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---
title: Using Grid With A Container
order: 31
layout: page
---
[[using-grid-with-a-container]]
Using Grid with a Container
---------------------------
Grid lazy-loads data from a `Container` instance. There are different
container implementations that e.g. fetch data from a database or use a
list of Java objects. Assuming you already have code that initializes a
`Container`, this is all that is needed for showing a Grid with the data
from your container.
[source,java]
....
import com.vaadin.server.VaadinRequest;
import com.vaadin.ui.Grid;
import com.vaadin.ui.UI;
public class UsingGridWithAContainer extends UI {
@Override
protected void init(VaadinRequest request) {
Grid grid = new Grid();
grid.setContainerDataSource(GridExampleHelper.createContainer());
setContent(grid);
}
}
....
The container in this example contains three properties; name, count and
amount. You can configure the columns in Grid using the property ids to
do things like setting the column caption, removing a column or changing
the order of the visible columns.
[source,java]
....
protected void init(VaadinRequest request) {
Grid grid = new Grid();
grid.setContainerDataSource(GridExampleHelper.createContainer());
grid.getColumn("name").setHeaderCaption("Bean name");
grid.removeColumn("count");
grid.setColumnOrder("name", "amount");
setContent(grid);
}
....
This is really all that is needed to get started with Grid.
For reference, this is how the example container is implemented.
[source,java]
....
public class GridExampleBean {
private String name;
private int count;
private double amount;
public GridExampleBean() {
}
public GridExampleBean(String name, int count, double amount) {
this.name = name;
this.count = count;
this.amount = amount;
}
public String getName() {
return name;
}
public int getCount() {
return count;
}
public double getAmount() {
return amount;
}
public void setName(String name) {
this.name = name;
}
public void setCount(int count) {
this.count = count;
}
public void setAmount(double amount) {
this.amount = amount;
}
}
....
[source,java]
....
import com.vaadin.data.util.BeanItemContainer;
public class GridExampleHelper {
public static BeanItemContainer<GridExampleBean> createContainer() {
BeanItemContainer<GridExampleBean> container = new BeanItemContainer<GridExampleBean>(
GridExampleBean.class);
for (int i = 0; i < 1000; i++) {
container.addItem(new GridExampleBean("Bean " + i, i * i, i / 10d));
}
return container;
}
}
....
|
