form validation before direct click event fire

问题

I have a button,I want to form validation(client side) before direct click event fire.I tryed lots of way but failed.

** I already set textbox like this.

 <ext:TextField ID="Ad" runat="server" FieldLabel="Dem ad" Flex="1" AllowBlank="false" CausesValidation="true"> </ext:TextField>

but still fire direct even before textbox checking

<ext:Button ID="Button1" runat="server" Text="save" Icon="Disk">
                                  <DirectEvents>

                                    <Click OnEvent="Dem">
                                        <Confirmation ConfirmRequest="true"  Title="Title" Message="are u sure you want to update..." />

                                    </Click>

                                </DirectEvents>


                            </ext:Button>

回答1:

There is a few options.

You can return false from a DirectEvent's Before handler or from the same Listener.

protected void Submit(object sender, DirectEventArgs e) { X.Msg.Alert("Submit", "Submitted").Show(); }

Ext.NET v2 Example

    <ext:FormPanel ID="FormPanel1" runat="server">
        <Items>
            <ext:TextField runat="server" AllowBlank="false" />
        </Items>
    </ext:FormPanel>

    <ext:Button runat="server" Text="Submit">
        <%--<Listeners>
            <Click Handler="return false;" /> it has the same effect as returning false from a DirectEvent's Before.
        </Listeners>--%>
        <DirectEvents>
            <Click OnEvent="Submit" Before="return App.FormPanel1.isValid();" />
        </DirectEvents>
    </ext:Button>
</form>

Another approach is using FormBind. It automatically disables a component if a FormPanel is invalid. A component should belong to a FormPanel.

protected void Submit(object sender, DirectEventArgs e) { X.Msg.Alert("Submit", "Submitted").Show(); }

Ext.NET v2 Example

    <ext:FormPanel ID="FormPanel1" runat="server" Width="200">
        <Items>
            <ext:TextField runat="server" AllowBlank="false" />
        </Items>
        <Buttons>
            <ext:Button runat="server" Text="Submit" FormBind="true">
                <DirectEvents>
                    <Click OnEvent="Submit" />
                </DirectEvents>
            </ext:Button>
        </Buttons>
    </ext:FormPanel>
</form>

You can listen a FormPanel's ValidityChange event to apply some custom actions.

来源：https://stackoverflow.com/questions/17001045/form-validation-before-direct-click-event-fire

标签

extjs

ext.net