Passing Text of a text box in child form to a label in parent form

Hi Elite People !!

I have a parent form with a number of ASP Labels and Buttons. Each ASP Label has a ASP Button next to it. What I want to acheive is when you click the button, it should open a new window with a ASP multiline text box and a "save" button. User can enter the text in the text box and when they click the SAve button, the Text in the text box of the Child window should be displayed in the label on the parent form.

 I am successfully able to do this when I have a Text Box in the Parent form, but my requirement is to use Labels on the Parent Form. I am also using a Master page on the parent form.

And as I have multiple Labels on the Parent form, is there a way to acheive this with creating just one child window or I will have to create multiple child windows for each Label in the parent as text for each label is going to be different.

 How can I acheive this ??

 I would really appreciate the help.


9/10/2008 8:24:32 PM 24353 articles. 2 followers. Follow

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One solution:

-Create a single popup form with a TextBox and a Save / Close button. e.g. "TextForm.aspx"
-Accept a query string parameter (or a POST argument) that specifies which field this form is operating on
-In your parent form (with Labels) script your buttons to load this window:


 in this example we will be using this to update a field called "AboutMe" you could also include a table param e.g. Table=UserProfile, etc. If security is a concen you may want to encode this data to stop scripting hacks.

-In TextForm.aspx write some code to write the value of the TextBox to the correct field / table when the Save button is pressed.
-If you do this with a postback then get the form to execute a block of script after the postback. If you do this with a call back chain the following script after the callback has completed.
-Write a script block for TextForm.aspx that calls a function in the parent (opening) window. I believe the handle can be obtained using window.opener from the child window but you'll have to look this up. After you have called the function close the popup with window.close();
-In the parent (Label) form write the script function that is to be called. This function will cause the parent form to update the label. You can either do this with a callback or you can just force the page to do a postback, it's up to you.


9/11/2008 8:53:39 AM


   Is it an Ajax Enabled WebSite?

9/11/2008 9:05:13 AM


In this scenario I think one Child window is enough and just you need to pass the Label control Id for which it is updating the text.

For ex:Parent Form should like this ...

<form id="form1" runat="server">


<asp:Label ID="Label1" runat="server" Text="Label" ></asp:Label>&nbsp;

<asp:Button ID="Button1" runat="server" Text="Open" OnClientClick="return OpenChildWindow('Label1');return false;" /> <br />

<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>&nbsp;

<asp:Button ID="Button2" runat="server" Text="Open" OnClientClick="return OpenChildWindow('Label2');return false;" /> <br />

<asp:Label ID="Label3" runat="server" Text="Label"></asp:Label>&nbsp;

<asp:Button ID="Button3" runat="server" Text="Open" OnClientClick="return OpenChildWindow('Label3');return false;" /> <br />

<input type="hidden" runat="server" id="hidTxt1" />



function OpenChildWindow(sender)


var vUrl="Child.aspx?Id="+sender;;

return false;


and Child Page

<form id="form1" runat="server" defaultfocus="txtChild">


<asp:TextBox ID="txtChild" runat="server" TextMode="MultiLine" Rows="3" ></asp:TextBox><br />

<asp:Button ID="btnSave" Text="Save" runat="server" OnClientClick="return CloseWindow();return false" />



function CloseWindow()


var sLabelID='<%=strId %>';

var sNewLabelText=null;







return false;


Code Behind in Child page

public static string strId = "";
protected void Page_Load(object sender, EventArgs e)



strId = (this.Request.QueryString["Id"] != null) ? (this.Request.QueryString["Id"].ToString()) : String.Empty;


Note:Here we are set the Label Text from client side ,so it does not maintain the view state i.e. In code behind this Label Text value may be null.

If you need this also ,better use some hidden fields and and assign those values to these hidden fields and access them

If I have misunderstood your problem ,Please letus know.



9/11/2008 9:58:03 AM

Thanks a Ton Satish.... You really made my day... your suggestion works like a champ. I have one more question though.

 In the multiline text box that I have on the child form, if a user writes the text in paragraphs (i.e. the user hits Enter to change the paragraph or to start a new line), is there is way to have the same effect back on the label on the parent form?? (i.e. the text in the label on the parent form should also display with the paragraphs)

Eagerly waiting for your response.


9/12/2008 1:35:54 AM

You can use the <br> element in a Label control to create a line break.



9/12/2008 1:47:42 AM

Hi Satish

Well I spoke too early Sad while your suggested code works well when I am not using a Master Page. But it does not work on my website where I am using Master pages on the parent form.

in my website with the master page, it opens the child window just fine. but when I enter the text in the text box and click save, nothing happens. I don't even get any error. I am truly baffeled. 

and I am still struggling with keeping the paragraphs intact on the label on the parent form.

Any ideas ??


9/12/2008 1:54:54 AM

Set the OnClientClick in the Page_Load handler of the CodeBehind instead of in the markup:

<asp:Button ID="Button1" runat="server" Text="Open" />

Button1.OnClientClick = string.Format("return OpenChildWindow('{0}'); return false;", Label1.ClientID);

For line breaks in the Label, use <br> tags. 


9/12/2008 2:06:47 AM

Thanks a Ton NC...

That took care of the issue. Can you please explain how I can use the <br> tags in the label. Where in the code can I replace the Carriage in the text box on the child form with a <br/> tag on the label on the parent form ??

I apologize if it is too silly to ask

9/12/2008 2:35:17 AM

var sNewLabelText = document.getElementById('txtChild').value;
while ( true )
 var currentValue = sNewLabelText;

 if ( sNewLabelText.indexOf('\r\n') > 0 )
  sNewLabelText = sNewLabelText.replace('\r\n', '<br>');
  sNewLabelText = sNewLabelText.replace('\n', '<br>');

 if ( sNewLabelText == currentValue )

I couldn't easily figure out a RegEx expression to remove either "\r\n" or "\n", so I came up with that loop to replace all with the <br> tag. Maybe someone else can.


9/12/2008 2:25:26 PM

Dear NC,

 You truly rock ! Both of your suggestions work like a charm

All of you guys are truly awesome !!

9/13/2008 12:43:57 AM

Just remember that if the page containing the Label does a PostBack, all changes to the Label will be lost since client-side changes to a Label are not persisted in ViewState. To get around this, replace those Labels with:

<asp:TextBox id="labelTextBox" BorderColor="White" BorderStyle="None" BorderWidth="0" runat="server"></asp:TextBox>

<script type="text/javascript">
// We need to set the ReadOnly property here, as in version 2.0,
// setting it in the markup does not persist client-side changes.
window.onload = function ()
 document.getElementById('<%= labelTextBox.ClientID %>').readOnly = true;
// -->



9/13/2008 2:00:55 PM

thanks for your valuable suggestions NC,

I indeed got in to the trouble that you explained. I have changed the labels on my parent forms to text box, but now I can't replace the carriage return in the text box on the child form with a new line in the text box on the parent form.

Any ideas ?? I am in desparate need to get this working. 


9/19/2008 2:39:05 AM

Change the element declaration in the parent page to:
<asp:TextBox id="labelTextBox" BorderColor="White" BorderStyle="None" BorderWidth="0" runat="server" TextMode="MultiLine"></asp:TextBox>

Add this JavaScript to the parent page:
<script type="text/javascript">
function windowOnLoad()
 document.getElementById('<%= labelTextBox.ClientID %>').readOnly = true;
 document.getElementById('<%= labelTextBox.ClientID %>').style.overflow = 'hidden';  // Removes the scrollbars
window.onload = windowOnLoad;
// -->

And in the child page remove the string replace, just:
window.opener.document.getElementById('<%= Request["ID"] %>').value = '1\r\n2\r\n';
 // document.getElementById('txtChild').value;


9/19/2008 2:16:33 PM

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