我对Qooxdoo完全陌生。
我想将属性绑定到标签,如下面的代码所示,但这不起作用:(
qx.Class.define("xxx.view.XxxView",
{
extend : qx.ui.container.Composite,
properties : {
CaseID : {
check : 'String',
event : 'changeCaseID',
init : '000000000'
}
},
members : {
_CaseIDLabel : null
},
construct : function()
{
this._CaseIDLabel = new qx.ui.basic.Label("initial");
this.CaseID.bind('changeCaseID', this._CaseIDLabel, 'value');
}
}
thx 4条提示
答案 0 :(得分:1)
您不能直接访问该属性。您必须使用获取器和设置器来获取其价值。您可以改为绑定整个属性。绑定系统足够聪明,可以检测到发出的事件,提取属性值并将其应用于目标。
这是工作代码
qx.Class.define("xxx.view.XxxView", {
extend : qx.ui.container.Composite,
construct : function() {
this.base(arguments);
this._CaseIDLabel = new qx.ui.basic.Label("initial");
// containers need a layout
this.setLayout(new qx.ui.layout.Canvas());
this.add(this._CaseIDLabel);
// notice here we are binding this object's property
this.bind('CaseID', this._CaseIDLabel, 'value');
},
properties : {
CaseID : {
check : 'String',
event : "changeCaseID",
init : '000000000'
}
},
members : {
_CaseIDLabel : null
},
});
这是操场上的例子 https://tinyurl.com/rt5v8zx
答案 1 :(得分:1)
这是另一个示例,其处理方式略有不同。请参阅嵌入的注释。
qx.Class.define("xxx.view.XxxView",
{
extend : qx.ui.container.Composite,
properties : {
CaseID : {
check : 'String',
event : "changeCaseID",
init : '000000000'
}
},
members : {
_CaseIDLabel : null
},
construct : function()
{
// We need to call the superclass constructor.
// In this case, we also provide a layout for this container.
this.base(arguments, new qx.ui.layout.VBox());
// Here we instantiate a Label with initial text, but that text
// will be immediately overwritten so we'll never see it
this._CaseIDLabel = new qx.ui.basic.Label("initial");
this.add(this._CaseIDLabel);
// We can bind to our own property, as done here. Note, though,
// that this doesn't use the being-initialized value in the property
// without explicit instruction... so we then force-initialize that
// property.
this.bind('changeCaseID', this._CaseIDLabel, 'value');
this.initCaseID();
}
});
// Instantiate one of these xxxView objects, and place it on the page
var xxxView = new xxx.view.XxxView();
this.getRoot().add(xxxView, { left : 10, top : 200 } );
// Show how the property value can change later, and update the label
setTimeout(
function()
{
xxxView.setCaseID('Hello world!');
},
2000);
可以在操场上看到它:http://tinyurl.com/vml8bru