Vaadin Web应用开发教程(16):UI组件-Checkbox

上一篇：http://www.zzzyk.com/kf/201208/146780.html

Checkbox 的状态可以为checked和unchecked. 其值可以通过getValue, setValue 来操作。基本用法如下

[java]
// A check box with default state (not checked, false).  
final CheckBox checkbox1 = new CheckBox("My CheckBox"); 
main.addComponent(checkbox1); 
 
// Another check box with explicitly set checked state.  
final CheckBox checkbox2 = new CheckBox("Checked CheckBox"); 
checkbox2.setValue(true); 
main.addComponent(checkbox2); 
 
// Make some application logic. We use anonymous listener  
// classes here. The above references were defined as final  
// to allow accessing them from inside anonymous classes.  
checkbox1.addListener(new ValueChangeListener() { 
    public void valueChange(ValueChangeEvent event) { 
        // Copy the value to the other checkbox.  
        checkbox2.setValue(checkbox1.getValue()); 
    } 
}); 
checkbox2.addListener(new ValueChangeListener() { 
    public void valueChange(ValueChangeEvent event) { 
        // Copy the value to the other checkbox.  
        checkbox1.setValue(checkbox2.getValue()); 
    } 
}); 
checkbox1.setImmediate(true); 
checkbox2.setImmediate(true); 

// A check box with default state (not checked, false).
final CheckBox checkbox1 = new CheckBox("My CheckBox");
main.addComponent(checkbox1);

// Another check box with explicitly set checked state.
final CheckBox checkbox2 = new CheckBox("Checked CheckBox");
checkbox2.setValue(true);
main.addComponent(checkbox2);

// Make some application logic. We use anonymous listener
// classes here. The above references were defined as final
// to allow accessing them from inside anonymous classes.
checkbox1.addListener(new ValueChangeListener() {
    public void valueChange(ValueChangeEvent event) {
        // Copy the value to the other checkbox.
        checkbox2.setValue(checkbox1.getValue());
    }
});
checkbox2.addListener(new ValueChangeListener() {
    public void valueChange(ValueChangeEvent event) {
        // Copy the value to the other checkbox.
        checkbox1.setValue(checkbox2.getValue());
    }
});
checkbox1.setImmediate(true);
checkbox2.setImmediate(true);

Checkbox除了单独使用之外，还可以应用到OptionGroup 和Tabel中，具体参见后续文章。

作者：mapdigit
 

 

补充：Web开发 , 其他 ,

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