Javascript 在视图中按Id选择对象

在Tianium中，如何通过id选择对象

使用钛合金，我创建了一个儿童视图。我在父视图上设置了一个事件侦听器，这样就不必为每个子视图创建一个事件侦听器。在事件侦听器中，我使用

e.source.id

确定单击了哪个子视图。我需要更改单击视图时视图的高度，还需要更改以前打开的视图的高度。（这就是显示带有下划线类型样式的活动视图的全部内容。）

我不知道如何通过id名称选择对象，以便更改其高度

//storing the id of the last clicked feed label so we can change it's height when it's no longer open
var feedSelector = 'selection_All';

selection_Type.addEventListener('click', function (e) {
Ti.API.info( ' ==== Select Destination Hit ==== '  + e.source.id);
if (e.source.id === feedSelector)   {
            //refresh the feed view
            Ti.API.info('Simulating feed refresh for...' + e.source.id);
        }
        else {
            //reducing active label height to simulatue 2px underline
            e.source.setHeight(28);

            //reset previous selected label height
            //here's the problem
            //i know how to do this in regular javascript/html
            //but I don't know how to access an object by it's id in Titanium

           //setting current label id in feedSelector so we can change it's height next time a button is clicked
           feedSelector = e.source.id;
           Ti.API.info('Changed value for feedSelector to...' + feedSelector);
}
        }
        }

        );

        var selection_All = Ti.UI.createLabel({
        id: 'selection_All',
        text: 'All',
        width: '14.9%',
        top: 0,
        center: 2,
        height: 28,
        backgroundColor: '#fff',
        textAlign: Titanium.UI.TEXT_ALIGNMENT_CENTER,
        color:'#073266',
        font:{fontFamily:'Trebuchet MS',fontSize:13}

        });

    var selection_Status = Ti.UI.createLabel({
        id: 'selection_Status',
        text: 'Status',
        width: '22%',
        top: 0,
        center: 0,
        height: 30,
        backgroundColor: '#fff',
        textAlign: Titanium.UI.TEXT_ALIGNMENT_CENTER,
        color:'#073266',
        font:{fontFamily:'Trebuchet MS',fontSize:13}
    });

    var selection_Article = Ti.UI.createLabel({
        id: 'selection_Article',
        text: 'Article',
        width: '23%',
        top: 0,
        center: 0,
        height: 30,
        backgroundColor: '#fff',
        textAlign: Titanium.UI.TEXT_ALIGNMENT_CENTER,
        color:'#073266',
        font:{fontFamily:'Trebuchet MS',fontSize:13}
    });

    var selection_Video = Ti.UI.createLabel({
        id: 'selection_Video',
        text: 'Video',
        width: '20%',
        top: 0,
        center: 0,
        height: 30,
        backgroundColor: '#fff',
        textAlign: Titanium.UI.TEXT_ALIGNMENT_CENTER,
        color:'#073266',
        font:{fontFamily:'Trebuchet MS',fontSize:13}
    });

    var selection_Audio = Ti.UI.createLabel({
        id: 'selection_Audio',
        text: 'Audio',
        width: '20%',
        top: 0,
        center: 0,
        height: 30,
        backgroundColor: '#fff',
        textAlign: Titanium.UI.TEXT_ALIGNMENT_CENTER,
        color:'#073266',
        font:{fontFamily:'Trebuchet MS',fontSize:13}
    });

    //creating selection type container and adding selection types
    selection_Type.add(selection_All);
    selection_Type.add(selection_Status);
    selection_Type.add(selection_Article);
    selection_Type.add(selection_Video);
    selection_Type.add(selection_Audio);
    selectionView.add(selection_Type);

---

Edit：我使用switch语句完成了我需要做的事情，但是如果我可以通过对象的id来获取对象，它会更干净

var feedSelector = 'selection_All';

selection_Type.addEventListener('click', function (e) {
Ti.API.info( ' ==== Select Destination Hit ==== '  + e.source.id);
if (e.source.id === feedSelector)   {
    //refresh the feed view if the feed is open and button is clicked
    //Ti.API.info('Simulating feed refresh for...' + e.source.id);
    alert('Refreshing feed');
}
else {
    //reducing active label height to simulatue 2px underline
    e.source.setHeight(28);
    switch (feedSelector)   {
        case 'selection_All':
            selection_All.setHeight(30);
            break;
        case 'selection_Status':
            selection_Status.setHeight(30);
            break;
        case 'selection_Article':
            selection_Article.setHeight(30);
            break;
        case 'selection_Video':
            selection_Video.setHeight(30);
            break;
        case 'selection_Audio':
            selection_Audio.setHeight(30);
            break;
    }

    feedSelector = e.source.id;
    Ti.API.info('Changed value for feedSelector to...' + feedSelector);
}
}

---

))

如果您使用的是Tianium Studio，只需调试click事件并检查事件对象即可。在断点停止时，转到表达式选项卡，输入事件对象并检查它。可能UI元素作为属性存在

另一种方法是：

var labelStore = {};


function createLabel(props){
   var label = Ti.UI.createLabel(props);
   labelStore[props.id] = label;

   return label;
}

function getLabelById(id){
   return labelStore[id];
}


var selection_Status = createLabel({
    id: 'selection_Status',
    ...
});

然后在上单击

var id = e.source.id;
var label = getLabelById(id);

---

..执行标签的操作

如果使用的是Tianium Studio，只需调试click事件并检查事件对象即可。在断点停止时，转到表达式选项卡，输入

e

事件对象并检查它。可能UI元素是作为一个属性存在的。我使用switch语句完成了所需的操作。这是有效的，因为视图中只有五个对象需要更改，但我仍然不知道如何通过对象的id获取对象。是否有一个与常规javascript中的

getObjectbyId（feedSelector）

类似的等价物？您可能喜欢DOM浏览器API而不是javascript。仅当您使用Alloy框架并使用XML文档时。我还没有在这样的场景中遇到过这样的客户，但您可以查看钛合金文档。

var id = e.source.id;
var label = getLabelById(id);