you dont have
protected void ddlPeriodCode_SelectedIndexChanged_SelectedIndexChanged(object sender, EventArgs e)
{
//get Data from database and assign the value to textbox
}

method

User-11630313 30-Oct-15 5:23am

no man i had it in my code behind...

Maddy Mc 30-Oct-15 5:40am

<asp:DropDownList ID="ddlPeriodCode" runat="server" CssClass="userentry"
onselectedindexchanged="ddlPeriodCode_SelectedIndexChanged" AutoPostBack="True">

User-11630313 30-Oct-15 5:46am

still...the error logged like
2015-10-30 15:20:29,107
Global [(null)]
>> /CTAS/Web.UI/master/syschitregistrationdetails.aspx?at=n&sm=12
System.InvalidOperationException: Could not find an event named 'ddlPeriodCode_SelectedIndexChanged' on associated control 'ddlPeriodCode' for the trigger in UpdatePanel 'UpdatePanel1'.
at System.Web.UI.AsyncPostBackTrigger.Initialize()
at System.Web.UI.UpdatePanelTriggerCollection.Initialize()
at System.Web.UI.UpdatePanel.Initialize()
at System.Web.UI.UpdatePanel.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Maddy Mc 30-Oct-15 5:50am

can i see ur code behind

User-11630313 30-Oct-15 5:54am

hey its working..just small change like
<asp:AsyncPostBackTrigger ControlID="ddlPeriodCode" EventName="SelectedIndexChanged" />

Maddy Mc 30-Oct-15 5:55am

Good Luck

User-11630313 30-Oct-15 5:56am

thankyou so much....Maddy Mc

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Maddy Mc · Accepted Answer · 2015-10-29T21:55:00

XML

<cc1:UpdatePanel ID="UpdatePanel1" runat="server">
                            <ContentTemplate>
                                <asp:TextBox ID="txtMaxDiscount" runat="server" CssClass="userentry"></asp:TextBox>
                            </ContentTemplate>
                            <Triggers>
                                <asp:AsyncPostBackTrigger ControlID="ddlMutationType" EventName="SelectedIndexChanged" />
                            </Triggers>
                        </cc1:UpdatePanel>