我是Javascript的新手和编程初学者。我有一个＆＃34;步骤＆＃34;具有选择/解决方案字段的对象。此选项/解决方案字段引用列表中的另一个对象。我想基于此字段从此列表中创建树层次结构。
[这是我希望像树一样重组的数组文件：
$scope.nodes = {
"story": {
"step" : [
{
"title": "Begin",
"id": "0",
"type": "MultipleChoice",
"description": "Yo, bro it's the start of the adventure !",
"choice": [
{
"nextStepId": "1",
"#text": "You was born as a troll, no luck in life. :'("
}]
},
{
"title": "Choice",
"id": "1",
"type": "MultipleChoice",
"description": "It's time to take your life back, and choice what you should do !",
"choice": [
{
"nextStepId": "1001",
"#text": "Take an apple"
},
{
"nextStepId": "4",
"#text": "Suicide"
},
{
"nextStepId": "1001",
"#text": "You use a coin to know what to do"
}
]
},
{
"title": "Riddle",
"id": "4",
"type": "Riddle",
"description": "What is the best way to suicide ?",
"solution": {
"nextStep": "1000",
"#text": "think"
}
},
{
"title": "you are dead",
"id": "1000",
"type": "End",
"win": "true",
"description": "Nice, you are dead finally !"
},
{
"title": "you are alive",
"id": "1001",
"type": "End",
"win": "false",
"description": "Damn, you are still alive !"
}
]
}
}
这是我到目前为止所做的：
$scope.tree = function tree() {
var map = {}, node, roots = [];
for (var i = 0; i < nodes.length; i += 1) {
node = nodes.story.step[i];
map[node.id] = i;
if (node.id !== "0") {
switch (node.type) {
case ("MultipleChoice"):
for (var j = 0; i < node.choice.length; j += 1)
nodes[map[node.id]].choice[j].nextStepId[j].push(node);
break;
case ("Riddle"):
nodes[map[node.id]].solution.nextStep[j].push(node);
break;
case ("End"):
//TO DO
}
}
else {
roots.push(node);
}
}
}(nodes)
（请注意，子项（选项/解决方案）可以包含多个父项，并且“选择”可以是数组或一个元素。）
显然，我做错了什么。选择是未定义的＆＃39;
你能纠正我吗？我无法弄明白。我最好保留自己的代码，以便从我的错误中吸取教训，但如果你有别的建议，我会感到自由。非常感谢
答案 0 :(得分：0)
我会以不同的方式编码。在这里使用ng-switch非常有用。然后，您可以将当前步骤存储在变量中，并在ng-switch中决定您要显示的内容（多个选项，Riddle或结束）。
如果您想阻止用户作弊，您必须在服务器端添加解决方案检查，因为您的模型在浏览器控制台中是可读的，用户可以在点击之前检查正确的答案。
你应用程序的唯一部分，我不清楚它的谜语＆＃39;题。所以这可能不像你想要的那样。但这不应该难以修改。
请查看下面的演示或fiddle。
angular.module('demoApp', [])
.controller('mainCtrl', MainCtrl);
function MainCtrl($scope) {
var vm = this;
var nodes = {
"story": {
"step": [{
"title": "Begin",
"id": "0",
"type": "MultipleChoice",
"description": "Yo, bro it's the start of the adventure !",
"choice": [{
"nextStepId": "1",
"#text": "You was born as a troll, no luck in life. :'("
}]
}, {
"title": "Choice",
"id": "1",
"type": "MultipleChoice",
"description": "It's time to take your life back, and choice what you should do !",
"choice": [{ // missing [ here
"nextStepId": "1001",
"#text": "Take an apple"
}, {
"nextStepId": "4",
"#text": "Suicide"
}, {
"nextStepId": "1001",
"#text": "You use a coin to know what to do"
}]
}, {
"title": "Riddle",
"id": "4",
"type": "Riddle",
"description": "What is the best way to suicide ?",
"solution": {
"nextStepId": "1000",
"#text": "think"
}
}, {
"title": "you are dead",
"id": "1000",
"type": "End",
"win": true,
"description": "Nice, you are dead finally !"
}, {
"title": "you are alive",
"id": "1001",
"type": "End",
"win": false,
"description": "Damn, you are still alive !"
}]
}
};
function getById(id) {
var node;
for(var i=0; i<nodes.story.step.length; i++) {
node = nodes.story.step[i];
if ( node.id === id ) {
return node;
}
}
}
angular.extend(vm, {
nodes: nodes,
curStep: nodes.story.step[0],
next: function(id) {
vm.curStep = getById(id);
}
});
/*
// too complicated
$scope.tree = function tree() {
var map = {},
node, roots = [];
for (var i = 0; i < nodes.story.step.length; i++) { // nodes is an object
//console.log(nodes.story);
node = nodes.story.step[i];
console.log(node);
node.choice.nextStepId = [];
node.solution.nextStep = [];
map[node.id] = i;
if (node.id !== "0") {
switch (node.type) {
case ("MultipleChoice"):
for (var j = 0; i < node.choice.length; j += 1)
nodes[map[node.choice[j].nextStepId]].choice[j].nextStepId.push(node);
break;
case ("Riddle"):
nodes[map[node.id]].solution.nextStep.push(node);
}
} else {
roots.push(node);
}
}
console.log(JSON.stringify(roots, null, 2));
}
$scope.tree();*/
}<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="demoApp" ng-controller="mainCtrl as ctrl">
<div>
{{ctrl.curStep.description}}
<div ng-switch="ctrl.curStep.type">
<div ng-switch-when="MultipleChoice">
<div ng-repeat="choice in ctrl.curStep.choice">
<!--<label>{{choice['#text']}}</label>-->
<!--<input type="checkbox" ng-click="ctrl.next(choice.nextStepId)"/>-->
<button ng-click="ctrl.next(choice.nextStepId)">
{{choice['#text']}}
</button>
</div>
</div>
<div ng-switch-when="Riddle">
<a href="#" ng-click="ctrl.next(ctrl.curStep.solution.nextStepId)">{{ctrl.curStep.solution['#text']}}</a>
</div>
<div ng-switch-when="End">
Game Over! <strong>{{ctrl.curStep.win ? 'You\'ve won!': 'You\'ve lost'}}</strong>
</div>
</div>
<!-- just for debugging <pre>{{ctrl.nodes | json: 2}}</pre>-->
</div>