动态地将属性和值分配给javascript对象

时间：2018-10-16 11:30:02

标签： javascript jquery javascript-objects

我正在尝试创建一个星期膳食计划器。目前情况如下：

  1. 您点击一天中的某个时间（早餐/午餐/晚餐）+一周中的某天；
  2. 淡出的食谱列表；
  3. 通过选择（单击）某个食谱，您可以将该食谱分配给第一个星期几+之前选择的时间。

我想将所有这些数据存储到一个JS对象中，理想情况下，我想动态创建day对象，其中将Breakfast / Lunch / dinner作为键，将配方作为值，但是我有点卡在这里。我创建了一个jsfiddle作为我要实现的目标的小样。问题是当我选择例如周一早餐的食谱1确实可以正确存储，但是，如果我选择午餐的食谱2-早餐的价值重新设置为0。有人可以帮助我了解为什么会这样，并指导我采取更好的方法吗？任何建议/帮助都非常感谢！非常感谢你！

// find elements
var data_day = '',
time_of_day = '',
recipe = $('.recipes .recipe'),
weekly_recipes = {
  'week_day': {}
};

// show list of recipes
$("[data-time]").on("click", function(){
	$('.recipes').fadeIn();
  time_of_day = $(this).attr('data-time');
  data_day = $(this).parents('.column').attr('data-day');
});

recipe.on('click', function(){
	var recipe_name = $(this).attr('data-recipe');
  weekly_recipes.week_day[data_day] = {
  	'breakfast': 0,
    'lunch': 0,
    'dinner': 0
	};
  $('.recipes').fadeOut();
	weekly_recipes.week_day[data_day][time_of_day] = recipe_name;
	$('.meal-plan').text(JSON.stringify(weekly_recipes));
	console.log(weekly_recipes);
});
body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

.column{
  width: 25%;
  float: left;
  padding: 10px;
}
.column strong{
  display: block;
  margin-bottom: 20px;
}
.column .wrp{
  background: white;
}
.column [data-time]{
  cursor: pointer;
  margin-bottom: 10px;
}
.recipes{
  width: 100%;
  display: none;
  clear: both;
  margin-top: 40px;
  background: white;
}
.recipes span{
  display: block;
  cursor: pointer;
  margin-top: 10px;
}
.meal-plan{
  margin-top: 20px;
  background: white;
  clear: both;
  margin-top: 40px;
  background: white;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<div class="column" data-day="monday">
  <div class="wrp">
    <strong>Monday</strong>
  <div data-time="breakfast">Breakfast</div>
  <div data-time="lunch">Lunch</div>
  <div data-time="dinner">Dinner</div>
  </div>
</div>
<div class="column" data-day="tuesday">
  <div class="wrp">
    <strong>Tuesday</strong>
  <div data-time="breakfast">Breakfast</div>
  <div data-time="lunch">Lunch</div>
  <div data-time="dinner">Dinner</div>
  </div>
</div>

<div class="column" data-day="wednesday">
  <div class="wrp">
    <strong>Wednesday</strong>
  <div data-time="breakfast">Breakfast</div>
  <div data-time="lunch">Lunch</div>
  <div data-time="dinner">Dinner</div>
  </div>
</div>

<div class="recipes">
  <div class="recipe" data-recipe="recipe-1">
   <span data-recipe="recipe-1">recipe 1</span>
  </div>
  <div class="recipe" data-recipe="recipe-2">
   <span data-recipe="recipe-2">recipe 2</span>
  </div>
</div>

<div class="meal-plan">
</div>
</div>

2 个答案:

答案 0 :(得分：3)

您快到了，但是整个问题是您每次用户单击Recepie时都将对象重置为默认0值。

相反，您需要检查一下是否已初始化，然后不要将其重置为默认值。

我添加了以下代码：

 if(!weekly_recipes.week_day.hasOwnProperty(data_day) || Object.keys(weekly_recipes.week_day[data_day]).length === 0){
    weekly_recipes.week_day[data_day] = {
      'breakfast': 0,
      'lunch': 0,
      'dinner': 0
    };
  }

请参见下面的工作代码：

// find elements
var data_day = '',
  time_of_day = '',
  recipe = $('.recipes .recipe'),
  weekly_recipes = {
    'week_day': {}
  };

// show list of recipes
$("[data-time]").on("click", function() {
  $('.recipes').fadeIn();
  time_of_day = $(this).attr('data-time');
  data_day = $(this).parents('.column').attr('data-day');
});

recipe.on('click', function() {
  var recipe_name = $(this).attr('data-recipe');
  console.log(weekly_recipes.week_day[data_day]);
  if (!weekly_recipes.week_day.hasOwnProperty(data_day) || Object.keys(weekly_recipes.week_day[data_day]).length === 0) {
    weekly_recipes.week_day[data_day] = {
      'breakfast': 0,
      'lunch': 0,
      'dinner': 0
    };
  }
  $('.recipes').fadeOut();
  weekly_recipes.week_day[data_day][time_of_day] = recipe_name;
  $('.meal-plan').text(JSON.stringify(weekly_recipes));
  console.log(weekly_recipes);
});
body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

.column {
  width: 25%;
  float: left;
  padding: 10px;
}

.column strong {
  display: block;
  margin-bottom: 20px;
}

.column .wrp {
  background: white;
}

.column [data-time] {
  cursor: pointer;
  margin-bottom: 10px;
}

.recipes {
  width: 100%;
  display: none;
  clear: both;
  margin-top: 40px;
  background: white;
}

.recipes span {
  display: block;
  cursor: pointer;
  margin-top: 10px;
}

.meal-plan {
  margin-top: 20px;
  background: white;
  clear: both;
  margin-top: 40px;
  background: white;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<div class="column" data-day="monday">
  <div class="wrp">
    <strong>Monday</strong>
    <div data-time="breakfast">Breakfast</div>
    <div data-time="lunch">Lunch</div>
    <div data-time="dinner">Dinner</div>
  </div>
</div>
<div class="column" data-day="tuesday">
  <div class="wrp">
    <strong>Tuesday</strong>
    <div data-time="breakfast">Breakfast</div>
    <div data-time="lunch">Lunch</div>
    <div data-time="dinner">Dinner</div>
  </div>
</div>

<div class="column" data-day="wednesday">
  <div class="wrp">
    <strong>Wednesday</strong>
    <div data-time="breakfast">Breakfast</div>
    <div data-time="lunch">Lunch</div>
    <div data-time="dinner">Dinner</div>
  </div>
</div>

<div class="recipes">
  <div class="recipe" data-recipe="recipe-1">
    <span data-recipe="recipe-1">recipe 1</span>
  </div>
  <div class="recipe" data-recipe="recipe-2">
    <span data-recipe="recipe-2">recipe 2</span>
  </div>
</div>

<div class="meal-plan">
</div>
</div>

答案 1 :(得分：2)

您的代码即将投入使用，仅当某天的对象已经存在时，您只需注意不要再次创建它。

请参见下面的代码，您可以在不存在的情况下创建新的一天（如果已经存在），然后将配方添加到当天的time_of_day 

var data_day = '',
time_of_day = '',
recipe = $('.recipes .recipe'),
weekly_recipes = {
  'week_day': {}
};

$("[data-time]").on("click", function(){
	$('.recipes').fadeIn();
  time_of_day = $(this).attr('data-time');
  data_day = $(this).parents('.column').attr('data-day');
});

recipe.on('click', function(){
  var recipe_name = $(this).attr('data-recipe');
  
  //CHECK FOR DAY EXISTANCE
  if (weekly_recipes.week_day[data_day] == null || !weekly_recipes.week_day.hasOwnProperty(data_day)){
    weekly_recipes.week_day[data_day] = {
      'breakfast': 0,
      'lunch': 0,
      'dinner': 0
    };
  }
  
  weekly_recipes.week_day[data_day][time_of_day] = recipe_name;
  $('.recipes').fadeOut();
	$('.meal-plan').text(JSON.stringify(weekly_recipes));
  console.clear()
	console.log(weekly_recipes);
});
body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

.column{
  width: 25%;
  float: left;
  padding: 10px;
}
.column strong{
  display: block;
  margin-bottom: 20px;
}
.column .wrp{
  background: white;
}
.column [data-time]{
  cursor: pointer;
  margin-bottom: 10px;
}
.recipes{
  width: 100%;
  display: none;
  clear: both;
  margin-top: 40px;
  background: white;
}
.recipes span{
  display: block;
  cursor: pointer;
  margin-top: 10px;
}
.meal-plan{
  margin-top: 20px;
  background: white;
  clear: both;
  margin-top: 40px;
  background: white;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<div class="column" data-day="monday">
  <div class="wrp">
    <strong>Monday</strong>
  <div data-time="breakfast">Breakfast</div>
  <div data-time="lunch">Lunch</div>
  <div data-time="dinner">Dinner</div>
  </div>
</div>
<div class="column" data-day="tuesday">
  <div class="wrp">
    <strong>Tuesday</strong>
  <div data-time="breakfast">Breakfast</div>
  <div data-time="lunch">Lunch</div>
  <div data-time="dinner">Dinner</div>
  </div>
</div>

<div class="column" data-day="wednesday">
  <div class="wrp">
    <strong>Wednesday</strong>
  <div data-time="breakfast">Breakfast</div>
  <div data-time="lunch">Lunch</div>
  <div data-time="dinner">Dinner</div>
  </div>
</div>

<div class="recipes">
  <div class="recipe" data-recipe="recipe-1">
   <span data-recipe="recipe-1">recipe 1</span>
  </div>
  <div class="recipe" data-recipe="recipe-2">
   <span data-recipe="recipe-2">recipe 2</span>
  </div>
</div>
<div class="meal-plan"></div>

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