表单验证—js循环所有表单验证

【封装为表单验证的专用js，所有表单页面都可以调用】

1、表单

<form id="regForm" method="post" action="index/register" onsubmit="checkForm(this)">
....
<td><label class="ui-green"><input type="submit" name="submit" value="提交注册" /></label></td>

2、验证form表单

function checkForm(frm)
{   

    var els = frm.getElementsByTagName("input");
    for(var i=0; i<els.length; i++) {
        if(typeof(els[i].getAttribute("onblur")) == "function") {
            if(!CheckItem(els[i])) return false;
        }
    }
    return true;
}

3、验证该表单下的所有input框

function CheckItem(obj)
{
    //将input提示框的内容赋空
    obj.parentNode.parentNode.className = "";

    var msgBox = obj.parentNode.getElementsByTagName("span")[0];
    switch(obj.name) {

        case "regUserName":

                        //这后面的业务可以单独提出来作为一个方法
            if(obj.value == "") {
                msgBox.innerHTML = "密码不能为空！";
                                //添加className方便统一管理样式
                msgBox.className = "error";
                return false;
            }else{
                //用户名被占用
                $.ajax({
                     "url":"index/hasname",
                    "data":"username="+obj.value,
                    "type":"post",
                "dataType":"json",
                 "success":function(data){
                        if(data=="1"){
                            msgBox.innerHTML = "用户名已存在！";
                            msgBox.className = "error";
                            return false;
                        }else{
                            //用户名可用
                            msgBox.innerHTML = "用户名可用！";
                            msgBox.className = "nameinfo";
                        }
                    }
                });
            }
            break;

        case "userName":
            if(obj.value == "") {
                msgBox.innerHTML = "密码不能为空！";
                msgBox.className = "error";
                return false;
            }
            break;
        case "passWord":
            if(obj.value == "") {

                msgBox.innerHTML = "密码不能为空！";
                msgBox.className = "error";
                return false;
            }
            break;
        case "rePassWord":
            if(obj.value == "") {
                msgBox.innerHTML = "密码不能为空！";
                msgBox.className = "error";
                return false;
            } else if(obj.value != document.getElementById("passWord").value) {
                msgBox.innerHTML = "两次密码不一致！";
                msgBox.className = "error";
                return false;
            }
            break;
        case "veryCode":
            if(obj.value == "") {
                msgBox.innerHTML = "验证码不能为空！";
                msgBox.className = "error";
                return false;
            }
            break;
    }
    return true;
}