我有一个从routeParam或指令属性或任何其他属性中获得的字符串,我想基于此在作用域上创建一个变量。所以:
routeParam
$scope.<the_string> = "something".
但是,如果字符串包含一个或多个点,我想将其拆分并实际上“向下钻取”到作用域中。所以'foo.bar'应该成为$scope.foo.bar。这意味着简单版本不起作用!
'foo.bar'
$scope.foo.bar
// This will not work as assigning variables like this will not "drill down" // It will assign to a variables named the exact string, dots and all. var the_string = 'life.meaning'; $scope[the_string] = 42; console.log($scope.life.meaning); // <-- Nope! This is undefined. console.log($scope['life.meaning']); // <-- It is in here instead!
在读取基于字符串的变量时,您可以通过做来获得这种行为$scope.$eval(the_string),但是在分配值时如何实现呢?
$scope.$eval(the_string)
我发现的解决方案是使用$ parse。
“将Angular表达式转换为函数。”
如果有人有更好的答案,请为该问题添加新答案!
这是示例:
var the_string = 'life.meaning'; // Get the model var model = $parse(the_string); // Assigns a value to it model.assign($scope, 42); // Apply it to the scope // $scope.$apply(); <- According to comments, this is no longer needed console.log($scope.life.meaning); // logs 42