有条件的用AngularJS结合,串联和绑定值,如果属性不为空 [英] Conditional binding with AngularJS, concatenate and bind value if property is not empty
问题描述
我是新来的角,我试图将一个字符串绑定到如果该值的典范!==空。这对于一个输入工作,但我想多个文本输入框组合成一个字符串。
<输入类型=文本NG模型=data.source>
<输入类型=文本NG模型=data.medium><跨度NG秀=data.source>< H3> {{'additionToSource'+ data.source}}< / H3和GT;< / SPAN>
<跨度NG秀=data.medium>< H3> {{'additionToMedium'+ data.medium}}< / H3 GT&;
您可以简单地添加 NG-节目
或 NG-隐藏
指令到 H3
本身,如果你想隐藏整个元素。
另外,你可以使用三元的结合,以确定哪些势必:
{{富? 一些字符串'+ foo的:''}}
说明:
// foo的如果$ scope.foo是truthy(不为空)
? 一些字符串+富//绑定$字符串scope.foo置到年底
:''在一个空字符串//否则,绑定
有关您的code,这将是:
< H3> {{data.source? additionToString'+ data.source:''}}< / H3 GT&;
根据您的意见
,你也可以寻找返回与函数的绑定: 现场演示(点击进入)。
<输入NG模型=foo的>< H3 NG秀=foo的> {{巴()}}< / H3 GT&;
< H3> {{富?巴()''}}< / H3 GT&;
JavaScript的:
$ scope.foo ='';
$ scope.bar =功能(){
返回'增值'+ $ scope.foo;
};
I am new to Angular and am trying to bind a string to a model if the value !== empty. This work for one input, but I would like to combine multiple text inputs into one string.
<input type="text" ng-model="data.source">
<input type="text" ng-model="data.medium">
<span ng-show="data.source"><h3>{{'additionToSource' + data.source}}</h3></span>
<span ng-show="data.medium"><h3>{{'additionToMedium' + data.medium}}</h3>
You could simply add the ng-show
or ng-hide
directive to the h3
itself if you are wanting to hide the whole element.
Alternatively, you could use ternary in the binding to determine what is bound:
{{foo ? 'some string '+foo : ''}}
Explanation:
foo //if $scope.foo is truthy (not empty)
? 'some string '+foo //bind a string with $scope.foo concatenated to the end
: '' //otherwise, bind in an empty string
For your code, it would be:
<h3>{{data.source ? 'additionToString' + data.source : ''}}</h3>
Based on your comments, you may also be looking to return a binding with a function: Live demo (click).
<input ng-model="foo">
<h3 ng-show="foo">{{bar()}}</h3>
<h3>{{foo ? bar() : ''}}</h3>
JavaScript:
$scope.foo = '';
$scope.bar = function() {
return 'added value '+$scope.foo;
};
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