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client side handling of selectedIndexCh anged from an asp.net dropdownlist

34 New Member
If the user of my site changes their selection in a dropdownlist, I would like to handle that client side and based on what they chose it would populate a text box with different text.

I can figure out how to do this server side no problem, but how do I get to do this in javascript.

I have something like:

<asp:DropDownLi st ID="StatusDropD ownList" runat="server" >
<asp:ListItem Selected="True" Text="Released" Value="Released ">Released</asp:ListItem>
<asp:ListItem Text="Down" Value="Down">Do wn</asp:ListItem>
<asp:ListItem Text="Blocked" Value="Blocked" >Blocked</asp:ListItem>

</asp:DropDownLis t>

I have an text box that I want to populate based on what the user selects and I would like to do this in javascript...I cannot seem to get that function to work.

any suggestions?
thanks.
Aug 7 '07 #1
15 27769
Frinavale
9,735 Recognized Expert Moderator Expert
If the user of my site changes their selection in a dropdownlist, I would like to handle that client side and based on what they chose it would populate a text box with different text.

I can figure out how to do this server side no problem, but how do I get to do this in javascript.

I have something like:

<asp:DropDownLi st ID="StatusDropD ownList" runat="server" >
<asp:ListItem Selected="True" Text="Released" Value="Released ">Released</asp:ListItem>
<asp:ListItem Text="Down" Value="Down">Do wn</asp:ListItem>
<asp:ListItem Text="Blocked" Value="Blocked" >Blocked</asp:ListItem>

</asp:DropDownLis t>

I have an text box that I want to populate based on what the user selects and I would like to do this in javascript...I cannot seem to get that function to work.

any suggestions?
thanks.
Are you sure you want to use JavaScript instead of Server Side code to populate the TextBox?

There is a way to do it using JavaScript but it'd be easier to do with Server Side code....

You'd have to write a JavaScript that handles the onblur event for the DropDownList (which is an HTML <select> list) that takes the selected value and sets the TextBox's text (set the "value" property of the <input type="text"> element that is your TextBox)

If you really want to do this....I'd start my research on the w3c website...it has good examples and I have found it to be the best resource for JavaScript problems.

Also, you could check out the .NET article on How to check if a textbox contains a number for an example of how to use JavaScript in .NET.

Cheers!

-Frinny
Aug 7 '07 #2
JLC
34 New Member
Yeah, I was able to get it working with C# on server side, but I had to click the submit button to get the text to populate the text box. I wanted to just be able to select the different choice in the dropdownlist and have it populate the text box. Mayb I did it wrong? It was like this...
Expand|Select|Wrap|Line Numbers
  1.  
  2.     protected void StatusDropDownList_SelectedIndexChanged1(object sender, EventArgs e)
  3.     {
  4.         string statusText = StatusDropDownList.Text;
  5.         if (statusText == "Down")
  6.         {
  7.             EmailTextBox.Text = "test for down selection";
  8.         }
  9.  
. It was much easier that way, but the person who wants this, wants it to be client side.

Is there something I am doing wrong here and it should update without clicking a submit button?

Thanks for the links too...I'll check them out.


Are you sure you want to use JavaScript instead of Server Side code to populate the TextBox?

There is a way to do it using JavaScript but it'd be easier to do with Server Side code....

You'd have to write a JavaScript that handles the onblur event for the DropDownList (which is an HTML <select> list) that takes the selected value and sets the TextBox's text (set the "value" property of the <input type="text"> element that is your TextBox)

If you really want to do this....I'd start my research on the w3c website...it has good examples and I have found it to be the best resource for JavaScript problems.

Also, you could check out the .NET article on How to check if a textbox contains a number for an example of how to use JavaScript in .NET.

Cheers!

-Frinny
Aug 7 '07 #3
Frinavale
9,735 Recognized Expert Moderator Expert
You shouldn't have to use a submit button to do this.
All you need to do is set the DropDownList's "autoPostBa ck" property to true...this will cause the DropDownList to postback to the server whenever the selected index changes.

Then you write the code that changes the text in your TextBox to be that of the DropDownList's selected value (or whatever) in the method that handles the selected index change.

But this solution is still using ServerSide code to solve the solution.
Did those links help you at all?

-Frinny

Yeah, I was able to get it working with C# on server side, but I had to click the submit button to get the text to populate the text box. I wanted to just be able to select the different choice in the dropdownlist and have it populate the text box. Mayb I did it wrong? It was like this...
Expand|Select|Wrap|Line Numbers
  1.  
  2.     protected void StatusDropDownList_SelectedIndexChanged1(object sender, EventArgs e)
  3.     {
  4.         string statusText = StatusDropDownList.Text;
  5.         if (statusText == "Down")
  6.         {
  7.             EmailTextBox.Text = "test for down selection";
  8.         }
  9.  
. It was much easier that way, but the person who wants this, wants it to be client side.

Is there something I am doing wrong here and it should update without clicking a submit button?

Thanks for the links too...I'll check them out.
Aug 8 '07 #4
JLC
34 New Member
Well I am not allowed to use a button, it just needs to fire on changing of the dropdownlist.

I have it working but only in an alert.

Is there a way to get what is captured in the alert and put it in my asp:textbox?

again...has to be only clientside.

I checked the links and I couldn't get it to work for what I was doing specifically.

Thanks

You shouldn't have to use a submit button to do this.
All you need to do is set the DropDownList's "autoPostBa ck" property to true...this will cause the DropDownList to postback to the server whenever the selected index changes.

Then you write the code that changes the text in your TextBox to be that of the DropDownList's selected value (or whatever) in the method that handles the selected index change.

But this solution is still using ServerSide code to solve the solution.
Did those links help you at all?

-Frinny
Aug 8 '07 #5
Frinavale
9,735 Recognized Expert Moderator Expert
Could you please post your code so that I can see what your doing with this alert....

Have you tried changing the DropDownList to AutoPostBack and setting the TextBox's Text value in the method that handles the index changed event?
Doing this will eliminate the need for a button and if you don't have to use JavaScript...it makes both our lives easier.

-Frinny

Well I am not allowed to use a button, it just needs to fire on changing of the dropdownlist.

I have it working but only in an alert.

Is there a way to get what is captured in the alert and put it in my asp:textbox?

again...has to be only clientside.

I checked the links and I couldn't get it to work for what I was doing specifically.

Thanks
Aug 8 '07 #6
JLC
34 New Member
Here's the code: I just tried the autopostback="t rue" in my dropdown list, but it didnt' seem to do anything.

Expand|Select|Wrap|Line Numbers
  1. <script type="text/javascript">
  2.     function EmailChangedText(ddid)
  3.     {
  4.         var selected = ddid.options[ddid.selectedIndex].value;
  5.  
  6.         alert(selected);  <-- this works
  7.         EmailTextBox.Value = selected;  <--this doesn't, but I want it to
  8.     }
  9.  
  10. </script>
  11.  

Could you please post your code so that I can see what your doing with this alert....

Have you tried changing the DropDownList to AutoPostBack and setting the TextBox's Text value in the method that handles the index changed event?
Doing this will eliminate the need for a button and if you don't have to use JavaScript...it makes both our lives easier.

-Frinny
Aug 8 '07 #7
Frinavale
9,735 Recognized Expert Moderator Expert
Change
Expand|Select|Wrap|Line Numbers
  1. <script type="text/javascript">
  2.     function EmailChangedText(ddid)
  3.     {
  4.         var selected = ddid.options[ddid.selectedIndex].value;
  5.  
  6.         alert(selected);  <-- this works
  7.         EmailTextBox.Value = selected;  <--this doesn't, but I want it to
  8.     }
  9.  
  10. </script>
  11.  
To be something like

Expand|Select|Wrap|Line Numbers
  1. <script type="text/javascript">
  2.     function EmailChangedText(ddid)
  3.     {
  4.         var selected = ddid.options[ddid.selectedIndex].value;
  5.  
  6.         /*alert(selected);  <-- this works*/
  7.        document.getElementById('EmailTextBox').Value = selected;  
  8.     }
  9.  
  10. </script>
  11.  
I'm assuming "EmailTextB ox" is the name of your TextBox as it appears in your HTML. If this is not the case, I suggest passing the EmailTextBox.Cl ientID into the function and using that in the place of 'EmailTextBox'. ...

Does this make any sense?
Aug 8 '07 #8
Frinavale
9,735 Recognized Expert Moderator Expert
Here's the code: I just tried the autopostback="t rue" in my dropdown list, but it didnt' seem to do anything.
I still think we should get to the bottom of why your DropDownList's autopostback isn't working properly....

Have you tried:
  • setting the autopostback="t rue"
  • double clicking the DropDownList (to get to the method that handles the postback event for the DropDownList)
  • adding EmailTextBox.Te xt=myDDL.Select edValue

....and if it doesn't work, have you tried setting break points in the method that handles the postback event to see why?

-Frinny
Aug 8 '07 #9
JLC
34 New Member
Yeah that makes sense...

EmailTextBox is the ID of my asp:TextBox

I added the document.getEle mentByID... but still nothing.

just a blank text box.

does it need to be a regular html text box? or can I use an asp:textbox?

Thanks,

Change
Expand|Select|Wrap|Line Numbers
  1. <script type="text/javascript">
  2.     function EmailChangedText(ddid)
  3.     {
  4.         var selected = ddid.options[ddid.selectedIndex].value;
  5.  
  6.         alert(selected);  <-- this works
  7.         EmailTextBox.Value = selected;  <--this doesn't, but I want it to
  8.     }
  9.  
  10. </script>
  11.  
To be something like

Expand|Select|Wrap|Line Numbers
  1. <script type="text/javascript">
  2.     function EmailChangedText(ddid)
  3.     {
  4.         var selected = ddid.options[ddid.selectedIndex].value;
  5.  
  6.         /*alert(selected);  <-- this works*/
  7.        document.getElementById('EmailTextBox').Value = selected;  
  8.     }
  9.  
  10. </script>
  11.  
I'm assuming "EmailTextB ox" is the name of your TextBox as it appears in your HTML. If this is not the case, I suggest passing the EmailTextBox.Cl ientID into the function and using that in the place of 'EmailTextBox'. ...

Does this make any sense?
Aug 8 '07 #10

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