Required field/fields

hello , I am having four upload file controls , next to them 4 textbox's , and 1 checkbox , if the checkbox is checked , only 1 of the textbox's become available ...I want to check if each upload file if it has a file and the textbox's next to it isnt empty , or the only available one isnt empty , the idea that i am uploading 4 files or less , each uploaded file must have a title for it in the textbox , or one title for all the files , If someone can help me in the idea of the code for that in the upload button....I tried putting XOR code between each upload and textbox but internet explorer says webpage cannot be displayed when i press the upload button , i thought of required field validator that has it's valuetocompare changed during runtime , but I already had previous problems with it and i asked for it in forums and didnt get an answer...please help me in any thought for this , thanks alot !

11/17/2008 2:32:56 PM 91979 articles. 4 followers. Follow

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It should be possible to use a customValidator control on this on.  Just set it up on the page next to you file upload section, and give it an apporpriate error message.

<asp:customvalidator id="cvFileUpload" runat="server" errormessage="Error with file upload titles." clientvalidationfunction="fileUploadValidation">*</asp:customvalidator>

I have put together an example for the javascript validation function.

function fileUploadValidation(source, arguments)
 if (this.document.getElementById('CheckBox').checked == true)
  // all files should have own title
  for (i = 1; i <= 4; i++)
   if ((this.document.getElementById('uplFile' + i).value.length != 0) && (this.document.getElementById('txtTitle1' + i).value.length == 0))
    arguments.IsValid = false;
  // only one title all files
  if (this.document.getElementById('txtTitle1').value.length == 0)
   arguments.IsValid = false;

In the above code you will need the full controlID, you can get this from right click on page and choose view source.  Also here I have assumed that you have called them uplFile1 to uplFile4 and same on text boxes.  If you have named them differently you may just want to change the loop above to a few if statements instaed.


Hope this helps.



11/17/2008 4:08:46 PM

hmmmm...I wanted it to be by c# but i might use this javascript if it's the only solution at the moment , but in your code , if any one from the four file uploads is empty it's gonna give error , but I dont want that ...cause I might just upload 3 ones .


11/17/2008 5:00:39 PM


   if ((this.document.getElementById('uplFile' + i).value.length != 0) && (this.document.getElementById('txtTitle1' + i).value.length == 0))


yes, sorry I didn't test the code.

My thinking here was if uplFile was not 0 (had a value) and txtTitle has no value return false.  Maybe it could be altered to something like this

if (this.document.getElementById('uplFile' + i).value.length > 0)


 if (this.document.getElementById('txtTitle1' + i).value.length == 0)

  arguments.IsValid = false;


Custom validators  can be used to validate a individual control too.  Maybe a individual one like above snippet on the four txtTitle boxes.  You could just add in a check to see if the check box is checked.

Would you not be better to check this client side to save posting back a page when it is not valid?

11/17/2008 5:43:37 PM

hmmm , am sorry for the late reply but couldnt reply earlier

I tried the code you gave me , but there was always an error on lines containing this.document.getelementbyid , it says object required

i guess the problem goes cause of one of of these two reasons

the first one , that most of my page controls are inside a template in a loginview so the code cant reach them

second , i am doing an autopostback when i check the checkbox i have

where do u think the error lies ?!

thanks alot

11/17/2008 7:57:45 PM

There is a autoPostBack property on the checkbox control, you probably just need to set it to false.

The control will have a different name in your html source that is sent to the client causing you the problem of finding it, if you right click on the page and choose view source you will get it in notepad.  Then do a quick search on what the control is called and get the full name, e.g. a control on a user control callen Uc_Main would likely be Uc_Main_txtMyTextBox(it is the Id of the control you want so will ptob not be the one with the $ sign).  Or maybe something like ctl00_cph_Main_txtMyTextBox.

The javascript is case sensitive so you should keep the case on 'this.document.getElementById', or '$get' should work instead.

11/18/2008 9:27:09 AM


I just quickly put this together to demonstrate.  I dont have the controls on a user control but you shouldn't have a problem getting your control Id.

<script language="javascript">
    function dissableTextBoxes() {
        if (this.document.getElementById('Checkbox1').checked == true) {
            this.document.getElementById('Text2').disabled = true;
            this.document.getElementById('Text3').disabled = true;
        else {
            this.document.getElementById('Text2').disabled = false;
            this.document.getElementById('Text3').disabled = false;
    function fileUploadValidation(source, arguments) {debugger;
        if (this.document.getElementById('Checkbox1').checked == false) {
            // all files should have own title
            for (i = 1; i <= 3; i++) {
                if ((this.document.getElementById('FileUpload' + i).value.length != 0) && (this.document.getElementById('Text' + i).value.length == 0))
                    arguments.IsValid = false;
        else {
            // only one title all files
            if (this.document.getElementById('Text1').value.length == 0)
                arguments.IsValid = false;
    <form id="form1" runat="server">
        <asp:ValidationSummary ID="ValidationSummary1" runat="server" />
        Name all the same
        <input id="Checkbox1" type="checkbox" onclick="dissableTextBoxes()" /><br />
        <asp:FileUpload ID="FileUpload1" runat="server" />
        Title:<input id="Text1" type="text" /><asp:CustomValidator
            ID="CustomValidator1" runat="server" ErrorMessage="File must have a title." ClientValidationFunction="fileUploadValidation" Text="*"></asp:CustomValidator>
        <br />
        <asp:FileUpload ID="FileUpload2" runat="server" />
        Title:<input id="Text2" type="text" /><br />
        <asp:FileUpload ID="FileUpload3" runat="server" />
        Title:<input id="Text3" type="text" /><br />
        <asp:Button ID="btnUpload" runat="server" Text="Upload" />
        <br />

I have tested this, so it should work for you.

11/18/2008 9:57:48 AM

Hello dean , thanks alot it worked for me , my problem was just with finding the controls , and I did as you told me , I ran the application and viewed the source and got the titles from there and it worked...thanks alot !

11/18/2008 6:34:21 PM

Your'e welcome.

Nice to know it's you got it sorted :)

11/19/2008 9:22:33 AM

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