Question

我想创建我添加到每个li元素的删除按钮，以删除他所代表的确切元素。我的代码只删除父节点的第一个子节点。我希望你们能理解我想要的东西：）

window.onload = function(){
    document.getElementById("form").onsubmit = addElementsToList;

    //creating the function that adds elements to the unordered list

    function addElementsToList() {
        var liElements = document.createElement("LI");
        var textNode = document.createTextNode(document.getElementById('text').value);
        var input = document.createElement("INPUT");
        var button = document.createElement("INPUT");



        button.setAttribute("type", "button");
        input.setAttribute("type", "checkbox");
        liElements.className = "li";
        input.className = "checkbox";
        button.value = "Delete";

        button.className = "btn";
        var btn = document.getElementsByClassName("btn");
        for (var i = 0; i < btn.length - 1; i++) {
            btn[i].id = "btn";
        }
        console.log(btn);
        console.log(btn.length)

        liElements.appendChild(textNode);
        liElements.appendChild(input);
        liElements.appendChild(button);

        var paragraph1 = document.getElementById("elements").firstChild;
        document.getElementById("elements").insertBefore(liElements,paragraph1);

        //toggle done class
        var elementClasses = liElements.classList;
        function onCheckBoxChange() {
            liElements.addEventListener("change", function() {
                liElements.classList.toggle("done");
            });
        }

        button.onclick = removeElement;
        //function that removes the element
        function removeElement() {
            var list = document.getElementById('elements');
            list.removeChild(list.childNodes[0]);
        }

        onCheckBoxChange();

        return false;
    }

};

body {
    background: #f9bc02;
}

#container {
    background: #fb9902;
    width: 60%;
    margin:20px auto;
    overflow: auto;
    padding: 20px;
}

#form {
    background: #fb9902;
    width: 50%;
    margin:20px auto;
    padding: 20px;
}

#text {
    width:75%;
    height:50px;
    border:0;
    border-radius: 15px;
    background-color: #fff;
    text-align: center;
}

#submit {
    width:20%;
    height:50px;
    border: 0;
    background-color: #fff;
    border-radius: 15px;
    cursor:pointer;
}

#ul_elements {
    background: #fb9902;
    width: 50%;
    margin:20px auto;
    padding: 20px;
}

header {
    text-align: center;
    margin: 0 auto;
}

li {
    text-align: left;
    display: block;
}

.li{
    color:#fff;
    text-align: left;
    font-size: 35px;
    font-weight: bolder;
    max-width: 65%;
    padding-top: 10px;
    padding-bottom: 10px;
}

.checkbox {
    width:30px;
    height:30px;
    position: absolute;
    left:60%;
}
.done {
    color:green;
    text-decoration: line-through;
}

<!DOCTYPE html>
<html lang="en">
    <head>
        <lang>
        <title>ToDoList_2</title>
        <meta charset="UTF-8">
        <script src="js/script.js"></script>
        <link rel="stylesheet" type="text/css" href="css/style.css">
    <head>
    <body>
        <div id="container">
            <header>
                <h1>To do list</h1>
            </header>
            <form id="form">
                    <input type="text"  id="text"  value="Type here!" class="input">
                    <input type="submit" value="Submit" id="submit" class="input">
            </form>
            <div id="ul_elements">
                <ul id="elements">
                    
                </ul>
            </div>
        </div>
    </body>
</html>

Answer 1

使用event来获取目标元素以删除确切元素。请尝试以下代码。

window.onload = function(){
    document.getElementById("form").onsubmit = addElementsToList;

    //creating the function that adds elements to the unordered list

    function addElementsToList() {
        var liElements = document.createElement("LI");
        var textNode = document.createTextNode(document.getElementById('text').value);
        var input = document.createElement("INPUT");
        var button = document.createElement("INPUT");



        button.setAttribute("type", "button");
        input.setAttribute("type", "checkbox");
        liElements.className = "li";
        input.className = "checkbox";
        button.value = "Delete";

        button.className = "btn";
        var btn = document.getElementsByClassName("btn");
        for (var i = 0; i < btn.length - 1; i++) {
            btn[i].id = "btn";
        }
        console.log(btn);
        console.log(btn.length)

        liElements.appendChild(textNode);
        liElements.appendChild(input);
        liElements.appendChild(button);

        var paragraph1 = document.getElementById("elements").firstChild;
        document.getElementById("elements").insertBefore(liElements,paragraph1);

        //toggle done class
        var elementClasses = liElements.classList;
        function onCheckBoxChange() {
            liElements.addEventListener("change", function() {
                liElements.classList.toggle("done");
            });
        }

        button.onclick = removeElement;
        //function that removes the element
        function removeElement(event) {
            var list = document.getElementById('elements');

            list.removeChild(event.target.parentElement);
        }

        onCheckBoxChange();

        return false;
    }

};

body {
    background: #f9bc02;
}

#container {
    background: #fb9902;
    width: 60%;
    margin:20px auto;
    overflow: auto;
    padding: 20px;
}

#form {
    background: #fb9902;
    width: 50%;
    margin:20px auto;
    padding: 20px;
}

#text {
    width:75%;
    height:50px;
    border:0;
    border-radius: 15px;
    background-color: #fff;
    text-align: center;
}

#submit {
    width:20%;
    height:50px;
    border: 0;
    background-color: #fff;
    border-radius: 15px;
    cursor:pointer;
}

#ul_elements {
    background: #fb9902;
    width: 50%;
    margin:20px auto;
    padding: 20px;
}

header {
    text-align: center;
    margin: 0 auto;
}

li {
    text-align: left;
    display: block;
}

.li{
    color:#fff;
    text-align: left;
    font-size: 35px;
    font-weight: bolder;
    max-width: 65%;
    padding-top: 10px;
    padding-bottom: 10px;
}

.checkbox {
    width:30px;
    height:30px;
    position: absolute;
    left:60%;
}
.done {
    color:green;
    text-decoration: line-through;
}

<!DOCTYPE html>
<html lang="en">
    <head>
        <lang>
        <title>ToDoList_2</title>
        <meta charset="UTF-8">
        <script src="js/script.js"></script>
        <link rel="stylesheet" type="text/css" href="css/style.css">
    <head>
    <body>
        <div id="container">
            <header>
                <h1>To do list</h1>
            </header>
            <form id="form">
                    <input type="text"  id="text"  value="Type here!" class="input">
                    <input type="submit" value="Submit" id="submit" class="input">
            </form>
            <div id="ul_elements">
                <ul id="elements">
                    
                </ul>
            </div>
        </div>
    </body>
</html>

我想，当我按下删除按钮删除delet按钮所代表的元素时。

1 个答案: