AngularJs에서 동적 범위 변수 설정-범위.

AngularJs에서 동적 범위 변수 설정-범위.

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나는 routeParam지시어 속성 등에서 얻은 문자열을 가지고 있으며 이것을 기반으로 범위에 변수를 만들고 싶습니다. 그래서:

$scope.<the_string> = "something".

그러나 문자열에 하나 이상의 점이 포함 된 경우이를 분할하고 실제로 범위로 "드릴 다운"하고 싶습니다. 그래서 'foo.bar'이되어야 $scope.foo.bar. 이것은 단순 버전이 작동하지 않음을 의미합니다!

// 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!

문자열을 기반으로 변수를 읽을 때를 수행하여이 동작을 얻을 수 $scope.$eval(the_string)있지만 값을 할당 할 때 어떻게 수행합니까?

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내가 찾은 해결책은 $ parse 를 사용하는 것 입니다.

"Angular 표현식을 함수로 변환합니다."

더 나은 사람이 있다면 질문에 새로운 답변을 추가하십시오!

다음은 그 예입니다.

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

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Using Erik's answer, as a starting point. I found a simpler solution that worked for me.

In my ng-click function I have:

var the_string = 'lifeMeaning';
if ($scope[the_string] === undefined) {
   //Valid in my application for first usage
   $scope[the_string] = true;
} else {
   $scope[the_string] = !$scope[the_string];
}
//$scope.$apply

I've tested it with and without $scope.$apply. Works correctly without it!

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Create Dynamic angular variables from results

angular.forEach(results, function (value, key) {          
  if (key != null) {                       
    $parse(key).assign($scope, value);                                
  }          
});

ps. don't forget to pass in the $parse attribute into your controller's function

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If you are ok with using Lodash, you can do the thing you wanted in one line using _.set():

_.set(object, path, value) Sets the property value of path on object. If a portion of path does not exist it’s created.

https://lodash.com/docs#set

So your example would simply be: _.set($scope, the_string, something);

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Just to add into alread given answers, the following worked for me:

HTML:

<div id="div{{$index+1}}" data-ng-show="val{{$index}}">

Where $index is the loop index.

Javascript (where value is the passed parameter to the function and it will be the value of $index, current loop index):

var variable = "val"+value;
if ($scope[variable] === undefined)
{
    $scope[variable] = true;
}else {
    $scope[variable] = !$scope[variable];
}

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Please keep in mind: this is just a JavaScript thing and has nothing to do with Angular JS. So don't be confused about the magical '$' sign ;)

The main problem is that this is an hierarchical structure.

console.log($scope.life.meaning);  // <-- Nope! This is undefined.
=> a.b.c

This is undefined because "$scope.life" is not existing but the term above want to solve "meaning".

A solution should be

var the_string = 'lifeMeaning';
$scope[the_string] = 42;
console.log($scope.lifeMeaning);
console.log($scope['lifeMeaning']);

or with a little more efford.

var the_string_level_one = 'life';
var the_string_level_two = the_string_level_one + '.meaning';
$scope[the_string_level_two ] = 42;
console.log($scope.life.meaning);
console.log($scope['the_string_level_two ']);

Since you can access a structural objecte with

var a = {};
a.b = "ab";
console.log(a.b === a['b']);

There are several good tutorials about this which guide you well through the fun with JavaScript.

There is something about the

$scope.$apply();
do...somthing...bla...bla

Go and search the web for 'angular $apply' and you will find information about the $apply function. And you should use is wisely more this way (if you are not alreay with a $apply phase).

$scope.$apply(function (){
    do...somthing...bla...bla
})

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If you are using Lodash library below is the way to set a dynamic variable in the angular scope.

To set the value in the angular scope.

_.set($scope, the_string, 'life.meaning')

To get the value from the angular scope.

_.get($scope, 'life.meaning')

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If you were trying to do what I imagine you were trying to do, then you only have to treat scope like a regular JS object.

This is what I use for an API success response for JSON data array...

function(data){

    $scope.subjects = [];

    $.each(data, function(i,subject){
        //Store array of data types
        $scope.subjects.push(subject.name);

        //Split data in to arrays
        $scope[subject.name] = subject.data;
    });
}

Now {{subjects}} will return an array of data subject names, and in my example there would be a scope attribute for {{jobs}}, {{customers}}, {{staff}}, etc. from $scope.jobs, $scope.customers, $scope.staff

참고URL : https://stackoverflow.com/questions/18875486/setting-dynamic-scope-variables-in-angularjs-scope-some-string