0

我正在尝试使用 html 从 html 获取用户查询ng-click。我想使用从 ng-click 获取的值进行 https 调用。我可以在Alert--1中看到数据,但在Alert--2中我得到undefined. 在互联网上,我读到使用服务传递值是最佳实践。如果我错了,请纠正我。

我的控制器

mainApp.controller('searchController',function($scope,searchString){

  $scope.getQuery = function(userq)  // its ng-click="getQuery(userq)" on Search button
  {
    $scope.userq=userq;
    alert('Alert--1'+userq);  // its working fine
    searchString.setSearchString(userq);
  };
});

//====================

mainApp.controller('fetchQueryResultController',function($scope,searchString){
   var searchStr = searchString.getSearchString();
   alert('Alert--2--'+searchStr);   //   Undefined
  // Later I'll use this value to fetch data from Watson search(Django) using $https call
});

我的服务:

mainApp.factory('searchString', function () {
    var qVal ;

    return {
        setSearchString:function (query) {
            qVal = query;
        },
        getSearchString:function () {
            return qVal;
        }
    };
});

路由:

.when('/search', {
     templateUrl: "../static/views/seachResult.html",
     controller: "fetchQueryResultController"
  })

有没有更简单的方法?

4

3 回答 3

1

此警报未定义

var searchStr = searchString.getSearchString();
 alert('Alert--2'+searchStr);  

因为qVal还没有设置

qValgetQuery被调用但该时间alert2已经执行时设置

于 2015-11-01T04:40:04.860 回答
1

使用服务是可以的。看看这个,对于初学者来说是很清楚的:

https://egghead.io/lessons/angularjs-sharing-data-between-controllers

alert('Alert--2'+searchStr); 显示未定义,因为它显然之前正在执行$scope.getQuery。控制器的初始化在ng-init计算表达式之前完成。

在您的情况下,我认为最好在设置数据时触发事件,以便通知第二个控制器。这是用$onand完成的$emit

这是您的示例的一个笨拙者:http ://plnkr.co/edit/97mVwbWmoOH3F7m8wbN0?p=preview

var app = angular.module('plunker', []);

app.controller('searchController',function($scope,searchString){

  $scope.searchText;

  $scope.getQuery = function(userq)  // its ng-click="getQuery(userq)" on Search button
  {
    $scope.userq=userq;
    alert('Alert--1'+userq);  // its working fine
    searchString.setSearchString(userq, $scope);
  };
});

//====================

app.controller('fetchQueryResultController',function($scope, $rootScope, searchString){
   var searchStr = searchString.getSearchString;

   $scope.getData = function(){
     searchStr = searchString.getSearchString();
     alert('Alert--2--'+ searchStr); 
   }

   $rootScope.$on('dataModified', function(){
     $scope.getData();
   });

});

//====================

app.factory('searchString', function ($rootScope) {
    var qVal ;

    return {
        setSearchString:function (query) {
            qVal = query;
            $rootScope.$emit('dataModified');
        },
        getSearchString:function () {
            return qVal;
        }
    };
});
于 2015-11-01T04:42:15.710 回答
0

一个简单的解决方案是让您的工厂返回一个对象并让您的控制器使用对同一对象的引用:

JS:

// declare the app with no dependencies
var myApp = angular.module('myApp', []);


myApp.factory('searchString', function() {
  var qVal;

  return {
    setSearchString: function(query) {
      qVal = query;
    },
    getSearchString: function() {
      return qVal;
    }
  };
});

myApp.controller('setSearchController', function($scope, searchString) {
  $scope.setQuery = function(userq) {
    $scope.userq = userq;
    searchString.setSearchString(userq);
  };
});

myApp.controller('fetchQueryResultController', function($scope, searchString) {

  $scope.getQuery = function(user) {
    alert(searchString.getSearchString());
  };

});

HTML:

<div ng-app="myApp">
    <div ng-controller="setSearchController">
      <button ng-click="setQuery('Shohel')">Set</button>
    </div>
    <hr />
    <div ng-controller="fetchQueryResultController">
      <button ng-click="getQuery()">Get</button>
    </div>
  </div>

这是类似的小提琴

于 2015-11-01T09:51:58.263 回答