实用的JS表单验证提示效果_表单特效-js教程-PHP中文网

errMsg 是一个错误消息的数组，这样方便自定义,errName是对应错误信息元件名数组，这样可以非富自定义显示方式，FormValid.allName记录了所有有验证规则的字段名数级，在自定义中可以使用到。

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<title>表单验证提示效果</title>
<style type="text/css"> 
body{ color:#666666; font-size:12px} 
h1{ font-size:20px;} 
input{ border:#999999 1px solid; background-color:#FFFFEE} 
.button2{ background-color:#FF9900; border-bottom:#E34A00 2px solid;border-right:#E34A00 2px solid; border-top:#FFB693 2px solid;border-left:#FFB693 2px solid; color:#FFFFFF; font-weight:bold} 
dl { 
font:normal 12px/15px Arial; 
position: relative; 
width: 350px; 
} 
dt { 
clear: both; 
float:left; 
width: 80px; 
padding: 4px 0 2px 0; 
text-align: left; 
} 
dd { 
float: left; 
width: 200px; 
margin: 0 0 8px 0; 
padding-left: 6px; 
}

.hint { 
display: none; 
position: absolute; 
right: -160px; 
width: 200px; 
margin-top: -4px; 
border: 1px solid #c93; 
padding: 10px 12px; 
background: #ffc url(/upload/2009-11/20091104144511488.gif) no-repeat -10px 5px; 
}

.hint .hint-pointer { 
position: absolute; 
left: -10px; 
top: 5px; 
width: 10px; 
height: 19px; 
background: url(/upload/2009-11/20091104144511488.gif) left top no-repeat; 
} 
</style>
<script language="JavaScript" type="text/javascript"> 
var FormValid = function(frm) { 
this.frm = frm; 
this.errMsg = new Array(); 
    this.errName = new Array();

this.required = function(inputObj) { 
if (typeof(inputObj) == "undefined" || inputObj.value.trim() == "") { 
return false; 
} 
        return true; 
}

this.eqaul = function(inputObj, formElements) { 
        var fstObj = inputObj; 
        var sndObj = formElements[inputObj.getAttribute('eqaulName')]; 
         
if (fstObj != null && sndObj != null) { 
if (fstObj.value != sndObj.value) { 
return false; 
} 
} 
        return true; 
}

this.gt = function(inputObj, formElements) { 
        var fstObj = inputObj; 
        var sndObj = formElements[inputObj.getAttribute('eqaulName')]; 
         
if (fstObj != null && sndObj != null && fstObj.value.trim()!='' && sndObj.value.trim()!='') { 
if (fstObj.value <= sndObj.value) { 
return false; 
} 
} 
        return true; 
}

this.compare = function(inputObj, formElements) { 
        var fstObj = inputObj; 
        var sndObj = formElements[inputObj.getAttribute('objectName')]; 
if (fstObj != null && sndObj != null && fstObj.value.trim()!='' && sndObj.value.trim()!='') { 
if (!eval('fstObj.value' + inputObj.getAttribute('operate') + 'sndObj.value')) { 
return false; 
} 
} 
        return true; 
    } 
     
    this.limit = function (inputObj) { 
        var len = inputObj.value.length; 
        if (len) { 
            var minv = inputObj.getAttribute('min'); 
            var maxv = inputObj.getAttribute('max'); 
            minv = minv || 0; 
            maxv = maxv || Number.MAX_VALUE; 
            return minv <= len && len <= maxv; 
        } 
        return true; 
    } 
     
    this.range = function (inputObj) { 
        var val = parseInt(inputObj.value); 
        if (inputObj.value) { 
            var minv = inputObj.getAttribute('min'); 
            var maxv = inputObj.getAttribute('max'); 
            minv = minv || 0; 
            maxv = maxv || Number.MAX_VALUE; 
         
            return minv <= val && val <= maxv; 
        } 
        return true; 
    } 
     
    this.requireChecked = function (inputObj) { 
        var minv = inputObj.getAttribute('min'); 
        var maxv = inputObj.getAttribute('max'); 
        minv = minv || 1; 
        maxv = maxv || Number.MAX_VALUE; 
     
        var checked = 0; 
        var groups = document.getElementsByName(inputObj.name); 
         
        for(var i=0;i<groups.length;i++) { 
            if(groups[i].checked) checked++; 
             
        } 
        return minv <= checked && checked <= maxv; 
    } 
     
    this.filter = function (inputObj) { 
        var value = inputObj.value; 
        var allow = inputObj.getAttribute('allow'); 
        if (value.trim()) { 
            return new RegExp("^.+\.(?=EXT)(EXT)$".replace(/EXT/g, allow.split(/\s*,\s*/).join("|")), "gi").test(value); 
        } 
        return true; 
    } 
     
    this.isNo = function (inputObj) { 
        var value = inputObj.value; 
        var noValue = inputObj.getAttribute('noValue'); 
        return value!=noValue; 
    } 
this.checkReg = function(inputObj, reg, msg) { 
inputObj.value = inputObj.value.trim();

if (inputObj.value == '') { 
return; 
} else { 
if (!reg.test(inputObj.value)) { 
                this.addErrorMsg(inputObj.name,msg); 
            } 
} 
}

this.passed = function() { 
if (this.errMsg.length > 0) { 
FormValid.showError(this.errMsg,this.errName); 
frt = document.getElementsByName(this.errName[0])[0]; 
             
            if (frt.type!='radio' && frt.type!='checkbox') { 
                frt.focus(); 
            } 
return false; 
} else { 
return true; 
} 
}

this.addErrorMsg = function(name,str) { 
this.errMsg.push(str); 
        this.errName.push(name); 
} 
     
this.addAllName = function(name) { 
        FormValid.allName.push(name); 
} 
     
} 
FormValid.allName = new Array(); 
FormValid.showError = function(errMsg) { 
    var msg = ""; 
    for (i = 0; i < errMsg.length; i++) { 
        msg += "- " + errMsg[i] + "\n"; 
    }

alert(msg); 
} 
function validator(frm) { 
    var formElements = frm.elements; 
    var fv = new FormValid(frm); 
     
    for (var i=0; i<formElements.length;i++) { 
        var validType = formElements[i].getAttribute('valid'); 
        var errorMsg = formElements[i].getAttribute('errmsg'); 
        if (validType==null) continue; 
        fv.addAllName(formElements[i].name);

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]