使用Nativescript网格视图查找Griview中的按钮或标签
我使用GridView Nativescript来排列UI,我想动态地将css设置为特定的按钮或标签。当外部按钮是触发器并且我尝试使用getViewById方法但总是得到空结果时,如何找到内部标签。没有办法找到它吗使用Nativescript网格视图查找Griview中的按钮或标签,nativescript,Nativescript,我使用GridView Nativescript来排列UI,我想动态地将css设置为特定的按钮或标签。当外部按钮是触发器并且我尝试使用getViewById方法但总是得到空结果时,如何找到内部标签。没有办法找到它吗 var gridview; exports.onPageLoaded = function (args) { page = args.object; gridview = page.getViewById("gridview"); }; exports.on
var gridview;
exports.onPageLoaded = function (args) {
page = args.object;
gridview = page.getViewById("gridview");
};
exports.onSelectedIndexChanged = function(args){
var totalMatch = 0;
var btn = args.object;
var index = btn.index;
var a = gridview.getViewById("25");
btn.backgroundColor = "red";
btn.color = "white";
};
<GridLayout columns="*,1,*,1,*" rows="auto" borderWidth="1" borderColor="#DBDBDB" borderRadius = "3" >
<Button text="selectALL" index="0" tap="onSelectedIndexChanged" backgroundColor= "red" id ="btnSelectAll" color="white" borderRadius="3" />
<Button text="UnselectAll" index="1" col="2" tap="onSelectedIndexChanged" backgroundColor= "white" id ="btnUnSelectAll" borderRadius = "3" />
<Border col="1" borderWidth="1" borderColor="#DBDBDB" />
<Border col="3" borderWidth="1" borderColor="#DBDBDB" />
</GridLayout>
<gv:GridView items="{{ items }}" verticalSpacing="3" horizontalSpacing="3" colWidth="100" rowHeight="50" padding="3" id="gridview" height="400">
<gv:GridView.itemTemplate>
<GridLayout backgroundColor="#ffffff" style="border-width:3px;border-color:#696969;border-radius:5">
<Button text="{{ Name }}" id="{{ Id }}" index="{{ Index }}" tap="onGridViewItemTap" backgroundColor= "white" color="red" style="background-size:100% 100%;background-repeat:no-repeat;background-image:url('~/images/drawable-hdpi-v4/spt_fiter_checked.png')" borderWidth="1" borderColor="#DBDBDB" borderRadius = "5"/>
</GridLayout>
</gv:GridView.itemTemplate>
</gv:GridView>
var-gridview;
exports.onPageLoaded=函数(args){
page=args.object;
gridview=page.getViewById(“gridview”);
};
exports.onSelectedIndexChanged=函数(args){
var totalMatch=0;
var btn=args.object;
var指数=btn指数;
var a=gridview.getViewById(“25”);
btn.backgroundColor=“红色”;
btn.color=“白色”;
};
根据我的理解,您要做的是:
- 按GridLayout中的按钮
- 触发
功能onSelectedIndexChanged
- 使用id=“25”访问按钮
- 修改按钮
on selectedIndexChanged
中,您可以通过设置新颜色来修改代码中的对象。由于它是可观察的,它将通知所有侦听器进行修改。在我们的例子中,是XML中的属性。
在此,我向您发送一个简单的示例:
main page.xml
<Page xmlns="http://schemas.nativescript.org/tns.xsd" loaded="onPageLoaded">
<GridLayout rows="auto,auto" >
<Button text="Click to Change Color" row="0" tap="onSelectedIndexChanged"/>
<Button text="Button" row="1" backgroundColor="{{color}}"/>
</GridLayout>
</Page>
我希望这将为您提供一些指导。您好,请检查您的代码,以便更清楚地了解您尝试执行的操作。首先-我看不出XML中在哪里使用了
onSelectedIndexChanged
。第二,你使用的是.ya,我使用的是nativescript网格视图,我真的更新了代码。抱歉显示不清楚的信息
var observable = require("data/observable");
var json={color:'red'};
var changeCss = new observable.Observable(json);
var gridview;
exports.onPageLoaded = function (args) {
page = args.object;
page.bindingContext=changeCss;
};
exports.onSelectedIndexChanged = function(args){
changeCss.set("color","blue");
};