enable and disable asp validator using embedded code in asp tag dosent work

Question

enable and disable asp validator using embedded code in asp tag doesn't work, The value is written but control still is enabled. Please check the occurrences of

Enabled="<%# Convert.ToBoolean(txtText.Enabled) ? false : true%>"

in this form:

<form id="frmValidator" runat="server">
    <div>
        <asp:ValidationSummary
            ID="Summary"
            runat="server"
            HeaderText="Error(s):"
            CssClass="msg-error" />
        <asp:TextBox ID="txtText" runat="server" MaxLength="15" Enabled="false" />
        <asp:RequiredFieldValidator
            ID="rfvtxtText"
            runat="server"
            ControlToValidate="txtText"
            ErrorMessage="Requiered."
            Display="None"
            ClientValidationFunction=""
            SetFocusOnError="true"
            Enabled="<%# Convert.ToBoolean(txtText.Enabled) ? false : true%>" />

        <asp:RegularExpressionValidator
            ID="revtxtText"
            runat="server"
            ControlToValidate="txtText"
            Display="None"
            ErrorMessage="Invalid."
            ValidationExpression="[a-zA-ZñÑáéíóúÁÉÍÓÚ ,.*]{3,50}"
            SetFocusOnError="true"
            Enabled="<%# Convert.ToBoolean(txtText.Enabled) ? false : true%>" />

        <asp:Button
            ID="btnSave"
            runat="server"
            Text="Save" />
    </div>
<form>

txtText.Enabled does not need converting to boolean, doesn't it? — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Apr 29, 2015 at 16:05
Yes, but still is not working Enabled="<%# txtText.Enabled ? false : true%>" the validator continue with a true value — Alexander Osora Paulino Henrqu
– Alexander Osora Paulino Henrqu, Commented Apr 29, 2015 at 16:13

Win · Accepted Answer · 2015-04-29 17:25:57Z

1

The answer is you cannot.

<%# %> is Data Binding Expression Syntax. You cannot use it without ServerControl such as GridView, ListView.

Normally, we disable/enable control from code behind.

Javascript Method

Another approach is to disable validation using Javascript. However, you need to redirect to different page or do something after a button click. Otherwise, validation message will be displayed back to user after post back.

<script type="text/javascript">
    if (document.getElementById('<%= txtText.ClientID %>').getAttribute('disabled') === 'disabled') {
        alert('disabled');
        ValidatorEnable(document.getElementById('<%= rfvtxtText.ClientID %>'), false);
        ValidatorEnable(document.getElementById('<%= revtxtText.ClientID %>'), false);
    }
</script>

edited Apr 29, 2015 at 17:25

answered Apr 29, 2015 at 17:11

Win

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1 Comment

Alexander Osora Paulino Henrqu Over a year ago

disable validation using javascript change enebled value to false but still validator continue firing massage, i alert the validator and it is false

Community · Accepted Answer · 2017-05-23 11:44:32Z

0

In my opinion, it should be possible. Though I'm still a rookie myself, I always forget which code-nugget does what. I'd try <%: --expression-- %>.
The second answer to this question does a pretty good summary.

edited May 23, 2017 at 11:44

CommunityBot

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answered Apr 29, 2015 at 17:17

Sami

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1 Comment

Sami Over a year ago

Try with just <% --code-- %>. You should be able to use almost anything anywhere. Just remember to use a semicolon ( ; ) after the code in that nugget, just like in code-behind.

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