ASP.NET 文本框值改变表单自动提交

Question

想实现的功能是当文本框值改变的时候如果内容不为空则提交表单，调用后台的textchanged事件里面的处理函数，如果为空，则不提交表单只在浏览器处理。但是无论怎样都提交了表单。。。即会进入服务器的处理事件，整了4天了还没解决，求大牛指教！ 

<script type="text/javascript">
                                function WhenValueIsNull()
                                {
                                    var temptext = document.getElementById("MainContent_txtCaseNumber");

                                    if (temptext.value == "")
                                    {
                                        alert("空");
                                       
                                    }
                                  
                                    if (temptext.value != "")
                                    {
                                        alert("非空");
                                        document.getElementById("Form1").submit();

                                    }
                                }
                            </script>
                            <asp:TextBox ID="txtCaseNumber" runat="server"   OnTextChanged="txtCaseNumber_TextChanged"  onblur="WhenValueIsNull()" onsubmit="return false" AutoPostBack="True" Height="18px" Width="164px" ></asp:TextBox>

Answer 1

<asp:TextBox ID="txtCaseNumber" runat="server" onblur="WhenValueIsNull()" onsubmit="return false" AutoPostBack="True" Height="18px" Width="164px" ></asp:TextBox>

删除 OnTextChanged="txtCaseNumber_TextChanged"

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e-mail:[e-mail]

Answer 2

你好，

onblur="WhenValueIsNull()"  和 OnTextChanged="txtCaseNumber_TextChanged" 不要一起使用。

OnTextChanged 存在bug 必须是TextBox失去焦距或按回车才能触发。

我建议你只在敲回车的时候去触发WhenValueIsNull()：

 function WhenValueIsNull() {
                var temptext = document.getElementById("txtCaseNumber");
                if (window.event.keyCode ==13)
                {
                if (temptext.value == "") {
                    alert("空");

                }

                if (temptext.value != "") {
                    alert("非空");
                    document.getElementById("Form1").submit();


                }
            }
<asp:TextBox ID="txtCaseNumber" runat="server" onkeydown="WhenValueIsNull(this)" 
 onsubmit="return false" AutoPostBack="True" Height="18px" Width="164px" 
OnTextChanged="txtCaseNumber_TextChanged" ></asp:TextBox>

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