customvalidator based on visibility of control

Question

I have the custom validator code

<asp:CustomValidator ID="ddl1" ClientValidationFunction="IscontrolVisible" ControlToValidate="ddl1"
                            runat="server" ValidationGroup="ValSummary" Display="Dynamic" ErrorMessage="drop down invisible">*</asp:CustomValidator>

below is the function

 function IscontrolVisible(source, arguments) {
        //if ((document.getElementById(source).visibility == "visible")) {
        debugger;
        if (arguments.value == "" || arguments.value == "Select...") {
            arguments.IsValid = false;
        }
        else {
            arguments.IsValid = true;
        }
    }

how can i get the error message based on the visibility of the control?

freefaller freefaller · Accepted Answer · 2012-08-08T15:25:19

Use the source.controltovalidate property to get the ID of the control being validated, so use document.getElementById(source.controltovalidate) in your code.

However, you will only be able to detect whether the control you are validating on is visible if you are directly setting the visibility on the control itself.

In which case, you can do something like one of the following...

if (document.getElementById(source.controltovalidate).style.visibility !== "false") {
if (document.getElementById(source.controltovalidate).style.display !== "none") {

If the control is not visible because of one of it's parent controls, then it does NOT inherit the CSS styling of visibility or display. In which case you would have to recursively check all the ancestors of the control in question.

Additional

If you want to change the ErrorMessage text (note this will only change it locally on the browser, and will NOT be replicated back on the server after a postback), then the following should work for the validation summary message box popup and list/bullets...

source.errormessage = "New Error Message";

And the following should work for the message when shown as part of the validator itself...

source.innerHTML = "New Error Message";

customvalidator based on visibility of control

1 Answers