洗掉動態創建的表單元素-有解無憂

我一直在嘗試制作一個動態表單，以便用戶可以在他們提交的表單中添加一系列成分。我能夠動態添加輸入元素，但也想動態洗掉它們。我正在嘗試使用基本的 javascript 而沒有 jquery 來完成所有這些。我遇到的問題是，如果我將洗掉按鈕片段放在 addBtn 單擊事件中，我只能洗掉我選擇的一項。如果我嘗試將代碼片段放在 click 事件之外，我將無法通過 querySelectorAll 獲取我想要的元素陣列，因為查詢是在 addBtn 事件偵聽器關閉和元素創建之前進行的。提前致謝！

const ingredients = () => {
  const container = document.querySelector(".show-ingredients");
  const addBtn = document.querySelector(".add-ingredient");
  const newIngredient = document.querySelector("#input-ingredients");
  let ingredients = [];
  newIngredient.required = true;
  addBtn.addEventListener("click", async() => {
    newIngredient.required = false;
    ingredients.push(`
        <div >
            <input class='ingredient' type="text" value='${newIngredient.value}' required >
            <div >
                <a >
                    <span ></span>
                </a>
            </div>
        </div>`);
    container.innerHTML = ingredients.join("");
    newIngredient.value = "";
  });
  var deleteBtn = document.querySelectorAll(".delete-ingredient");
  console.log(deleteBtn);
  for (let i = 0; i < deleteBtn.length; i  ) {
    deleteBtn[i].addEventListener("click", async() => {
      console.log(i);
      // ingredients.splice(i, 1);
      // container.innerHTML = ingredients.join('');
    });
  }
  if (ingredients.length == 0) {
    newIngredient.required = true;
  }
};
ingredients();

.form-container {
  display: flex;
  text-align: center;
  flex-direction: column;
  text-align: center;
  justify-content: center;
  align-items: center;
  transition: all 0.5s ease-in-out;
}

.form-container input {
  width: 400px;
  max-width: 100%;
  height: 40px;
  padding-left: 10px;
  margin-bottom: 5px;
}


/* Add/delete ingredient */

.ingredient-wrapper {
  width: 400px;
  max-width: 100%;
  display: flex;
  flex-direction: column;
}

.ingredient-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 40px;
  width: 400px;
  max-width: 100%;
  border: 1px solid grey;
  margin-bottom: 5px;
}

.controls,
.controls.delete {
  background-color: green;
  height: 100%;
  width: 28px;
  padding-left: 1px;
}

.controls.delete {
  background-color: red;
}

.ingredient {
  margin-bottom: 0px;
  width: 100%;
  height: 100%;
  background: none;
}

.add-ingredient,
.delete-ingredient {
  width: 28px;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transition: 0.5s ease-in-out;
  cursor: pointer;
}

.ingredient-bar::before {
  content: "";
  background-color: white;
  display: block;
  height: 2px;
  width: 13px;
  transform: rotate(90deg);
}

.ingredient-bar {
  background-color: white;
  height: 2px;
  width: 13px;
}

.delete-ingredient {
  background-color: red;
}

.delete-ingredient .ingredient-bar::before {
  display: none;
}

<form action="" class="form-container" id="wrapper">
  <input type="text" placeholder="What's cookin?" id="input-title" style="margin-top: 20px;" required>
  <div class="ingredient-wrapper">
    <div class="ingredient-container">
      <input type="text" placeholder="Ingredients" id="input-ingredients" style="border: none; margin-bottom: 0px; width: 400px;max-width:100%; height: 100%;">
      <div class="controls">
        <a class="add-ingredient">
          <span class="ingredient-bar"></span>
        </a>
      </div>
    </div>
    <div class="show-ingredients"></div>
  </div>
  <input type="text" placeholder="Description/Instructions" id="input-description" required>
  <button type="submit" class="add-btn">Add post</button>
</form>

一個示例代碼筆：https ://codepen.io/benleem/pen/gOxgXWL （css 搞砸了，但功能相同）

uj5u.com熱心網友回復：

您應該能夠通過將.delete-ingredient選擇器和移動addEventListener到單獨的函式中來獲得所需的結果。

這是一個片段，它記錄了deletBtn陣列中的位置。我沒有更改 HTML 或 CSS。我應該添加的另一個小注意事項是，成分陣列未正確連接到洗掉按鈕，因為您每次都重新宣告該陣列（全域陣列與本地陣列）。但是，您實際上并不需要該陣列，因為您可以使用選擇特定元素deleteBtn[i]，然后可以使用 JavaScript.removeChild功能將其洗掉。

const ingredients = () => {
  const container = document.querySelector(".show-ingredients");
  const addBtn = document.querySelector(".add-ingredient");
  const newIngredient = document.querySelector("#input-ingredients");
  let ingredients = [];
  newIngredient.required = true;
  addBtn.addEventListener("click", async () => {
    newIngredient.required = false;
    ingredients.push(`
        <div >
            <input class='ingredient' type="text" value='${newIngredient.value}' required >
            <div >
                <a >
                    <span ></span>
                </a>
            </div>
        </div>`);
    container.innerHTML = ingredients.join("");
    newIngredient.value = "";
    deleteIngredient(ingredients, container);
  });
  if (ingredients.length == 0) {
    newIngredient.required = true;
  }
};

const deleteIngredient = (list, wrapper) =>{
    let ingredients = list;
    let container = wrapper;
    var deleteBtn = document.querySelectorAll('.delete-ingredient');
    for (let i = 0; i < ingredients.length; i  ) {
        deleteBtn[i].addEventListener('click', async () =>{
            console.log(i);
            ingredients.splice(i, 1);
            container.innerHTML = ingredients.join('');
          
            deleteIngredient(ingredients, container);
        });
    }
}

ingredients();

.form-container {
  display: flex;
  text-align: center;
  flex-direction: column;
  text-align: center;
  justify-content: center;
  align-items: center;
  transition: all 0.5s ease-in-out;
}

.form-container input {
  width: 400px;
  max-width: 100%;
  height: 40px;
  padding-left: 10px;
  margin-bottom: 5px;
}

/* Add/delete ingredient */

.ingredient-wrapper {
  width: 400px;
  max-width: 100%;
  display: flex;
  flex-direction: column;
}

.ingredient-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 40px;
  width: 400px;
  max-width: 100%;
  border: 1px solid grey;
  margin-bottom: 5px;
}

.controls,
.controls.delete {
  background-color: green;
  height: 100%;
  width: 28px;
  padding-left: 1px;
}

.controls.delete {
  background-color: red;
}

.ingredient {
  margin-bottom: 0px;
  width: 100%;
  height: 100%;
  background: none;
}

.add-ingredient,
.delete-ingredient {
  width: 28px;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transition: 0.5s ease-in-out;
  cursor: pointer;
}

.ingredient-bar::before {
  content: "";
  background-color: white;
  display: block;
  height: 2px;
  width: 13px;
  transform: rotate(90deg);
}

.ingredient-bar {
  background-color: white;
  height: 2px;
  width: 13px;
}

.delete-ingredient {
  background-color: red;
}

.delete-ingredient .ingredient-bar::before {
  display: none;
}

<form action="" class="form-container" id="wrapper">
  <input type="text" placeholder="What's cookin?" id="input-title" style="margin-top: 20px;" required>
  <div class="ingredient-wrapper">
    <div class="ingredient-container">
      <input type="text" placeholder="Ingredients" id="input-ingredients" style="border: none; margin-bottom: 0px; width: 400px;max-width:100%; height: 100%;">
      <div class="controls">
        <a class="add-ingredient">
          <span class="ingredient-bar"></span>
        </a>
      </div>
    </div>
    <div class="show-ingredients"></div>
  </div>
  <input type="text" placeholder="Description/Instructions" id="input-description" required>
  <button type="submit" class="add-btn">Add post</button>
</form>

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標籤：javascript dom

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