Javascript，将复选框与 JSON 匹配

Question

我有：

• 多个复选框
• 提交按钮
• 一个 JSON 字符串对象。
• 一个检查哪些复选框被选中的函数，并在我的提交按钮上使用一个事件监听器在警报或 console.log 中返回它们的值。
• 输出 DIV

如何比较从检查哪些复选框被选中的函数获得的值与 JSON 字符串对象中的值，并将它们回显到输出 DIV 中？假设我选中了“Cheese”和“Garlic”框，并期望收到以下输出：

• 食谱 1：奶酪、番茄、大蒜
• 食谱 2：奶酪、土豆、蛋黄酱、牛肉、大蒜、黄油

HTML：

<form action="" method="">
    <input type="checkbox" value="Cheese">Cheese<br>
    <input type="checkbox" value="Tomato">Tomato<br>
    <input type="checkbox" value="Garlic">Garlic<br>
    <input type="checkbox" value="Bacon">Bacon<br>
    <input type="checkbox" value="Paprika">Paprika<br>
    <input type="checkbox" value="Onion">Onion<br>
    <input type="checkbox" value="Potato">Potato<br>
    <input type="checkbox" value="Mayo">Mayo<br>
    <input type="checkbox" value="Beef">Beef<br>
    <input type="checkbox" value="Garlic">Garlic<br>
    <input type="checkbox" value="Butter">Butter<br>

    <input type="button" value="Get recipes" id="getRecipesButton">
</form>

<div id="output">The results end up here</div>

JS：

//Recipes JSON-string:
var recipes = [
    {
        name:"recipe1",
        ingredients:
            [
                {ingredient:"Cheese"},
                {ingredient:"Tomato"},
                {ingredient:"Garlic"}
            ]
    },
    {
        name:"recipe2",
        ingredients:
            [
                {ingredient:"Cheese"},
                {ingredient:"Bacon"},
                {ingredient:"Paprika"},
                {ingredient:"Onion"}
            ]
    },
    {
        name:"recipe3",
        ingredients:
            [
                {ingredient:"Cheese"},
                {ingredient:"Potato"},
                {ingredient:"Mayo"},
                {ingredient:"Beef"},
                {ingredient:"Garlic"},
                {ingredient:"Butter"}
            ]
    }
];
//Test to retrieve single, specific entries: 
//      console.log(recipes[1].ingredients[0].ingredient);


//Test to get/return the checked values of the checkboxes:
function selectedBoxes(form) {
    let selectedBoxesArr = [];
    let inputFields = form.getElementsByTagName('input');
    let inputFieldsNumber = inputFields.length;

    for(let i=0; i<inputFieldsNumber; i++) {
        if(
            inputFields[i].type == 'checkbox' &&
            inputFields[i].checked == true
        ) selectedBoxesArr.push(inputFields[i].value);
    }
    return selectedBoxesArr;
}

var getRecipesButton = document.getElementById('getRecipesButton');
getRecipesButton.addEventListener("click", function(){
    let selectedCheckBoxes = selectedBoxes(this.form);
    alert(selectedCheckBoxes);
});

>>Fiddle

Answer 1

这是一种可以根据当前结构设置值的方法。请记住，在任何给定时间都不清楚您要应用什么配方，因此下面的代码会将第一个配方应用于表单。

//Recipes JSON-string:
var recipes = [{
    name: "recipe1",
    ingredients: [{
        ingredient: "Cheese"
      },
      {
        ingredient: "Tomato"
      },
      {
        ingredient: "Garlic"
      }
    ]
  },
  {
    name: "recipe2",
    ingredients: [{
        ingredient: "Cheese"
      },
      {
        ingredient: "Bacon"
      },
      {
        ingredient: "Paprika"
      },
      {
        ingredient: "Onion"
      }
    ]
  },
  {
    name: "recipe3",
    ingredients: [{
        ingredient: "Cheese"
      },
      {
        ingredient: "Potato"
      },
      {
        ingredient: "Mayo"
      },
      {
        ingredient: "Beef"
      },
      {
        ingredient: "Garlic"
      },
      {
        ingredient: "Butter"
      }
    ]
  }
];

var getRecipesButton = document.getElementById('getRecipesButton');
getRecipesButton.addEventListener("click", function() {
  for (let ingredient of recipes[0].ingredients) {
    document.querySelector(`input[value='${ingredient.ingredient}']`).setAttribute('checked', true);
  }
});

<form action="" method="">
  <input type="checkbox" value="Cheese">Cheese<br>
  <input type="checkbox" value="Tomato">Tomato<br>
  <input type="checkbox" value="Garlic">Garlic<br>
  <input type="checkbox" value="Bacon">Bacon<br>
  <input type="checkbox" value="Paprika">Paprika<br>
  <input type="checkbox" value="Onion">Onion<br>
  <input type="checkbox" value="Potato">Potato<br>
  <input type="checkbox" value="Mayo">Mayo<br>
  <input type="checkbox" value="Beef">Beef<br>
  <input type="checkbox" value="Garlic">Garlic<br>
  <input type="checkbox" value="Butter">Butter<br>

  <input type="button" value="Get recipes" id="getRecipesButton">
</form>

<div id="output">The results end up here</div>

如果您有任何问题，请随时发表评论

Answer 2

你觉得这个快速建议怎么样，我知道它不是很优雅：

HTML（用这个替换）

<ul id="output">The results end up here</ul>

JS

var getRecipesButton = document.getElementById('getRecipesButton');
getRecipesButton.addEventListener("click", function(){
    let selectedCheckBoxes = selectedBoxes(this.form);
    document.getElementById("output").innerHTML = "";
  var res = [];
  recipes.forEach(function(r,k){
    r['ingredients'].forEach(function(i,idx){
        if(selectedCheckBoxes.includes(i.ingredient)) {
        res.push(r);
      }
    });
  });
// remove duplicate then display the recipe with the ingredient
    res.filter(function(item, index){
      return res.indexOf(item) >= index;
    }).forEach(function(r){
      var ingredient = r.ingredients.map(function(r) { return r.ingredient}).join(", ");
      var name = r.name + " : "+ingredient ;
      var ul = document.getElementById("output");
      var li = document.createElement('li');
      li.appendChild(document.createTextNode(name));
      ul.appendChild(li);
    });
});

这里是一个工作版本：https://jsfiddle.net/8esvh65p/

Answer 3

您可以将您的食谱数组过滤为仅包含所有选定成分的食谱，如下所示：

let filtered = recipes.filter((recipe) => {
    return selectedCheckBoxes.every((selected) => {
        return recipe.ingredients.some((ingredient) => {
            return ingredient['ingredient'] === selected;
        });
    });
});

因此，对于每个食谱，我们都会检查每种所选成分是否包含在食谱中。在这种情况下：

• filter(): 过滤掉任何不包含所有选定成分的食谱；
• every(): 检查每个选择的成分是否在当前由 filter() 评估的配方中；
• some()： 检查配方的某些成分是否等于 every() 评估的当前选择成分。

我编辑了你的小提琴，所以你可以看到它工作：https://jsfiddle.net/byce6vwu/1/

编辑

您可以像这样将返回的数组转换为html（我还将输出div更改为ul：

let outputRecipes = '';
  filtered.forEach((recipe) => {
    let stringIngredients = recipe.ingredients.map((val) => {
        return val.ingredient;
    }).join(',');
        outputRecipes += `<li>${recipe.name}: ${stringIngredients}</li>`;
  });
    document.getElementById('output').innerHTML = outputRecipes;

我已经编辑了小提琴：https://jsfiddle.net/ys0qofgm/

因此，对于数组中的每个成分，我们将成分对象：{ingredient: "Cheese"} 转换为仅字符串 "Cheese"，并使用逗号作为分隔符连接数组的所有元素。然后为每个配方创建一个 li 元素，并将配方字符串放入其中。

Answer 4

此代码将执行您想要的操作。它遍历每种成分，检查食谱集及其成分以检查该食谱是否包含该成分。仅返回包含所有所选成分的食谱：

//Recipes JSON-string:
var recipes = [
	{
		name:"recipe1",
		ingredients:
			[
				{ingredient:"Cheese"},
				{ingredient:"Tomato"},
				{ingredient:"Garlic"}
			]
	},
	{
		name:"recipe2",
		ingredients:
			[
				{ingredient:"Cheese"},
				{ingredient:"Bacon"},
				{ingredient:"Paprika"},
				{ingredient:"Onion"}
			]
	},
	{
		name:"recipe3",
		ingredients:
			[
				{ingredient:"Cheese"},
				{ingredient:"Potato"},
				{ingredient:"Mayo"},
				{ingredient:"Beef"},
				{ingredient:"Garlic"},
				{ingredient:"Butter"}
			]
	}
];
//Test to retrieve single, specific entries:
//      console.log(recipes[1].ingredients[0].ingredient);


//Test to get/return the checked values of the checkboxes:
function selectedBoxes(form) {
	let selectedBoxesArr = [];
	let inputFields = form.getElementsByTagName('input');
	let inputFieldsNumber = inputFields.length;

	for(let i=0; i<inputFieldsNumber; i++) {
		if(
			inputFields[i].type == 'checkbox' &&
			inputFields[i].checked == true
		) selectedBoxesArr.push(inputFields[i].value);
	}
	return selectedBoxesArr;
}

var getRecipesButton = document.getElementById('getRecipesButton');
getRecipesButton.addEventListener("click", function(){
  let selectedCheckBoxes = selectedBoxes(this.form);
  let output = document.getElementById('output');
  let myRecipes = recipes.filter(r => 
    selectedCheckBoxes.every(s => 
       r.ingredients.some(i => i.ingredient == s)
    )
  );
  output.innerHTML = myRecipes.map(v => v.name + ': ' + v.ingredients.map(i => i.ingredient).join(', ')).join('<br>');
});

<form action="" method="">
	<input type="checkbox" value="Cheese">Cheese<br>
	<input type="checkbox" value="Tomato">Tomato<br>
	<input type="checkbox" value="Garlic">Garlic<br>
	<input type="checkbox" value="Bacon">Bacon<br>
	<input type="checkbox" value="Paprika">Paprika<br>
	<input type="checkbox" value="Onion">Onion<br>
	<input type="checkbox" value="Potato">Potato<br>
	<input type="checkbox" value="Mayo">Mayo<br>
	<input type="checkbox" value="Beef">Beef<br>
	<input type="checkbox" value="Garlic">Garlic<br>
	<input type="checkbox" value="Butter">Butter<br>

	<input type="button" value="Get recipes" id="getRecipesButton">
</form>

<div id="output">The results end up here</div>

Answer 5

我编辑了您的代码并使其更小，还添加了getRecipe，它将返回食谱。

//Recipes JSON-string:
var recipes = [
    {
        name:"recipe1",
        ingredients:
            [
                {ingredient:"Cheese"},
                {ingredient:"Tomato"},
                {ingredient:"Garlic"}
            ]
    },
    {
        name:"recipe2",
        ingredients:
            [
                {ingredient:"Cheese"},
                {ingredient:"Bacon"},
                {ingredient:"Paprika"},
                {ingredient:"Onion"}
            ]
    },
    {
        name:"recipe3",
        ingredients:
            [
                {ingredient:"Cheese"},
                {ingredient:"Potato"},
                {ingredient:"Mayo"},
                {ingredient:"Beef"},
                {ingredient:"Garlic"},
                {ingredient:"Butter"}
            ]
    }
];

function selectedBoxes(form) {
    let selectedBoxesArr = [];
    let inputFields = form.getElementsByTagName('input');
    // get all checked input values
    var checked = [...inputFields].filter((item) => item.checked == true
    ).map((item) => item.value)
    return checked;
}

// Validate the checked ingredients and get the recipes
function getRecipe(ingredients){
var recipe = [];
recipes.forEach((item)=> {
var found= false;
for(var ingredient in ingredients){
   var y = ingredients[ingredient]
   found= item.ingredients.filter((x) =>  x.ingredient.indexOf(y) != -1).length>0;
  if (!found)
      break;
    }
  if(found)
     recipe.push(item.name +":"+ item.ingredients.map((x)=> x.ingredient).join(", "));
});
return recipe;
}

var getRecipesButton = document.getElementById('getRecipesButton');
getRecipesButton.addEventListener("click", function(){
    let selectedCheckBoxes = selectedBoxes(this.form);
    console.log(getRecipe(selectedCheckBoxes))
});

<form action="" method="">
    <input type="checkbox" value="Cheese">Cheese<br>
    <input type="checkbox" value="Tomato">Tomato<br>
    <input type="checkbox" value="Garlic">Garlic<br>
    <input type="checkbox" value="Bacon">Bacon<br>
    <input type="checkbox" value="Paprika">Paprika<br>
    <input type="checkbox" value="Onion">Onion<br>
    <input type="checkbox" value="Potato">Potato<br>
    <input type="checkbox" value="Mayo">Mayo<br>
    <input type="checkbox" value="Beef">Beef<br>
    <input type="checkbox" value="Garlic">Garlic<br>
    <input type="checkbox" value="Butter">Butter<br>

    <input type="button" value="Get recipes" id="getRecipesButton">
</form>

<div id="output">The results end up here</div>