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Posted to users@wicket.apache.org by vimal kumar <vi...@yahoo.com> on 2012/07/22 19:12:57 UTC
DropDownChoice Default Value
Hi All,
I have searched and wasted much of my time figuring out the default Value for DropDownChoice for Object as dropdown but couldn't find the solution. For "String" dropdown i was able to make it work but somehow for object it is not working.
Below is the Simple example that i have been trying, DropDownChoicePage.html and DropDownChoicePage.java files.
Can someone please help me that what am i missing into "DropDownChoicePage.java" class that is not setting the Drop Down Default value?
----------------------------------------
DropDownChoicePage.html
<html xmlns="http://www.w3.org/1999/xhtml"><head> <title>DropDown Example</title></head><body> Select your favorite Language <select wicket:id="languageDropDown"></select> </body></html>
---------------------------------------------------------------
DropDownChoicePage.java
public class DropDownChoicePage extends WebPage {
public class KeyValue {
private String key; private String value;
public KeyValue(String key, String value) { this.key = key; this.value = value; }
public String getKey() { return key; }
public String getValue() { return value; }
public void setKey(String key) { this.key = key; }
public void setValue(String value) { this.value = value; }
@Override public String toString() { return getKey(); } }
private static final long serialVersionUID = 2304448232406333188L;
private KeyValue defaultValue = new KeyValue("JAVA", "Java");
/** * Constructor */ public DropDownChoicePage() {
List<KeyValue> keyValues = new ArrayList<DropDownChoicePage.KeyValue>(); keyValues.add(new KeyValue("PHP", "php")); keyValues.add(new KeyValue("JAVA", "Java")); keyValues.add(new KeyValue("DOT_NET", "Dot Net"));
DropDownChoice<KeyValue> dropDownChoice = new DropDownChoice<KeyValue>( "languageDropDown", new PropertyModel<KeyValue>(this, "defaultValue"), keyValues, new ChoiceRenderer<KeyValue>("key", "value")); add(dropDownChoice);
}
public KeyValue getDefaultValue() { return defaultValue; }
public void setDefaultValue(KeyValue defaultValue) { this.defaultValue = defaultValue; }
}
Thanks, Vimal.
Re: DropDownChoice Default Value
Posted by David Hosier <ho...@gmail.com>.
Aww, crap. I see it was already answered in a different thread….or something that showed up under a different thread in my mail reader at least. Sorry for the noise.
On Monday, July 23, 2012 at 11:46 PM, David Hosier wrote:
> I think it's likely because your KeyValue class does not implement equals. Your defaultValue has its own new instance of KeyValue that contains the key JAVA and the value java. Your defaultValue instance and what you think is the same instance in your list are not the same unless you correctly implement equals() to identify them as the same. So you are telling the dropdown that it should select something that it does not have in the list. Also, and this may just be semantics, but it's probably inappropriate to call that thing a default value since the dropdown will update the defaultValue value with whatever you select in the dropdown (i.e. that defaultValue will only be the default value until you change the selected value in the dropdown). So it's probably more appropriately named selectedValue.
>
> -David
>
>
> On Sunday, July 22, 2012 at 10:12 AM, vimal kumar wrote:
>
> > Hi All,
> > I have searched and wasted much of my time figuring out the default Value for DropDownChoice for Object as dropdown but couldn't find the solution. For "String" dropdown i was able to make it work but somehow for object it is not working.
> > Below is the Simple example that i have been trying, DropDownChoicePage.html and DropDownChoicePage.java files.
> > Can someone please help me that what am i missing into "DropDownChoicePage.java" class that is not setting the Drop Down Default value?
> > ----------------------------------------
> > DropDownChoicePage.html
> > <html xmlns="http://www.w3.org/1999/xhtml"><head> <title>DropDown Example</title></head><body> Select your favorite Language <select wicket:id="languageDropDown"></select> </body></html>
> > ---------------------------------------------------------------
> > DropDownChoicePage.java
> > public class DropDownChoicePage extends WebPage {
> > public class KeyValue {
> > private String key; private String value;
> > public KeyValue(String key, String value) { this.key = key; this.value = value; }
> > public String getKey() { return key; }
> > public String getValue() { return value; }
> > public void setKey(String key) { this.key = key; }
> > public void setValue(String value) { this.value = value; }
> > @Override public String toString() { return getKey(); } }
> > private static final long serialVersionUID = 2304448232406333188L;
> > private KeyValue defaultValue = new KeyValue("JAVA", "Java");
> > /** * Constructor */ public DropDownChoicePage() {
> > List<KeyValue> keyValues = new ArrayList<DropDownChoicePage.KeyValue>(); keyValues.add(new KeyValue("PHP", "php")); keyValues.add(new KeyValue("JAVA", "Java")); keyValues.add(new KeyValue("DOT_NET", "Dot Net"));
> > DropDownChoice<KeyValue> dropDownChoice = new DropDownChoice<KeyValue>( "languageDropDown", new PropertyModel<KeyValue>(this, "defaultValue"), keyValues, new ChoiceRenderer<KeyValue>("key", "value")); add(dropDownChoice);
> > }
> > public KeyValue getDefaultValue() { return defaultValue; }
> > public void setDefaultValue(KeyValue defaultValue) { this.defaultValue = defaultValue; }
> > }
> > Thanks, Vimal.
>
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Re: DropDownChoice Default Value
Posted by David Hosier <ho...@gmail.com>.
I think it's likely because your KeyValue class does not implement equals. Your defaultValue has its own new instance of KeyValue that contains the key JAVA and the value java. Your defaultValue instance and what you think is the same instance in your list are not the same unless you correctly implement equals() to identify them as the same. So you are telling the dropdown that it should select something that it does not have in the list. Also, and this may just be semantics, but it's probably inappropriate to call that thing a default value since the dropdown will update the defaultValue value with whatever you select in the dropdown (i.e. that defaultValue will only be the default value until you change the selected value in the dropdown). So it's probably more appropriately named selectedValue.
-David
On Sunday, July 22, 2012 at 10:12 AM, vimal kumar wrote:
> Hi All,
> I have searched and wasted much of my time figuring out the default Value for DropDownChoice for Object as dropdown but couldn't find the solution. For "String" dropdown i was able to make it work but somehow for object it is not working.
> Below is the Simple example that i have been trying, DropDownChoicePage.html and DropDownChoicePage.java files.
> Can someone please help me that what am i missing into "DropDownChoicePage.java" class that is not setting the Drop Down Default value?
> ----------------------------------------
> DropDownChoicePage.html
> <html xmlns="http://www.w3.org/1999/xhtml"><head> <title>DropDown Example</title></head><body> Select your favorite Language <select wicket:id="languageDropDown"></select> </body></html>
> ---------------------------------------------------------------
> DropDownChoicePage.java
> public class DropDownChoicePage extends WebPage {
> public class KeyValue {
> private String key; private String value;
> public KeyValue(String key, String value) { this.key = key; this.value = value; }
> public String getKey() { return key; }
> public String getValue() { return value; }
> public void setKey(String key) { this.key = key; }
> public void setValue(String value) { this.value = value; }
> @Override public String toString() { return getKey(); } }
> private static final long serialVersionUID = 2304448232406333188L;
> private KeyValue defaultValue = new KeyValue("JAVA", "Java");
> /** * Constructor */ public DropDownChoicePage() {
> List<KeyValue> keyValues = new ArrayList<DropDownChoicePage.KeyValue>(); keyValues.add(new KeyValue("PHP", "php")); keyValues.add(new KeyValue("JAVA", "Java")); keyValues.add(new KeyValue("DOT_NET", "Dot Net"));
> DropDownChoice<KeyValue> dropDownChoice = new DropDownChoice<KeyValue>( "languageDropDown", new PropertyModel<KeyValue>(this, "defaultValue"), keyValues, new ChoiceRenderer<KeyValue>("key", "value")); add(dropDownChoice);
> }
> public KeyValue getDefaultValue() { return defaultValue; }
> public void setDefaultValue(KeyValue defaultValue) { this.defaultValue = defaultValue; }
> }
> Thanks, Vimal.
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