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问如何删除Javascript中的元素？
EN

Stack Overflow用户

提问于 2022-08-14 17:23:14

回答 3查看 80关注 0票数 0

我试图做一个汽车添加系统，但我希望系统删除一个元素，当删除按钮是clicked.But，它不删除element.What是问题吗？

#todo-list-input-text{
    font-family: sans-serif;
    font-size: 40px;
    position: absolute;
    left: 30px;
}


#todo-list-input{
    width: 300px;
    height: 30px;
    border-radius: 15px;
    position: absolute;
    top: 100px;
    left: 15px;
    font-family: sans-serif;
    font-size: 30px;
}


#todo-list-button{
    background-color: black;
    color: white;
    position: absolute;
    top: 100px;
    width: 100px;
    height: 35px;
    left: 330px;
    border-radius: 15px;
}

#todo-list{
    width: 700px;
    height: 1200px;
    border: 2px solid #d3d3d3;
    position: absolute;
    top: 200px;
}

#todo-list-todo{
    font-family: sans-serif;
    font-size: 40px;
    letter-spacing: 2px;
    position: absolute;
    left: 20px;
}

<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8'>
    <meta http-equiv='X-UA-Compatible' content='IE=edge'>
    <title>Page Title</title>
    <meta name='viewport' content='width=device-width, initial-scale=1'>
    <link rel='stylesheet' type='text/css' media='screen' href='todo_list.css'>
    <script src="https://code.jquery.com/jquery-3.6.0.js" integrity="sha256-H+K7U5CnXl1h5ywQfKtSj8PCmoN9aaq30gDh27Xc0jk=" crossorigin="anonymous"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.1.2/css/all.min.css" integrity="sha512-1sCRPdkRXhBV2PBLUdRb4tMg1w2YPf37qatUFeS7zlBy7jJI8Lf4VHwWfZZfpXtYSLy85pkm9GaYVYMfw5BC1A==" crossorigin="anonymous" referrerpolicy="no-referrer" />
</head>
<body>

    <h1 id="todo-list-input-text">To-do list</h1>

    <input id="todo-list-input" type="text">

    <input id="todo-list-button" onclick="Addtothelist();" type="button" value="Add to the list">

    <div id="todo-list"></div>

    <script>

        function Addtothelist(){

            var todo_list_value=$("#todo-list-input").val();

            var todo_list_div=document.createElement("div");

            todo_list_div.style.position="relative";

            todo_list_div.style.width="100px";

            todo_list_div.style.height="100px";

            todo_list_div.style.top="190px";

            todo_list_div.style.width="700px";

            todo_list_div.style.border="2px solid #d3d3d3";

            var todo_list_1="<h1 id='todo-list-todo'>Todo-activity</h1> <button onclick='Delete();' id='Delete_button'>Delete</button>";

            var Delete_button=document.getElementById("Delete_button");

            

            var todo_list_2=todo_list_1.replace("Todo-activity",todo_list_value);

            todo_list_div.innerHTML=todo_list_2;

            function Delete(){

                todo_list_div.remove();
            }
            
            document.body.appendChild(todo_list_div);
        }
    </script>
</body>
</html>

javascript

回答 3

Stack Overflow用户

发布于 2022-08-14 17:33:10

在Delete函数的内部定义Addtothelist函数。因此，当单击delete按钮时，Delete函数将不再在作用域中，因此您将看到“defined”错误。

定义全局范围中的每个函数，以及两个函数之间共享的任何变量。

#todo-list-input-text{
    font-family: sans-serif;
    font-size: 40px;
    position: absolute;
    left: 30px;
}


#todo-list-input{
    width: 300px;
    height: 30px;
    border-radius: 15px;
    position: absolute;
    top: 100px;
    left: 15px;
    font-family: sans-serif;
    font-size: 30px;
}


#todo-list-button{
    background-color: black;
    color: white;
    position: absolute;
    top: 100px;
    width: 100px;
    height: 35px;
    left: 330px;
    border-radius: 15px;
}

#todo-list{
    width: 700px;
    height: 1200px;
    border: 2px solid #d3d3d3;
    position: absolute;
    top: 200px;
}

#todo-list-todo{
    font-family: sans-serif;
    font-size: 40px;
    letter-spacing: 2px;
    position: absolute;
    left: 20px;
}

<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8'>
    <meta http-equiv='X-UA-Compatible' content='IE=edge'>
    <title>Page Title</title>
    <meta name='viewport' content='width=device-width, initial-scale=1'>
    <link rel='stylesheet' type='text/css' media='screen' href='todo_list.css'>
    <script src="https://code.jquery.com/jquery-3.6.0.js" integrity="sha256-H+K7U5CnXl1h5ywQfKtSj8PCmoN9aaq30gDh27Xc0jk=" crossorigin="anonymous"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.1.2/css/all.min.css" integrity="sha512-1sCRPdkRXhBV2PBLUdRb4tMg1w2YPf37qatUFeS7zlBy7jJI8Lf4VHwWfZZfpXtYSLy85pkm9GaYVYMfw5BC1A==" crossorigin="anonymous" referrerpolicy="no-referrer" />
</head>
<body>

    <h1 id="todo-list-input-text">To-do list</h1>

    <input id="todo-list-input" type="text">

    <input id="todo-list-button" onclick="Addtothelist();" type="button" value="Add to the list">

    <div id="todo-list"></div>

    <script>

        var todo_list_div;

        function Addtothelist(){

            var todo_list_value=$("#todo-list-input").val();

            todo_list_div=document.createElement("div");

            todo_list_div.style.position="relative";

            todo_list_div.style.width="100px";

            todo_list_div.style.height="100px";

            todo_list_div.style.top="190px";

            todo_list_div.style.width="700px";

            todo_list_div.style.border="2px solid #d3d3d3";

            var todo_list_1="<h1 id='todo-list-todo'>Todo-activity</h1> <button onclick='Delete();' id='Delete_button'>Delete</button>";

            var Delete_button=document.getElementById("Delete_button");

            var todo_list_2=todo_list_1.replace("Todo-activity",todo_list_value);

            todo_list_div.innerHTML=todo_list_2;
            
            document.body.appendChild(todo_list_div);
        }
        
        function Delete(){
          todo_list_div.remove();
        }
    </script>
</body>
</html>

票数 1

Stack Overflow用户

发布于 2022-08-14 17:48:30

只需一行解决方案:-

只需将整个Delete函数放在delete按钮的onclick属性中，因为它只是一行，如下所示：

// somewhere in your code, find this var and replace it properly
var todo_list_1 = "...<button onclick='this.parentNode.remove()' id='Delete_button'>Delete</button>";

为什么删除按钮不能工作

因为您没有全局声明Delete函数，而是在另一个函数中声明

票数 0

Stack Overflow用户

发布于 2022-08-14 18:12:18

您正在使用jQuery。意思是：“少写，多做！”

不需要冗长的document.createElement()和属性定义表达式。使用jQuery-way来实现它：

const $body=$("body")
 .on("click","button.delbtn",function(){ // this: clicked button
   $(this).closest("div").remove()})
 .on("click","[type=button]",ev=>
   $body.append('<div style="position:relative;width:100px;height:100px;top:190px;width:700px;border:2px solid #d3d3d3"><h1 id="todo-list-todo">'+$("#todo-list-input").val()+'</h1><button class="delbtn">Delete</button></div>'))

#todo-list-input-text{
    font-family: sans-serif;
    font-size: 40px;
    position: absolute;
    left: 30px;
}

#todo-list-input{
    width: 300px;
    height: 30px;
    border-radius: 15px;
    position: absolute;
    top: 100px;
    left: 15px;
    font-family: sans-serif;
    font-size: 30px;
}

#todo-list-button{
    background-color: black;
    color: white;
    position: absolute;
    top: 100px;
    width: 100px;
    height: 35px;
    left: 330px;
    border-radius: 15px;
}

#todo-list{
    width: 700px;
    height: 1200px;
    border: 2px solid #d3d3d3;
    position: absolute;
    top: 200px;
}

#todo-list-todo{
    font-family: sans-serif;
    font-size: 40px;
    letter-spacing: 2px;
    position: absolute;
    left: 20px;
}

<script src="https://code.jquery.com/jquery-3.6.0.js" integrity="sha256-H+K7U5CnXl1h5ywQfKtSj8PCmoN9aaq30gDh27Xc0jk=" crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.1.2/css/all.min.css" integrity="sha512-1sCRPdkRXhBV2PBLUdRb4tMg1w2YPf37qatUFeS7zlBy7jJI8Lf4VHwWfZZfpXtYSLy85pkm9GaYVYMfw5BC1A==" crossorigin="anonymous" referrerpolicy="no-referrer" />
 <h1 id="todo-list-input-text">To-do list</h1>
 <input id="todo-list-input" type="text">
 <input id="todo-list-button" type="button" value="Add to the list">
 <div id="todo-list"></div>

票数 0

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/73353656

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