ASP.NET c# Only validate part of a form if checkbox checked

Question

Given:

    <div class="subHead">Stock Options</div>
    <table class="settingTable">
        <tr>
            <td colspan="2"><b>Limited Stock</b></td>
        </tr>
        <tr>
            <td width="50" align="center"><asp:CheckBox ID="limitedStock" runat="server" /></td>
            <td>If checked this product will have a limited stock</td>
        </tr>
    </table>
    <table class="settingTable">
        <tr>
            <td colspan="2"><b>Stock Count</b></td>
        </tr>
        <tr>
            <td>
                <asp:TextBox ID="stockCount" runat="server" CssClass="tbox"></asp:TextBox>
                <asp:RequiredFieldValidator runat="server"
                          id="RequiredFieldValidator2"
                          ControlToValidate="stockCount"
                          ErrorMessage="You need to enter a value"
                          display="Dynamic" />
                <asp:RangeValidator runat="server"
                    id="rangeVal1"
                    MinimumValue="0" MaximumValue="999999999999"                        
                    ControlToValidate="stockCount"
                    ErrorMessage="Enter a numeric value of at least 0"
                    display="Dynamic" />
            </td>
        </tr>
    </table>

How do I make it so that the validator for the stock count wont run unless the limited stock checkbox is checked?

Daniel Dyson · Accepted Answer · 2010-08-25 10:08:30Z

Use a CustomValidator instead. See the section on Client Side Validation at the bottom of this page: http://msdn.microsoft.com/en-us/library/f5db6z8k%28VS.71%29.aspx

You can use a script that checks the value of the checkbox and performs your validation.

<script language="text/javascript">
    function validateStockCount(oSrc, args){
       //Use JQuery to look for the checked checkbox and only if it is found, validate
       if($('.limitedStock:checked') == undefined) {
           args.IsValid = true;
       }
       else {
           args.IsValid = (args.Value.length >= 0) && (args.Value.length <= 999999999999);

       }
    }
</script>

<asp:CheckBox ID="limitedStock" runat="server" CssClass="limitedStock" />

<asp:TextBox ID="stockCount" runat="server" CssClass="tbox"></asp:TextBox>

<asp:CustomValidator id="CustomValidator1" runat=server 
   ControlToValidate = "stockCount"
   ErrorMessage = "You need to enter a numeric value of at least 0!"
   ClientValidationFunction="validateStockCount" >
</asp:CustomValidator>

James Culshaw · Accepted Answer · 2010-08-25 09:59:56Z

2

You could set AutoPostBack to true on the checkbox and then in the checkbox event you could enable/disbale the required field validator.

In the aspx page set the AutoPostBack property of the checkbox

<asp:CheckBox ID="limitedStock" runat="server" AutoPostBack="True" />

In the CheckChanged event of the checkbox you just set the Enabled property of the RequiredFieldValidator as required:

RequiredFieldValidator2.Enabled = limitedStock.Checked;

James :-)

answered Aug 25, 2010 at 9:59

James Culshaw

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