How can I set a custom PropertyEditorSupport.setAsText(String) for spring's form select list?
I have a spring form. The form contains a select list that is bound to an enum type. I have also added a "choose" option to the select list that isn't represented in the enum.
I have seen some threads online where the people suggest using a PropertyEditor to avoid having to modify the enum and avoid spring from throwing conversion errors between the "choose" option and the enum (the user can leave the option as choose - it's optional in some cases)
I have created a PropertyEditor and have tried it in two scenarios. If I try using it with a select list (as outlined below) the form will not load and spring will throw errors: No enum const class com.mytest.domain.Box.Choose. If I don't include my custom editor, the form loads fine and the only problem is when the form is submitted, the errors object will contain errors complaining about a failed conversion from Java.lang.String to BoxType. If I switch the form to form:input instead of form:select, then the form will load, and will only throw errors if I submit after typing in a value that is not one of the Enum values. If I put in a valid value, I can see that my BoxEditor.setAsText() is not being called. BoxEditor.getAsText() is being called when the form loads (monkey brains is the value in the input field). I'm at a loss why the get method is called, but not the set. Any help would be greatly appreciated.
I have defined an Enum:
public enum BoxType {
SMALL,MEDIUM,LARGE
}
And a Domain object:
public class BoxRequest {
private BoxType box;
public BoxType getBox() {
return box;
}
public void setBox(BoxType b) {
this.box = b;
}
}
I have created a jsp using jstl and spring's form tagilb
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://www.springframework.org/tags" prefix="s" %>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %>
<html>
<head>
<title>Box Form</title>
</head>
<body>
<form:form id="boxrequest" method="post" modelAttribute="boxrequest">
<form:label path="box">Choose a box size*</form:label>
<form:input path="box"/>
<!-- really want the form to use this once I get it working
<form:select multiple="single" path="box">
<form:option value="Choose"/>
<form:options/>
</form:select>
-->
</form:form>
</body>
</html>
My PropertyEditor
public class BoxTypeEditor extends PropertyEditorSupport {
@Override
public void setAsText(String s) {
System.out.println("This output is never printed :( ");
if(StringUtils.hasText(s))
开发者_运维问答 setValue(Enum.valueOf(BoxType.class, s));
else
setValue(null);
}
@Override
public String getAsText() {
System.out.println("this output shows when the form loads");
if(getValue() == null) {
return "monkeybrains";
}
BoxType b = (BoxType) getValue();
return b.toString();
}
}
加载中,请稍侯......
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