如果mainCtrl.header.Version中的条件为false，如何在字符串文本中添加ng-attr-title？
HTML
<label class="form-control" ng-attr-title="{{mainCtrl.header.Version == 0 ? 'This form has not yet been submitted for approval' : 'This form has been submitted for approval {{mainCtrl.header.Version}} times'}}">{{mainCtrl.header.Version}}</label>
语法是：
ng-attr-title="{{mainCtrl.header.Version == 0 ? 'This form has not yet been submitted for approval' : 'This form has been submitted for approval ' + mainCtrl.header.Version + ' times'}}"
ng-attr-title显示给定的字符串，因此您必须使用{{expr}}。为了测试你的表达，我建议你写<pre>{{ your expression | json }}</pre>来看看结果是什么。
你可以从JS控制器端实现它。拿一个变量title检查version是否为0然后分配你想要的标题。如果版本大于0，则将版本与标题消息连接起来。请考虑以下代码段。
<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>
<body>
<div ng-app="myApp" ng-controller="myCtrl as mainCtrl">
<label class="form-control" ng-attr-title="{{mainCtrl.title}}">
{{mainCtrl.header.Version}}
</label>
</div>
<script>
var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
var mainCtrl = this;
mainCtrl.header = {"Version":0};
if( mainCtrl.header.Version == 0 )
{
mainCtrl.title = "This form has not yet been submitted for approval";
}
else
{
mainCtrl.title = "This form has not yet been submitted for " +mainCtrl.header.Version+" approval";
}
});
</script>
</body>
</html>你可以通过调用这样的函数来做到这一点：
var app = angular.module('app', []);
app.controller('htmlTitle', ['$scope','$http', function($scope, $http){
$scope.mainCtrl = {
header: {
Version: 0
}
};
$scope.get_title = function(){
if($scope.mainCtrl.header.Version == 0){
return 'This form has not yet been submitted for approval';
}
else{
return 'This form has been submitted for approval ' + $scope.mainCtrl.header.Version + ' times';
}
}
}]);<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.7.5/angular.min.js"></script>
<div ng-app="app">
<div ng-controller="htmlTitle">
<label class="form-control" title="{{get_title()}}" >{{mainCtrl.header.Version}}</label>
</div>
</div>这是一个codepen。