问题描述
在Validator组件上,我需要评估哪个文本字段出现错误,我找到了Isvalid()方法,但对我的porpuse无效,因为我不知道哪个值出现错误。
我怎么知道哪个约束和组件无效?,
The
boolean isValid(Component cmp)
不公开。
致谢
解决方法
我不确定您是否使用正确的Validator
,因为您未提供代码。但是,下面的代码应该可以帮助您入门:
使用单个验证器进行验证:
import com.codename1.ui.validation.LengthConstraint;
import com.codename1.ui.validation.RegexConstraint;
import com.codename1.ui.validation.Validator;
.
.
.
Validator val = new Validator();
val.setValidationFailureHighlightMode(Validator.HighlightMode.UIID);
val.addConstraint(emailField,RegexConstraint.validEmail())
.addConstraint(passwordField,new LengthConstraint(6));
if (val.isValid()) {
System.out.println("All validated fields pass the constraints");
} else {
// show dialog here
}
使用单个验证器进行验证:
import com.codename1.ui.validation.LengthConstraint;
import com.codename1.ui.validation.RegexConstraint;
import com.codename1.ui.validation.Validator;
.
.
.
Validator valEmail = new Validator();
valEmail.setValidationFailureHighlightMode(Validator.HighlightMode.UIID);
valEmail.addConstraint(emailField,RegexConstraint.validEmail());
if (valEmail.isValid()) {
System.out.println("Email field passes the constraint");
} else {
// show dialog here
}
Validator valPassword = new Validator();
valPassword.setValidationFailureHighlightMode(Validator.HighlightMode.UIID);
valPassword.addConstraint(passwordField,new LengthConstraint(6));
if (valPassword.isValid()) {
System.out.println("Password field passes the constraint");
} else {
// show dialog here
}
除上述内容外,我还建议使用TextComponent,因为它将在每个组件下方无缝显示错误消息,而无需对话框。
作为奖励,您甚至可以禁用“提交”按钮,直到所有经过验证的字段均有效:
import com.codename1.ui.validation.LengthConstraint;
import com.codename1.ui.validation.RegexConstraint;
import com.codename1.ui.validation.Validator;
import com.codename1.ui.*;
.
.
.
TextComponent email = new TextComponent().constraint(TextArea.EMAILADDR)
.labelAndHint("Email").focusAnimation(false);
email.setName("email");
TextComponent password = new TextComponentPassword()
.labelAndHint("Password").focusAnimation(false);
password.setName("password");
Button submit = new Button("Submit");
Validator val = new Validator();
val.setValidationFailureHighlightMode(Validator.HighlightMode.UIID);
val.addSubmitButtons(submit)
.addConstraint(email,RegexConstraint.validEmail())
.addConstraint(password,new LengthConstraint(6));