比较校验不停止回传 [英] Compare validator doesn't stop postback

问题描述

Below is my mark up. 

<asp:TextBox ID="txtPatientDateOfBirth" runat="server" 
    CssClass="rightDivInnerControls" ClientIDMode="Static" 
    CausesValidation="True">
</asp:TextBox>
<asp:CompareValidator ID="cvPatientDateOfBirth" runat="server" 
    ErrorMessage="Enter proper date." 
    Type="Date" ControlToValidate="txtPatientDateOfBirth" Font-Bold="True"  
    Operator="DataTypeCheck"
    ValidationGroup="FirstPreview">
</asp:CompareValidator>    

<asp:Button ID="btnSaveChanges" runat="server" 
    Text="Save Changes"  OnClientClick="return showFinalReviewAlert();" 
    CssClass="btnPrimary hideInPrint btnEditFinalReport" 
    ValidationGroup="FirstPreview" 
    onclick="btnSaveChanges_Click"  ClientIDMode="Static"/>

当我将日期更改为一个格式错误立即显示我在错误信息即可。

When I change the date to a wrong format it shows me the error message immediately.

但是，当我点击按钮btnSaveChanges它做了回发。我觉得缺了点什么，因为它的它做回发。

But when I click on the button "btnSaveChanges" it does a postback. I think something is missing because of which it is doing postback.

任何人都可以帮我这个问题。我想的停止回传，如果验证失败

Can anyone please help me with the issue. I want to stop the postback if validation fails.

感谢。

推荐答案

通过返回 showFinalReviewAlert（的价值）; 在的OnClientClick 按钮，你是从发生阻塞页面验证。

By returning the value of showFinalReviewAlert(); in the OnClientClick of the button, you are blocking the page validation from happening.

这实际上是所呈现的HTML（简化观看）...

This is effectively the HTML that is being rendered (simplified for viewing)...

<input type="submit" 
       id="btnSaveChanges" 
       onclick="return showFinalReviewAlert();WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions(&quot;btnSaveChanges;, &quot;&quot;, true, &quot;&quot;, &quot;&quot;, false, false))" 
       name="btnSaveChanges">

这最重要的一点就是...

The important bit of this is...

onclick="return showFinalReviewAlert();WebForm_DoPostBackWithOptions....

它的意思是，不管什么 showFinalReviewAlert（）返回时， WebForm_DoPostBackWithOptions 将永远不会达到。但是，因为它是一个＆LT;输入类型=提交方式＆gt; 页面将发布包到服务器反正

What it means is that no matter what showFinalReviewAlert() returns, the WebForm_DoPostBackWithOptions will never be reached. However, because it is an <input type="submit"> the page will post-pack to the server anyway.

所以，如果返回值 showFinalReviewAlert 必须停止从返回值发生后回假，你应该设置的OnClientClick 属性，因为...

So, if the return value of the showFinalReviewAlert must stop the post-back from happening by returning the value false, you should set the OnClientClick attribute as this...

OnClientClick="if(showFinalReviewAlert()==false){return false;}"

在换句话说，如果 showFinalReviewAlert 收益假然后持续回任何后期处理停止键.. 。但如果返回真正，然后让回来后验证的发生。

In other words, if showFinalReviewAlert return false then stop the button from continuing any post-back processing... but if it return true, then allow the post-back validation to take place.

在另一方面，如果 showFinalReviewAlert的结果（）没关系......只要将收益给简单...

On the other hand, if the result of showFinalReviewAlert() doesn't matter... simply remove the return to give simply...

OnClientClick="showFinalReviewAlert();"

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