Question

如何过滤让输入框 只输入字母和数字

Answer 1

如何过滤让输入框 只输入字母和数字
1. 实现
UITextFieldDelegate 协议。

2. 在头文件中，定义如下变量：

//限制用户只能输入字母和数字
#define kAlphaNum @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"

3. 在实现文件中：

将 textFiled对象的delegate设置为self:

m_accountField = [[UITextField alloc] initWithFrame:CGRectMake(89,26, 243, 33)];
m_accountField.borderStyle = UITextBorderStyleNone;
m_accountField.font = fieldFont;
m_accountField.delegate = self;

[cpp] view plaincopy
//UITextFieldDelegate
- (BOOL)textFieldShouldReturn:(UITextField *)textField;
{
//用户结束输入
[textField resignFirstResponder];

return YES;
}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string // return NO to not change text
{
NSCharacterSet *cs;
cs = [[NSCharacterSet characterSetWithCharactersInString:kAlphaNum] invertedSet];
NSString *filtered =
[[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
BOOL basic = [string isEqualToString:filtered];
return basic;
}

Answer 2

<input onkeyup="value=value.replace(/[^\w\.\/]/ig,'')">