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在填写注册表单时工程师妹都会考虑到删除特殊字符和限定用户输入长度等等，下面有个不错的示例，感兴趣的朋友可以参考下
复制代码 代码如下:
/检查非法字符并检验字符长度
function checkSpeChar(obj, byteLength, title) {
var value = document.getElementById(obj).value;
value = value.replace(/(^\s*)/g, "").replace(/(\s*$)/g, "");
var ret = (/[-|;|,|\/|\(|\)|\[|\]|\}|\{|%|@|\*|!|\']/.test(value));
var arr = ["@", "#", "$", "%", "^", "&", "*", "<", ">", "/", "\\", "\'", "'", ".", ":", "?", "[", "]", ";", "-", "、", "(", ")", "_", "\"", "~", "insert", "delete", "update", "select"];
value = value.toLowerCase();
for (var i = 0; i < arr.length; i++) {
if (value.indexOf(arr[i].toLowerCase()) >= 0) {
ret = true;
}
}
if (ret == true) {
top.LSAlert("内容中含非法字符，请重新输入！");
document.getElementById(obj).value = '';
return;
}
limitLength(value, byteLength, title, obj);
}
//验证输入字符长度
function limitLength(value, byteLength, title, attribute) {
value = value.replace(/\r/g, " ").replace(/\n/g, " "); //回车换行分别替换两个空格
var newvalue = value.replace(/[^\x00-\xff]/g, "***");
var length = newvalue.length;
//当填写的字节数小于设置的字节数
if (length * 1 <= byteLength * 1) {
return;
}
var limitDate = newvalue.substr(0, byteLength);
var count = 0;
var limitvalue = "";
for (var i = 0; i < limitDate.length; i++) {
var flat = limitDate.substr(i, 1);
if (flat == "*") {
count++;
}
}
var size = 0;
var istar = newvalue.substr(byteLength * 1 - 1, 1); //校验点是否为“×”
//if 基点是×;
if (count % 3 == 0) {
size = count / 3 + (byteLength * 1 - count);
limitvalue = value.substr(0, size);
}
else if (count % 3 == 1) {
size = (count - 1) / 3 + (byteLength * 1 - count);
limitvalue = value.substr(0, size);
}
else if (count % 3 == 2) {
size = (count - 2) / 3 + (byteLength * 1 - count);
limitvalue = value.substr(0, size);
}
//top.LSAlert(title + "最大输入" + byteLength + "个字节！");
document.getElementById(attribute).value = limitvalue;
return;
}
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发表于 2013-10-16 17:29:35
