asp中如何判断表单内容不能为空？

Posted 2023-05-13

<form action="test.asp" method="post">
<p>姓名：
<input name="name" type="text">
</p>
<p> 年龄：
<input name="age" type="text">
</p>
<p>性别：
<select name="sex" size="1">
<option>男</option>
<option>女</option>
</select>
</p>
<label>
<input type="submit" name="Submit" value="提交">
</label>
</form>
这个表单，怎么判断，如果是空的，就提示不能为空，如果不是空的就把焦点移到下一个输入位置。
最好能判断输入的是不是正确的？比如名字不能为数字，符号啊？
谢谢大家帮助？

第一步：把这段代码贴入你的页面
<script language="javascript">
function CheckForm()


if (document.form1.name.value.length == 0)
alert("用户名没有填写！");
document.form1.name.focus();
return false;


return true;

</script>
第二步：设置下提交按钮
<input type="submit" name="button" id="button" value="提交" onclick="return CheckForm();" />

其他的判断你还可以用同样的方法添加，OK测试下看看。 参考技术A 先接受传递过来的变量:name=request.form('name')，再判断if(name<>"")response.write "用户名不为空";
要判断数字或字符的话可以用正则表达式。另外建议用JAVASCRIPT做以上判断，用ASP判断只会拖累服务器，用前端的JS反应速度会很快，或者xjax 参考技术B 上网下载一个JS的验证类，这样以后就剩事很多。

下面给你一个，你复制下来保存为JS文件就可以用了。后面有详细的例子，方便你用

/*************************************************
Validator v1.05
*************************************************/
Validator =
Require : /.+/,
Email : /^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/,
Phone : /^((\(\d2,3\))|(\d3\-))?(\(0\d2,3\)|0\d2,3-)?[1-9]\d6,7(\-\d1,4)?$/,
Mobile : /^((\(\d2,3\))|(\d3\-))?13\d9$/,
Url : /^http:\/\/[A-Za-z0-9]+\.[A-Za-z0-9]+[\/=\?%\-&_~`@[\]\':+!]*([^<>\"\"])*$/,
IdCard : "this.IsIdCard(value)",
Currency : /^\d+(\.\d+)?$/,
Number : /^\d+$/,
Zip : /^[1-9]\d5$/,
QQ : /^[1-9]\d4,8$/,
Integer : /^[-\+]?\d+$/,
Double : /^[-\+]?\d+(\.\d+)?$/,
English : /^[A-Za-z]+$/,
Chinese : /^[\u0391-\uFFE5]+$/,
Username : /^[a-z]\w3,$/i,
UnSafe : /^(([A-Z]*|[a-z]*|\d*|[-_\~!@#\$%\^&\*\.\(\)\[\]\\<>\?\\\/\'\"]*)|.0,5)$|\s/,
IsSafe : function(str)return !this.UnSafe.test(str);,
SafeString : "this.IsSafe(value)",
Filter : "this.DoFilter(value, getAttribute('accept'))",
Limit : "this.limit(value.length,getAttribute('min'), getAttribute('max'))",
LimitB : "this.limit(this.LenB(value), getAttribute('min'), getAttribute('max'))",
Date : "this.IsDate(value, getAttribute('min'), getAttribute('format'))",
Repeat : "value == document.getElementsByName(getAttribute('to'))[0].value",
Range : "getAttribute('min') < (value|0) && (value|0) < getAttribute('max')",
Compare : "this.compare(value,getAttribute('operator'),getAttribute('to'))",
Custom : "this.Exec(value, getAttribute('regexp'))",
Group : "this.MustChecked(getAttribute('name'), getAttribute('min'), getAttribute('max'))",
ErrorItem : [document.forms[0]],
ErrorMessage : ["Failure to submit：\t\t\t\t"],
Validate : function(theForm, mode)
var obj = theForm || event.srcElement;
var count = obj.elements.length;
this.ErrorMessage.length = 1;
this.ErrorItem.length = 1;
this.ErrorItem[0] = obj;
for(var i=0;i<count;i++)
with(obj.elements[i])
var _dataType = getAttribute("dataType");
if(typeof(_dataType) == "object" || typeof(this[_dataType]) == "undefined") continue;
this.ClearState(obj.elements[i]);
if(getAttribute("require") == "false" && value == "") continue;
switch(_dataType)
case "IdCard" :
case "Date" :
case "Repeat" :
case "Range" :
case "Compare" :
case "Custom" :
case "Group" :
case "Limit" :
case "LimitB" :
case "SafeString" :
case "Filter" :
if(!eval(this[_dataType]))
this.AddError(i, getAttribute("msg"));

break;
default :
if(!this[_dataType].test(value))
this.AddError(i, getAttribute("msg"));

break;



if(this.ErrorMessage.length > 1)
mode = mode || 1;
var errCount = this.ErrorItem.length;
switch(mode)
case 2 :
for(var i=1;i<errCount;i++)
this.ErrorItem[i].style.color = "red";
case 1 :
alert(this.ErrorMessage.join("\n"));
this.ErrorItem[1].focus();
break;
case 3 :
for(var i=1;i<errCount;i++)
try
var span = document.createElement("SPAN");
span.id = "__ErrorMessagePanel";
span.style.color = "red";
this.ErrorItem[i].parentNode.appendChild(span);
span.innerhtml = this.ErrorMessage[i].replace(/\d+:/,"*");

catch(e)alert(e.description);

this.ErrorItem[1].focus();
break;
default :
alert(this.ErrorMessage.join("\n"));
break;

return false;

return true;
,
limit : function(len,min, max)
min = min || 0;
max = max || Number.MAX_VALUE;
return min <= len && len <= max;
,
LenB : function(str)
return str.replace(/[^\x00-\xff]/g,"**").length;
,
ClearState : function(elem)
with(elem)
if(style.color == "red")
style.color = "";
var lastNode = parentNode.childNodes[parentNode.childNodes.length-1];
if(lastNode.id == "__ErrorMessagePanel")
parentNode.removeChild(lastNode);

,
AddError : function(index, str)
this.ErrorItem[this.ErrorItem.length] = this.ErrorItem[0].elements[index];
this.ErrorMessage[this.ErrorMessage.length] = this.ErrorMessage.length + ":" + str;
,
Exec : function(op, reg)
return new RegExp(reg,"g").test(op);
,
compare : function(op1,operator,op2)
switch (operator)
case "NotEqual":
return (op1 != op2);
case "GreaterThan":
return (op1 > op2);
case "GreaterThanEqual":
return (op1 >= op2);
case "LessThan":
return (op1 < op2);
case "LessThanEqual":
return (op1 <= op2);
default:
return (op1 == op2);

,
MustChecked : function(name, min, max)
var groups = document.getElementsByName(name);
var hasChecked = 0;
min = min || 1;
max = max || groups.length;
for(var i=groups.length-1;i>=0;i--)
if(groups[i].checked) hasChecked++;
return min <= hasChecked && hasChecked <= max;
,
DoFilter : function(input, filter)
return new RegExp("^.+\.(?=EXT)(EXT)$".replace(/EXT/g, filter.split(/\s*,\s*/).join("|")), "gi").test(input);
,
IsIdCard : function(number)
var date, Ai;
var verify = "10x98765432";
var Wi = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];
var area = ['','','','','','','','','','','','北京','天津','河北','山西','内蒙古','','','','','','辽宁','吉林','黑龙江','','','','','','','','上海','江苏','浙江','安微','福建','江西','山东','','','','河南','湖北','湖南','广东','广西','海南','','','','重庆','四川','贵州','云南','西藏','','','','','','','陕西','甘肃','青海','宁夏','新疆','','','','','','台湾','','','','','','','','','','香港','澳门','','','','','','','','','国外'];
var re = number.match(/^(\d2)\d4(((\d2)(\d2)(\d2)(\d3))|((\d4)(\d2)(\d2)(\d3[x\d])))$/i);
if(re == null) return false;
if(re[1] >= area.length || area[re[1]] == "") return false;
if(re[2].length == 12)
Ai = number.substr(0, 17);
date = [re[9], re[10], re[11]].join("-");

else
Ai = number.substr(0, 6) + "19" + number.substr(6);
date = ["19" + re[4], re[5], re[6]].join("-");

if(!this.IsDate(date, "ymd")) return false;
var sum = 0;
for(var i = 0;i<=16;i++)
sum += Ai.charAt(i) * Wi[i];

Ai += verify.charAt(sum%11);
return (number.length ==15 || number.length == 18 && number == Ai);
,
IsDate : function(op, formatString)
formatString = formatString || "ymd";
var m, year, month, day;
switch(formatString)
case "ymd" :
m = op.match(new RegExp("^((\\d4)|(\\d2))([-./])(\\d1,2)\\4(\\d1,2)$"));
if(m == null ) return false;
day = m[6];
month = m[5]*1;
year = (m[2].length == 4) ? m[2] : GetFullYear(parseInt(m[3], 10));
break;
case "dmy" :
m = op.match(new RegExp("^(\\d1,2)([-./])(\\d1,2)\\2((\\d4)|(\\d2))$"));
if(m == null ) return false;
day = m[1];
month = m[3]*1;
year = (m[5].length == 4) ? m[5] : GetFullYear(parseInt(m[6], 10));
break;
default :
break;

if(!parseInt(month)) return false;
month = month==0 ?12:month;
var date = new Date(year, month-1, day);
return (typeof(date) == "object" && year == date.getFullYear() && month == (date.getMonth()+1) && day == date.getDate());
function GetFullYear(y)return ((y<30 ? "20" : "19") + y)|0;


/*<title>表单验证类 Validator v1.05</title>
<style>
body,tdfont:normal 12px Verdana;color:#333333
input,textarea,select,tdfont:normal 12px Verdana;color:#333333;border:1px solid #999999;background:#ffffff
tableborder-collapse:collapse;
tdpadding:3px
inputheight:20;
textareawidth:80%;height:50px;overflow:auto;
formdisplay:inline
</style>
<table align="center">
<form name="theForm" id="demo" method="get" onSubmit="return Validator.Validate(this,2)">
<tr>
<td>身份证号：</td><td><input name="Card" dataType="IdCard" msg="身份证号错误"></td>
</tr>
<tr>
<td>真实姓名：</td><td><input name="Name" dataType="Chinese" msg="真实姓名只允许中文"></td>
</tr>
<tr>
<td>ID：</td><td><input name="username" dataType="Username" msg="ID名不符合规定"></td>
</tr>
<tr>
<td>英文名：</td><td><input name="Nick" dataType="English" require="false" msg="英文名只允许英文字母"></td>
</tr>
<tr>
<td>主页：</td><td><input name="Homepage" require="false" dataType="Url" msg="非法的Url"></td>
</tr>
<tr>
<td>密码：</td><td><input name="Password" dataType="SafeString" msg="密码不符合安全规则" type="password"></td>
</tr>
<tr>
<td>重复：</td><td><input name="Repeat" dataType="Repeat" to="Password" msg="两次输入的密码不一致" type="password"></td>
</tr>
<tr>
<td>信箱：</td><td><input name="Email" dataType="Email" msg="信箱格式不正确"></td>
</tr>
<tr>
<td>信箱：</td><td><input name="Email" dataType="Repeat" to="Email" msg="两次输入的信箱不一致"></td>
</tr>
<tr>
<td>QQ：</td><td><input name="QQ" require="false" dataType="QQ" msg="QQ号码不存在"></td>
</tr>
<tr>
<td>身份证：</td><td><input name="Card" dataType="IdCard" msg="身份证号码不正确"></td>
</tr>
<tr>
<td>年龄：</td><td><input name="Year" dataType="Range" msg="年龄必须在18~28之间" min="18" max="28"></td>
</tr>
<tr>
<td>年龄1：</td><td><input name="Year1" require="false" dataType="Compare" msg="年龄必须在18以上" to="18" operator="GreaterThanEqual"></td>
</tr>
<tr>
<td>电话：</td><td><input name="Phone" require="false" dataType="Phone" msg="电话号码不正确"></td>
</tr>
<tr>
<td>手机：</td><td><input name="Mobile" require="false" dataType="Mobile" msg="手机号码不正确"></td>
</tr>
<tr>
<td>生日：</td><td><input name="Birthday" dataType="Date" format="ymd" msg="生日日期不存在"></td>
</tr>
<tr>
<td>邮政编码：</td><td><input name="Zip" dataType="Custom" regexp="^[1-9]\d5$" msg="邮政编码不存在"></td>
</tr>
<tr>
<td>邮政编码：</td><td><input name="Zip1" dataType="Zip" msg="邮政编码不存在"></td>
</tr>
<tr>
<td>操作系统：</td><td><select name="Operation" dataType="Require" msg="未选择所用操作系统" ><option value="">选择您所用的操作系统</option><option value="Win98">Win98</option><option value="Win2k">Win2k</option><option value="WinXP">WinXP</option></select></td>
</tr>
<tr>
<td>所在省份：</td><td>广东<input name="Province" value="1" type="radio">陕西<input name="Province" value="2" type="radio">浙江<input name="Province" value="3" type="radio">江西<input name="Province" value="4" type="radio" dataType="Group" msg="必须选定一个省份" ></td>
</tr>
<tr>
<td>爱好：</td><td>运动<input name="Favorite" value="1" type="checkbox">上网<input name="Favorite" value="2" type="checkbox">听音乐<input name="Favorite" value="3" type="checkbox">看书<input name="Favorite" value="4" type="checkbox"" dataType="Group" min="2" max="3" msg="必须选择2~3种爱好"></td>
</tr>
<td>自我介绍：</td><td><textarea name="Description" dataType="Limit" max="10" msg="自我介绍内容必须在10个字之内">中文是一个字</textarea></td>
</tr>
<td>自传：</td><td><textarea name="History" dataType="LimitB" min="3" max="10" msg="自传内容必须在[3,10]个字节之内">中文是两个字节t</textarea></td>
</tr>
<tr>
<td>相片上传：</td><td><input name="up" dataType="Filter" msg="非法的文件格式" type="file" accept="jpg, gif, png"></td>
</tr>
<tr>
<td colspan="2"><input name="Submit" type="submit" value="确定提交"><input onClick="Validator.Validate(document.getElementById('demo'))" value="检验模式1" type="button"><input onClick="Validator.Validate(document.getElementById('demo'),2)" value="检验模式2" type="button"><input onClick="Validator.Validate(document.getElementById('demo'),3)" value="检验模式3" type="button"></td>
</tr>
</form>
</table>
*/ 参考技术C 建议你去学下javascript
学了这个保你知道怎么做，网页制作必备的

jquery判断表单内容是否为空

 1 //判断表单数据是否为空
 2       var t = $(‘form‘).serializeArray();
 3         $.each(t,function(i,item){
 4             if(item[‘value‘] == ‘‘) {
 5                 console.log(‘信息不可为空‘) 
 6                 showMsg(‘信息不可为空‘)
 7                 flag = 1;
 8                 return false
 9             } else {
10             flag = 0;
11         }
12         })