如何使用$http.get检索的JSON数据和承诺?
我没有考虑angular的$http.get workings,所以也许你可以帮我重新调整。我正在开发一个向导,其中每个步骤都是一个单独的html文件,步骤的顺序是一个JSON文件。我要做的是读取JSON文件,然后:如何使用$http.get检索的JSON数据和承诺?,json,angularjs,asynchronous,Json,Angularjs,Asynchronous,我没有考虑angular的$http.get workings,所以也许你可以帮我重新调整。我正在开发一个向导,其中每个步骤都是一个单独的html文件,步骤的顺序是一个JSON文件。我要做的是读取JSON文件,然后: 创建一个步骤列表作为指南 通过ng include显示步骤的内容 创建指向上一步和下一步的按钮 根据我在中阅读的内容和类似主题,我可以创建一个服务或工厂来读取JSON。这样做会创建一个promise对象,然后每当数据到达时,该对象就会被传递到要填充的行。将数据插入到绑定到视图的模型
workflow.factory('getWorkflow', function($http, $q) {
return {
getFlow: function() {
var deferred = $q.defer();
$http.get('steps.json').success(function(data) {
deferred.resolve(data);
}).error(function(){
deferred.reject();
});
return deferred.promise;
}
}
});
控制器代码段:
var workflow = angular.module("workflow", ['getWorkflow']);
workflow.controller("showStep", function($scope) {
$scope.workFlow = {}; // Create the workFlow object
$scope.workFlow.steps = []; // Create an empty array to hold the steps
$scope.workFlow.steps = getWorkflow.getFlow();
... set the first step as the active step and point to the HTML file ...
$scope.workFlow.buildNavButtons = function() {
scope.workFlow.buttonArray = []; // Create/reset the array of buttons to nothing
// The button for the PREVIOUS step.
if ($scope.workFlow.activeStepIndex > 0) { // Only add button if not the first step
var prevButton = {};
prevButton["destination"] = $scope.workFlow.activeStepIndex - 1;
prevButton["buttonText"] = "<< " + $scope.workFlow.steps[$scope.workFlow.activeStepIndex - 1].name;
prevButton["buttonClass"] = "workflow-previous";
$scope.workFlow.buttonArray.push(prevButton);
}
...
var-workflow=angular.module(“workflow”,['getWorkflow']);
workflow.controller(“showStep”,函数($scope){
$scope.workFlow={};//创建工作流对象
$scope.workFlow.steps=[];//创建一个空数组来保存这些步骤
$scope.workFlow.steps=getWorkflow.getFlow();
…将第一步设置为活动步骤并指向HTML文件。。。
$scope.workFlow.buildNavButtons=函数(){
scope.workFlow.buttonArray=[];//创建/重置按钮数组为空
//上一步的按钮。
如果($scope.workFlow.activeStepIndex>0){//如果不是第一步,则仅添加按钮
var prevButton={};
prevButton[“destination”]=$scope.workFlow.activeStepIndex-1;
prevButton[“buttonText”]=“您的操作几乎正确,只是有几个问题。
首先,您需要将工厂注入控制器,而不是作为模块的依赖项
var workflow = angular.module("workflow", []);
workflow.controller("showStep", function($scope, getWorkflow) {
第二,你需要等待承诺兑现后再行动:
getWorkflow.getFlow().then(
function(data) {
$scope.workFlow.steps = data
console.log($scope.workFlow.steps);
// "activeStep" controls which step appears on screen.
// This initialize it and loads default content.
$scope.workFlow.activeStep = $scope.workFlow.steps[0];
$scope.workFlow.activeStepIndex = 0;
console.log($scope.workFlow.activeStep);
$scope.workFlow.content = $scope.workFlow.activeStep.src; // The display of the step content itself - changing this changes the display.
}); // Use the factory below
这将解决promise的主要问题,并允许您继续。您可以在这里检查和工作。这是有效的-谢谢!我不明白.then方法是如何工作的,现在它是有意义的。(如果可以,将+1。)
var workflow = angular.module("workflow", []);
workflow.controller("showStep", function($scope, getWorkflow) {
getWorkflow.getFlow().then(
function(data) {
$scope.workFlow.steps = data
console.log($scope.workFlow.steps);
// "activeStep" controls which step appears on screen.
// This initialize it and loads default content.
$scope.workFlow.activeStep = $scope.workFlow.steps[0];
$scope.workFlow.activeStepIndex = 0;
console.log($scope.workFlow.activeStep);
$scope.workFlow.content = $scope.workFlow.activeStep.src; // The display of the step content itself - changing this changes the display.
}); // Use the factory below