** 表单验证
使用说明:
在使用表单的页面填入如下script
<script language="JavaScript" type="text/javascript" src="../jslib/form.js">
</script>
<script language="JavaScript" type="text/JavaScript">
function checkForm(theForm) { //v2.0
if (!checkNotNull(theForm.name,"姓名")) return false;
if (!checkNumber(theForm.age,"年龄")) return false;
...
return true;
}
</script>
注意:checkNumber(),checkLength()等方法并不检查是否为空
<FORM name="form1" acton="..." onSubmit="return checkForm(document.form1)">
...
<input type="submit" name="Submit" value="Submit">
</FORM>
********************************/
// 是否为空,非空返回真,不非为空返回假
function isBlank(str) {
var blankFlag = true;
if (str.length == 0) return true;
for (var i = 0; i < str.length; i++) {
if ((str.charAt(i) != "") && (str.charAt(i) != " ")) {
blankFlag = false;
break;
}
}
return blankFlag;
}
function checkNotNull(theField, fieldName) {
if(isBlank(theField.value)){
alert(fieldName + "不可为空!");
theField.focus();
return false;
}
return true;
}
// 是否为数字
function checkNumber(theField, fieldName) {
var pattern = /^([0-9]|(-[0-9]))[0-9]*((\.[0-9]+)|([0-9]*))$/;
if(theField.value == "") return true;
if (!pattern.test(theField.value)) {
alert(fieldName + "必须为合法数字");
theField.focus();
theField.select();
return false;
}
return true;
}
// 是否为指定范围数字
function checkNumberRange(theField, fieldName, min, max) {
if(theField.value == "") return true;
if (!checkNumber(theField, fieldName)) return false;
if ((min != "") && (theField.value < min)) {
alert(fieldName + "不可小于" + min + "!");
theField.focus();
theField.select();
return false;
}
if ((max != "") && (theField.value > max)) {
alert(fieldName + "不可超过" + max + "!");
theField.focus();
theField.select();
return false;
}
return true;
}
// 是否为整数
function checkInteger(theField, fieldName) {
var pattern = /^(\d|(-\d))\d*$/;
if(theField.value == "") return true;
if (!pattern.test(theField.value)) {
alert(fieldName + "必须为整数!");
theField.focus();
theField.select();
return false;
}
return true;
}
// 是否为指定范围内整数
function checkIntegerRange(theField, fieldName, min, max) {
if(theField.value == "") return true;
if (!checkInteger(theField, fieldName)) return false;
if ((min != "") && (theField.value < min)) {
alert(fieldName + "不可小于" + min + "!");
theField.focus();
theField.select();
return false;
}
if ((max != "") && (theField.value > max)) {
alert(fieldName + "不可超过" + max + "!");
theField.focus();
theField.select();
return false;
}
return true;
}
// 是否为正数
function checkPositiveNumber(theField, fieldName) {
if(theField.value == "") return true;
if (theField.value.charAt(0) == '-') {
alert(fieldName + "必须为正数!");
theField.focus();
return false;
}
return true;
}
// 限制字串最大长度
function checkLength(theField, fieldName, maxLength) {
if(theField.value == "") return true;
if (theField.value.length > maxLength) {
alert(fieldName + "的字数最多为" + maxLength + "字!");
theField.select();
theField.focus();
return false;
}
return true;
}
// 限制字串长度,注意参数顺序
function checkLength2(theField, fieldName, maxLength, minLength) {
if(theField.value == "") return true;
if (theField.value.length > maxLength) {
alert(fieldName + "的字数最多为" + maxLength + "字!");
theField.focus();
return false;
}
if ((minLength != "") && (theField.value.length < minLength)) {
alert(fieldName + "的字数最少为" + minLength + "字!");
theField.focus();
return false;
}
return true;
}
// 所输入字符串是否均为合法字符
// charBag中为包含所有合法字符的字符串
function checkStrLegal(theField, fieldName, charBag) {
if(theField.value == "") return true;
for (var i = 0; i < theField.value.length; i++) {
var c = theField.value.charAt(i);
if (charBag.indexOf(c) == -1) {
alert(fieldName + "含有非法字符(" + c + ")!");
theField.focus();
return false;
}
}
return true;
}
// 所输入字符串是否均为合法字符
// charBag中为包含非法字符的字符串
function checkStrLegal2(theField, fieldName, charBag) {
if(theField.value == "") return true;
for (var i = 0; i < theField.value.length; i++) {
var c = theField.value.charAt(i);
if (charBag.indexOf(c) > -1) {
alert(fieldName + "含有非法字符(" + c +")!");
theField.focus();
return false;
}
}
return true;
}
// 电子邮件验证
function checkEmail(theField) {
var pattern = /^.+@.+\..+$/;
if(theField.value == "") return true;
if (!pattern.test(theField.value)) {
alert("请输入合法的电子邮件地址");
theField.focus();
theField.select();
return false;
}
return true;
}
// 是否为只读域(如file,text等域只接受右边按钮选择传回的结果)
function checkReadField() {
alert("请点击后面的图标进行选择");
// this.blur();
}
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