Problem of text box reset

[Crazyec]

Dear Pros,
I have created a control page(.ascx) which has a drop down list box, two text boxes with a search button. The two text boxes are readonly which should be enter the date by a pop-up calendar.
User should select from the drop down list and the text boxes(date range) and click the search button. The grid view will refresh by the selected data.
(That's why I need to set the text boxes to be readonly in order to ensure the format of the date, to avoid the overflow error of the query)

After I enter the date range , choose the drop down list and click the search button, the date range text boxes are all reset to nothing while the drop down list still keep my selection. (My grid view is refresh without data too)

I think that is the problem of page_load that it create the text boxes again? but why the drop down list will not happen the same problem?

following is the code:
HTML:

Sub Page_Load(Sender As Object, E as EventArgs)
hlStartDate.NavigateUrl = "JavascriptickDate('" & txtStartDate.ClientID & "')"
hlEndDate.NavigateUrl = "JavascriptickDate('" & txtEndDate.ClientID & "')"
End Sub



Code:

<table>
<tbody>
<tr><td>
<asp:Label id="lblDate" runat="server" forecolor="Black" text="Date">Date:</asp:Label>&nbsp;
</td>
<td>
&nbsp;
<asp:HyperLink id="hlStartDate" runat="server" ImageUrl="Images\date-picker.gif"></asp:HyperLink>
&nbsp;
<asp:TextBox id="txtStartDate" runat="server" readonly="true" AutoPostBack="false"></asp:TextBox>
</td>
<td>
<asp:Label id="lblTo" runat="server" forecolor="Black" text="To">To</asp:Label>&nbsp;
</td>
<td>
&nbsp;
<asp:HyperLink id="hlEndDate" tabIndex="1" runat="server" ImageUrl="Images\date-picker.gif"></asp:HyperLink>
<asp:TextBox id="txtEndDate" runat="server" readonly="true" AutoPostBack="false"></asp:TextBox>
&nbsp;
<asp:button id="cmdSearch" tabIndex="3" runat="server" Text="Search"></asp:button>
<asp:Label id="label1" runat="server" forecolor="Black" text="label1">To</asp:Label>&nbsp; </td></tr> <tr><td>
<asp:Label id="lblUserID" runat="server" forecolor="Black" text="User ID">User ID:</asp:Label>&nbsp;
</td>
<td colspan="3">
&nbsp;
<asp:SqlDataSource id="UserDataSource" SelectCommand="SELECT * FROM tbl_user Order By user_ID" ConnectionString="<%$ ConnectionStrings:server1 %>" ProviderName="System.Data.SqlClient" Runat="server"></asp:SqlDataSource>
<aspropDownList id="UserList" tabIndex="2" runat="server" AutoPostBack="False" DataValueField="User_ID" DataTextField="User_Name" DataSourceID="UserDataSource"></aspropDownList>
</td></tr>
</tbody>
</table>

 

[jbenson001]

How are you populating the textboxes? Are you using javacript to write the values to them? If you are, I don't believe the values will be written to the viewstate, and that is why they are coming up blank on the post back.
If this is the case, you could always store the values to hidden fields on the form, and use those to repopulate the textboxes.


Jim

 

[Crazyec]

yes, I use javascript to write the value to them. But I see the values entered to the textboxes already.
And the point I don't understand is, when I change the readonly to be false, the text boxes will not reset to nothing.

 

[jbenson001]

when I change the readonly to be false, the text boxes will not reset to nothing.

Not sure what that means ...

When you change to readonly do you want to retain the values? Are you saying they are reset when you change the readonly property?

Jim

 

[Crazyec]

I change the readonly property to False. The textboxes are not reset after I press search button.

I want to retain the values after press search button.

 

[Crazyec]

Hi Jim,
may I know how to store the values to hidden fields on the form, and use those to repopulate the textboxes?

 

[Crazyec]

I think my case is something like this.
[URL unfurl="true"]http://www.tek-tips.com/viewthread.cfm?qid=1150658&page=45[/url]

but it still hasn't solution yet.

 

[jbenson001]

Here is an example of reading and writing to hidden fields on a form:

http://www.quirksmode.org/js/forms.html

Scroll down to the section named :
Texts, textareas and hidden fields

 

[Crazyec]

Thank you, Jim.

 

[jbenson001]

Glad to help hope it works out for you...