我正在製作一個動態列表,用戶可以在其中點擊按鈕來刪除輸入。建立新輸入時,我使用計數器為子元素分配一個 ID,每次產生新輸入時計數器都會加 1。但是,當我嘗試透過 ID 刪除輸入時,似乎只有最新建立的輸入是可刪除的。
我注意到,如果您產生 5 個新輸入,然後按一下 input:2 上的刪除按鈕,則會刪除第 5 個輸入和按鈕。因此,即使我在此過程的早期設定了輸入和按鈕 ID,單擊刪除按鈕也僅依賴行計數器的當前值。
有人可以給我一些關於如何指向舊 ID 的指示嗎?或者我需要以完全不同的方式重寫它?我對 JS 很陌生,所以如果這是可怕的 JS 腳本,我深表歉意!
var row = 1; function addFields() { row++; var container = document.getElementById("container"); var input = document.createElement("input"); input.id = "input_" + row input.type = "text"; input.placeholder = "input:" + row; container.appendChild(input); var button = document.createElement("button"); button.id = "button_" + row; button.type = "button"; button.innerText = "Remove"; button.onclick = function() { remove_field("button_" + row, "input_" + row); } container.appendChild(button); } function remove_field(button_id, input_id) { var elem = document.getElementById(button_id); elem.remove(); var elem = document.getElementById(input_id); elem.remove(); }
<input type="text" id="goal" name="goal"> <button type="button" onclick="addFields()">+</button><br> <div class="container" id="container" />
P粉3114649352024-01-17 13:07:07
row
的值在每次迭代時都會發生變化,而您的點擊函數只考慮它的最後一個值。您可以使用 let
確定其範圍,bind
它,或者只是將元素傳遞給您的刪除函數,這也會跳過查找。
//REM: Can remove the row with this solution, just left to show you the issue. var row = 1; function addFields() { row++; var container = document.getElementById("container"); var input = document.createElement("input"); input.id = "input_" + row input.type = "text"; input.placeholder = "input:" + row; container.appendChild(input); var button = document.createElement("button"); button.id = "button_" + row; button.type = "button"; button.innerText = "Remove"; //REM: Binding the elements //REM: Alternatively you can bind the current value of row. button.onclick = function(buttonElement, inputElement, currentRow){ console.log('This is the value row would have: ', row); console.log('This is the value row had at time of binding: ', currentRow); //REM: Passing the elements to skip any lookup remove_field(buttonElement, inputElement) }.bind(button, button, input, row); container.appendChild(button); } //REM: Removes a button-input pair function remove_field(buttonElement, inputElement){ buttonElement?.remove(); inputElement?.remove() }
<input type="text" id="goal" name="goal"> <button type="button" onclick="addFields()">+</button><br> <div class="container" id="container" />
P粉6052337642024-01-17 00:06:51
每次新增元素時,row
的值都會更新,因此不要直接使用 row
來取得 id。直接存取 button.id
和 input.id
。
var row = 1; function addFields() { row++; var container = document.getElementById("container"); var input = document.createElement("input"); input.id = "input_" + row input.type = "text"; input.placeholder = "input:" + row; container.appendChild(input); var button = document.createElement("button"); button.id = "button_" + row; button.type = "button"; button.innerText = "Remove"; button.onclick = function() { remove_field(button.id, input.id); } container.appendChild(button); } function remove_field(button_id, input_id) { var elem = document.getElementById(button_id); elem.remove(); var elem = document.getElementById(input_id); elem.remove(); }
<input type="text" id="goal" name="goal"> <button type="button" onclick="addFields()">+</button><br> <div class="container" id="container" />