AngularJS服务功能执行顺序

Question

I'm new to AngularJS. I created a service to retrieve a file using $http.get, but I can't figure out how to control when the service function is executed.

My controller's function is injected with the service.

When the page first loads, the service function is invoked first. Instead, I want the service function to be invoked after clicking a button.

Or maybe I shouldn't use a service function?

 var app = angular.module("app", []); app.controller("myCtrl", function($scope, $http, myService) { $scope.searchValues = function () { $scope.value = "search.json"; myService.setValue($scope.value); console.log(" in searchValues " + $scope.value); }; }); app.service("myService", function($http, $q) { var deferred = $q.defer(); var value ; this.setValue = function(valueSelected) { console.log("in service: " + valueSelected); value = valueSelected; }; $http.get('http://juubaker.github.io/' + value).then(function(data) { console.log("in service 2: " + value); deferred.resolve(data); }); this.getValue = function() { return deferred.promise; }; }); 

Thanks

Answer 1

Your service looks totally fine. Just don't call your myService.setValue method in your controller immediately like that. Instead, create a method that you run via ng-click

app.controller("myCtrl", function($scope, $http,  myService) {
  $scope.updateValue = function(){
    myService.setValue($scope.value);
  }
});

And your template:

<input type="text" ng-model="value" />
<a ng-click="updateValue()">Save Value</a>

The logic inside your controller method is run immediately upon initialization of that controller, which is why you're running into this issue.