Pass Value From Parent Form to Child Form using javascript showModalDialog

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if i want to pass in my value for confirmation box!!! so lets say i want to delete item no 1 so i checked the check box then when i pressed the delete button. the popup box come

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谎友^

2021-02-10 16:06

Suppose we have the WindowTrigger.aspx which contains a button as shown below and which invokes the following script and executes and which opens the new page WindowContainer.aspx using showModalDialog.

     <asp:Button ID="btnDate" Text="Display Window" OnClientClick="WindowOpen()"       runat="server" />

<script language="javascript" type="text/javascript">
         function WindowOpen() {
             var theAdmin = new Array();
             theAdmin["id"] = '';
             theAdmin["name"] = '';
             var winopts = "dialogWidth:290px;dialogHeight:220px;scroll:no;resizable:no;status:no;unadorned:yes";

             var admStatus = window.showModalDialog("http://localhost:51836/WindowContainer.aspx", theAdmin, winopts);
             alert(theAdmin["id"]);
             alert(theAdmin["name"]);
         }
     </script>

The above script contains the array declaration 'theAdmin' which is passed to Child window using 2nd argument as shown

The following code is in WindowContainer.aspx which contains a listbox and a button,on click of the button the argument will get intialized to corresponding selected Texts and selected Values of the listbox.

    <asp:ListBox ID="ddlUsers" runat="server" Rows="10" SelectionMode="Multiple">
       <asp:ListItem Text="Chennai" Value="044"></asp:ListItem>
       <asp:ListItem Text="Hyderabad" Value="040"></asp:ListItem>
       </asp:ListBox> 
   <asp:Button ID="btnDate" Text="Date" OnClientClick="submitForm()"  runat="server" />  

<script language="javascript" type="text/javascript">
         function submitForm() {
             var lstAdmins = document.getElementById('ddlUsers');
             var SelectedIDs = "";
             var SelectedNames = "";
                 if (lstAdmins != null) {
                     for (i = 0; i < lstAdmins.options.length; i++) {
                         if (lstAdmins.options[i].selected) {
                             if (SelectedIDs == '')
                                 SelectedIDs = lstAdmins.options[i].value;
                             else
                                 SelectedIDs += ";" + lstAdmins.options[i].value;

                             if (SelectedNames == '')
                                 SelectedNames = lstAdmins.options[i].text;
                             else
                                 SelectedNames += ";" + lstAdmins.options[i].text;
                         }
                     }
                 }
             var theAdmin = dialogArguments;
             theAdmin["id"] = SelectedIDs;
             theAdmin["name"] = SelectedNames;
             window.returnValue = "OK";
             self.close();
         }

     </script>

Now the output will be "044;040;" and "Chennai;Hyderabad;" respectively.In this way we can pass values(here theAdmin) from parent form to child form,and the result can also be used in parent form(there is no lose of scope to the parameter).

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闹比i

2021-02-10 16:15
If you are using a popup window you can reference the parent like this:
```
window.opener.document.getElementById("whatever").value = whatever;
```
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忘掉有多难

2021-02-10 16:23
The middle parameter for showModalDialog can be an object or an array or anything you like, and this passed object can be retrieved in the child form (say, in its OnLoad event) by referencing window.dialogArguments.

Hang on a second and I'll include a code sample (it's been about 10 years since I've done this).

Update: here is a very simple code sample that shows the basics of passing data back and forth between the parent and child windows using showModalDialog. Create two HTML files in the same folder, and name them "Parent.htm" and "Child.htm". Put this code in Parent.htm:
```
<HTML>
<input type=button value="CustomConfirm" 
    onclick="ShowMyDialog()">
<script language="javascript">
function ShowMyDialog()
{
    var obj = new Object(); 
    obj.data1 = 'some data 1';
    obj.data2 = 'some data 2';
    showModalDialog('Child.htm', obj, '');
    alert(obj.returnvalue);
}
</script>
</HTML>
```
and put this code in Child.htm:
```
<HTML>
<body onload="ReadPassedData()" 
    onunload="DoUnload()">
<input type=text id="textbox1">
<br>
<input type=text id="textbox2">
<br>
<br>
Return value:<br>
<input type=text id="textbox3" 
    value="type something">
</body>
<script language="javascript">
function ReadPassedData()
{
    var obj = window.dialogArguments;
    var tb1 = document.getElementById('textbox1');
    tb1.value = obj.data1; 
    var tb2 = document.getElementById('textbox2');
    tb2.value = obj.data2; 
}
function DoUnload()
{
    var obj = window.dialogArguments;
    obj.returnvalue = textbox3.value;
}
</script>
</HTML>
```
Then open Parent.htm in a browser and click the "CustomConfirm" button. The child window will display the values set in the parent window ("some data 1" and "some data 2"), and when the child window is closed, whatever you've entered in the third text box will be displayed in an alert box called from the parent. This shows the basic way in which you pass data to the child and get data back from it.

There's also a way to return an object from the child window (which becomes the value returned from the showModalDialog call itself), but I don't recall how to do this.

Update 2: To pass an array instead, you would do something like this:
```
var myarray = new Array();
myarray[0] = "Bob Smith";
myarray[1] = "Doug Jones";
myarray[2] = "Englebert Humperdinck";
var ret = showModalDialog('Child.htm', myarray, '');
alert(ret); // this will display whatever the child set for its
    // window.returnValue
```
And then in the child window, you would get the array like before and use it to build your details display:
```
var myarray = window.dialogArguments;
alert(myarray[0]); // or whatever
```
Since you're now passing in an array instead of an object, you'll need to return true or false (instead of adding a returnvalue property to the passed object). You set the return value in the child by setting the window.returnValue property. Since you're creating a confirmation popup, you would presumably have a "Yes" and a "Cancel" button which would set window.returnValue to true or false, respectively.
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