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javascript,将复选框与JSON匹配

lookup checkbox json javascript

Streching my competence · 技术社区 · 7 年前

我有:

多个复选框
要提交的按钮
JSON字符串对象。
一个函数,用于检查选中的复选框,并在alert或console.log中返回它们的值,其中evenlistener位于我的提交按钮上。
输出div

如何比较我从检查哪些复选框的函数中得到的值与JSON字符串对象中的值,并将它们回送到输出DIV中?假设我检查了“奶酪”和“大蒜”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

5 回复 | 直到 7 年前

Pedro leal 7 年前

您可以将您的一系列配方筛选为仅包含所有精选成分的配方,如:

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

所以,对于每一个配方,我们检查 每一个 所选配料包含在配方中。在这种情况下:

过滤器(): 过滤掉任何不包含所有选定成分的配方;
每个(): 检查筛选()所评估的当前配方中是否有每个选定成分;
(): 检查配方的某些成分是否等于当前选择的每()评估的成分。

我编辑了你的小提琴,这样你就可以看到它在工作: 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output 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,我们转换成分对象: {ingredient: "Cheese"} 只有一个字符串 “奶酪” 并使用逗号作为分隔符联接数组的所有元素。然后创建一个锂元素,并将配方字符串放入其中。

Miroslav Glamuzina 7 年前

下面是一种基于当前结构设置值的方法。请记住,您在任何给定时间都不清楚要应用什么配方,因此下面的代码将把第一个配方应用到表单中。

//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。

mub 7 年前

你觉得这个快速建议怎么样,我知道它不太优雅:

HTML(替换为此)

<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/

Nick SamSmith1986 7 年前

这段代码将满足您的需要。它迭代每种成分,检查一组配方及其成分,以检查该配方是否包含该成分。仅包括 全部的 所选成分返回:

//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>

Alen.Toma 7 年前

我编辑了你的代码,把它改小了,还添加了 getRecipe 这将返回食谱。

//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>