js表单校验(必录、日期数字校验)

//校验表单必录,每个必录的表单需要增加一个属性required='true'

function val(id){    var selected = "#"+id+" :input[required='true']";    var fields = $(selected);    var flag = true;    for(var i=0; i<fields.length; i++){        if(fields[i].value.length == 0){            flag = false;            fields.eq(i).css("border-color","red");        }    }        return flag;}

//校验输入字数

function textCounter(field, maxlimit) {    var trimed = field.value.replace(/^\s+|\s+$/g, '');    if (trimed.length > maxlimit) {        trimed =  trimed.substring(0, maxlimit);        field.value = trimed;    }}

//短日期，形如 (2003-12-05)

function isDate(field){    var str = field.value;    var r = str.match(/^(\d{1,4})(-)(\d{1,2})(-)(\d{1,2})$/);    if(r==null){        alert("输入的数字不合法！");        field.value = "";        return false;    }    if(r[3]>12 || r[5] > 31){        alert("输入的数字不合法！");        field.value = "";        return false;    }    return true;}

//数字

function isNumber(field){    var str = field.value;    var r = str.match(/^(0|[1-9]\d*)$/);    if(r==null){        alert("输入的数字不合法！");        field.value = "";        return false;    }    return true;}

//校验实数

function isBigDecimal(field,n){    var str = field.value;    var reg = "";    if(n == null || n == ""){        reg = "^[0-9]+(.[0-9]+)?)";    }else{        reg = "^[0-9]+(.[0-9]{1,"+n+"})?$";    }    var r = str.match(new RegExp(reg));    if(r==null){        alert("输入的数字不合法！");        field.value = "";        return false;    }    return true;}