valueChangeListener is invoked on submit without changing options in selectOneMenu
In my page I have selectonemenu and I have noticed that when I click the pagination of datatable, valueChangeListener method is getting invoked without actually changing values or options in selectonemenu.
How is this happening and how could I prevent this from happening as I need to invoke valueChangeListener method only if user changes values in selectonemenu.
Thanks and appreciate any help.
Regards
Here is my code for selectonemenu
Update1
<ice:selectOneMenu value="#{list.selectedItem}"
partialSubmit="true" valueChangeListener="#{list.val}">
开发者_如何学JAVA <f:selectItems value="#{list.selectItems}" />
</ice:selectOneMenu>
And bean method
public void val(ValueChangeEvent event) {
logger.info("1");
selectedValue = event.getNewValue().toString();
}
Values are added like
public void loadItems(){
selectItems.add(new SelectItem("1", "One"));
selectItems.add(new SelectItem("2", "Two"));
selectItems.add(new SelectItem("3", "Three"));
selectItems.add(new SelectItem("4", "Four"));
}
And method is called as follows
public List<SelectItem> getSelectItems() {
if (selectItems == null) {
loadItems;
}
return selectItems;
}
The JSF valueChangeListener
is in no way related to the client-side events. It is a server-side event which will be invoked when the submitted value differs from the initial value.
The first item of your list has a value of 1
, so when the user doesn't change the dropdown, the submitted value will be 1
. If you don't want the valueChangeListener
to be invoked, then you need to ensure that the initial value also equals to 1
. That is the value behind #{list.selectedItem}"
. Initialize it to the same value as the first item during bean's construction/initialization.
this.selectedItem = "1";
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