How to get only the changed rows in h:dataTable
Hi,
I am very new in jsf technology.
For our application, I need to process only the changed rows in the jsf datatable in managed bean.
User may also enter new rows.We have to consider this also.
Pls post ur suggession as soon as possible.This is urgent.This will be best if someone can post me some code snippets.
Thanks
-S
As klejs said, set the valueChangeListener attribute to each of the input fields. Have a method in your backing bean which would
1) get the index from the component id
2) get the object and the above index from ArrayList
3) check if the old Value is different from the new value. If yes, set some boolean flag in that object to true indicating that the row is modified.
Sample code below. Please feel free to add checks if you need.
public void updateDirtyFlag(ValueChangeEvent valueChangeEvent){
if(valueChangeEvent.getOldValue()==null && valueChangeEvent.getNewValue()==null){
return;
if(valueChangeEvent.getComponent().getId()==null){
return;
//Extract the index from the component id in the getId method
int idVal=getId(valueChangeEvent.getComponent().getClientId(FacesContext.getCurrentInstance()));
ArrayList dataList=getData(); // data from session or request scope
if((valueChangeEvent.getOldValue()==null && valueChangeEvent.getNewValue()!=null)
|| (valueChangeEvent.getOldValue()!=null && valueChangeEvent.getNewValue()==null)){
if(dataList!=null && idVal<dataList.size() && idVal>-1){
YourBaseValueObject pojo=(YourBaseValueObject)dataList.get(idVal);
pojo.setUpdateFlag(true);
else if(valueChangeEvent.getOldValue()!=null && valueChangeEvent.getNewValue()!=null && !valueChangeEvent.getOldValue().equals(valueChangeEvent.getNewValue())){
if(dataList!=null && idVal<dataList.size() && idVal>-1){
YourBaseValueObject pojo=(YourBaseValueObject)dataList.get(idVal);
pojo.setUpdateFlag(true);
}HTH.
Karthik
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