.net中正则表达式的客户端验证–javascript-ASP教程,正则表达式

.net中客户端验证可以用微软自带的验证控件，但明显没有直接写的javascript来得简单有效，请参照以下三步：
第一：form如下：

<form id=“form1“ method=“post“ runat=“server“>
            <font face=“宋体“></font><font face=“宋体“></font>
            <br>
            1. name :<br>
            <asp:textbox id=“txtname“ runat=“server“ /><br>
            2. email :<br>
            <asp:textbox id=“txtemail“ runat=“server“ /><br>
            3. web url :<br>
            <asp:textbox id=“txtweburl“ runat=“server“ /><br>
            4. zip :<br>
            <asp:textbox id=“txtzip“ runat=“server“ /><br>
            5.content<br>
            <asp:textbox id=“txtcontent“ runat=“server“ textmode=“multiline“ width=“504px“ height=“80px“ />
            <br>
            <asp:button id=“btnsubmit“ onclientclick=“ return validate()“ runat=“server“ text=“submit“ />
        </form>

第二：调用函数如下（可自行扩展）

<script language=“javascript“ type=“text/javascript“>
                function validate()
                        …{
                            if (document.getelementbyid(“<%=txtname.clientid%>“).value==“”)
                            …{
                                        alert(“name feild can not be blank“);
                                        document.getelementbyid(“<%=txtname.clientid%>“).focus();
                                        return false;
                            }
                            if(document.getelementbyid(“<%=txtemail.clientid %>“).value==“”)
                            …{
                                        alert(“email id can not be blank“);
                                        document.getelementbyid(“<%=txtemail.clientid %>“).focus();
                                        return false;
                            }
                            // var emailpat = /^(“.*”|[a-za-z]w*)@([d{1,3}(.d{1,3}){3}]|[a-za-z]w*(.[a-za-z]w*)+)$/;
                            //var emailpat = “w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*”;
                            //var emailpat    =    /^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/;
                            //var emailpat    =    ^([w]+@([w]+.)+[a-za-z]{2,9}(s*;s*[w]+@([w]+.)+[a-za-z]{2,9})*)$;
                            var emailpat    =    “^[a-za-z0-9_.]+@[a-za-z0-9-]+[.a-za-z]+$“;
                            var emailid=document.getelementbyid(“<%=txtemail.clientid %>“).value;
                            var matcharray = emailid.match(emailpat);
                            if (matcharray == null)
                            …{
                                    alert(“your email address seems incorrect. please try again.“);
                                    document.getelementbyid(“<%=txtemail.clientid %>“).focus();
                                    return false;
                            }
                            if(document.getelementbyid(“<%=txtweburl.clientid %>“).value==“”)
                            …{
                                    alert(“web url can not be blank“);
                                    document.getelementbyid(“<%=txtweburl.clientid %>“).value=“http://“
                                    document.getelementbyid(“<%=txtweburl.clientid %>“).focus();
                                    return false;
                            }
                            var url=“^[a-za-z]+://[a-za-z0-9-_]+\.[a-za-z0-9-_%&?/.=]+$“
                            var tempurl=document.getelementbyid(“<%=txtweburl.clientid%>“).value;
                            var matchurl=tempurl.match(url);
                            if(matchurl==null)
                            …{
                                    alert(“web url does not look valid“);
                                    document.getelementbyid(“<%=txtweburl.clientid %>“).focus();
                                    return false;
                            }
                            if (document.getelementbyid(“<%=txtzip.clientid%>“).value==“”)
                            …{
                                    alert(“zip code is not valid“);
                                    document.getelementbyid(“<%=txtzip.clientid%>“).focus();
                                    return false;
                            }
                            var digits=“0123456789“;
                            var temp;
                            for (var i=0;i<document.getelementbyid(“<%=txtzip.clientid %>“).value.length;i++)
                            …{
                                    temp=document.getelementbyid(“<%=txtzip.clientid%>“).value.substring(i,i+1);
                                    if (digits.indexof(temp)==-1)
                                    …{
                                                alert(“please enter correct zip code“);
                                                document.getelementbyid(“<%=txtzip.clientid%>“).focus();
                                                return false;
                                    }
                            }
                            var contentlength=“”;
                            if (document.getelementbyid(“<%=txtcontent.clientid%>“).value==“”)
                            …{
                                    alert(“content is need!“);
                                    document.getelementbyid(“<%=txtcontent.clientid%>“).focus();
                                    return false;
                            }
                            else if(document.getelementbyid(“<%=txtcontent.clientid%>“).value.length>100)
                            …{
                                alert(“content is too long,and more than 100 chars!“);
                                    document.getelementbyid(“<%=txtcontent.clientid%>“).focus();
                                    return false;
                            }
                            return true;
                        }
        </script>

第三：page_load事件中加入一行：

private void page_load(object sender, system.eventargs e)
        …{
             btnsubmit.attributes.add(“onclick”, “return validate()”);
        }