在键入事件时跳过对Primefaces Inputtext的验证，但在提交时进行验证 [英] Skip validation of Primefaces Inputtext on keyup event but validate on submit
问题描述
我对InputText有两个要求:
I have two requirements for my InputText:
- p:inputText的值应立即在h:outputText中通过keyup-event显示在屏幕上
- 该值在数据库中应该是唯一的
我正在使用Primefaces 4.0，带有Glassfish 4和Java 7的JSF 2.2
I'm using Primefaces 4.0, JSF 2.2 with Glassfish 4 and Java 7
此刻我的代码是这样的
Example.xhtml
Example.xhtml
<h:form>
<p:inputText id="value" value="#{myBean.value}" >
<p:ajax event="keyup" update="example" process="@this" />
<f:validator binding="#{uniqueValueValidator}" />
</p:inputText>
<h:outputText id="example" value="#{myBean.value}">
<p:commandButton value="Save" action="#{myBean.saveValue}"/>
</form>
MyBean.java
MyBean.java
@Named
@RequestScoped
public class MyBean {
@Inject
private DBService service;
private String value;
//getter, setter
public String saveValue() {
service.saveValue(value);
return "showall";
}
}
UniqueValueValidator.java
UniqueValueValidator.java
@Named
public class UniqueValueValidator implements Validator {
@Inject
private DBService service;
@Override
public void validate(FacesContext context, UIComponent component, Object value)
throws ValidatorException {
if(service.isValueNotUnique(value.toString()) {
// throw ValidatorException
}
}
}
我现在的问题是，在每个keyup事件中，该值都会被验证并调用数据库.但是我只想在提交表单时验证值.
My problem is now, that on every keyup-event the value is validated and a call to the database is made. But I want to validate the value only when the form is submitted.
我的第一个解决方案是将验证转移到saveValue方法中.
My first solution was to move the validation into the saveValue method.
public String saveValue() {
if(service.isValueNotUnique(value) {
// add a FacesMessage
return null;
} else {
service.saveValue(value);
return "showall";
}
}
但是在这里，我认为将验证代码和逻辑代码混合在一种方法中并不是一种好习惯.
But here I think it is not good practice to mix validation code and logic code in one method.
所以我希望你对我有更好的解决方案;)
So I hope you have a nicer solution for me ;)
推荐答案
问题出在inputText组件内部的ajax标记中:
The issue lies in the ajax tag inside the inputText component:
<p:ajax event="keyup" update="example" process="@this" />
这意味着您将在每个keyup事件上提交组件.这样，每次都会调用验证程序.
This means that you are submitting the component on each keyup event. And the validator will be called each time consequently.
一种可行的解决方法是，按照用于验证多个组件的相同技术，将验证器移动到另一个组件:
A possible workaround is to move the validator to another component, following the same technique used for validating multiple components:
在facelets页面中，添加使用uniqueValueValidator的inputHidden:
In the facelets page add an inputHidden that uses uniqueValueValidator:
<h:form id="formId" >
<p:inputText id="value" value="#{myBean.value}" >
<p:ajax event="keyup" update="example" process="@this" />
</p:inputText>
<h:inputHidden id="hidden">
<f:validator validatorId="uniqueValueValidator" />
</h:inputHidden>
<p:message for="hidden" />
<p:commandButton value="Save" action="#{myBean.saveValue}" process="@form" update="@form"/>
</h:form>
UniqueValueValidator :
@Named
@FacesValidator("uniqueValueValidator")
public class UniqueValueValidator implements Validator {
@Inject
private DBService service;
@Override
public void validate(FacesContext context, UIComponent component, Object obj) {
Object inputValue = ((UIInput) context.getViewRoot().findComponent("formId:value")).getSubmittedValue();
if(service.isValueNotUnique((String) inputValue) {
// throw ValidatorException
}
}
}
}
这种方法，就像您的方法一样，意味着在每个keyup事件中输入内容的往返客户端-服务器-客户端.如果不必要，您可以使用其他答案中所述的javascript方法来避免这种情况.
This approach, like yours, implies a round-trip client-server-client of the inputed content on each keyup event. If this is not necessary, you can avoid it with a javascript approach as explained in the other answer.
链接
- The BalusC Code: Validator for multiple components
- jsf validate two fields in one time
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