Question

我正在尝试使用文本输入创建新的li元素。问题是在文本出现时，它不会创建我可以设置样式的实际li元素。文本在那里，但它只是紧挨着彼此形成。这是我的HTML：

const button = document.getElementById('submit');

button.addEventListener ("click", () => {
  var taskInput = document.getElementById('task').value;
  // Creating the text for list item.
  if (taskInput === '') { // Prevents empty list item.
    alert("You have to type a task!");
  } else {
  var listItem = document.createElement("li"); // Create li element.
  var text = document.createTextNode(taskInput); // Create text for list item.
  listItem.appendChild(text); // Append text to li element.
  }
  
  //Add new list item to list
  var list = document.getElementById("list");
  list.appendChild(text);
  
});

<body>
<h1>Start your list!</h1>
<div class="input">
<input type="text" id="task">
<button id="submit">Create</button>
</div>
<section id="list">
</section>
</body>

Answer 1

只需使用<ul>代替<section>并附加listeItem而不是text。

＆＃13;

const button = document.getElementById('submit');

button.addEventListener ("click", () => {
  var taskInput = document.getElementById('task').value;
  // Creating the text for list item.
  if (taskInput === '') { // Prevents empty list item.
alert("You have to type a task!");
  } else {
  var listItem = document.createElement("li"); // Create li element.
  var text = document.createTextNode(taskInput); // Create text for list item.
  listItem.appendChild(text); // Append text to li element.
  }

  //Add new list item to list
  var list = document.getElementById("list");
  list.appendChild(listItem);

});

＆＃13;

<body>
<h1>Start your list!</h1>
<div class="input">
<input type="text" id="task">
<button id="submit">Create</button>
</div>
<ul id="list">
</ul>
</body>

＆＃13;

Answer 2

您要附加text，您需要附加listItem。看看这个：

您的代码：

list.appendChild(text);

应该如何：

list.appendChild(listItem);

最佳！

Answer 3

<section>：用于将不同的文章分组到不同的目的或主题，或定义单个文章的不同部分。 ref for more info

您可以将创建的列表元素添加到此<section> <ol> <li> tags的不同位置，如下所示。

var listItem = document.createElement("li"); // Create li element.
listItem.innerHTML = `taskInput`;

var list = document.getElementById("sectionlist");
list.appendChild(listItem);

＆＃13;

const button = document.getElementById('submit');
button.addEventListener ("click", () => {
	var taskInput = document.getElementById('task').value;

	if (taskInput !== '') {
		var listItem = document.createElement("li"); // Create li element.
		listItem.innerHTML = taskInput;

		var val = $("input[name='Radios']:checked").val();
    
		var list = document.getElementById("sectionlist");
		// https://stackoverflow.com/a/13166249/5081877
		var listCount = $("#sectionlist li").length;
		var xpath = '//section/ol/li['+listCount+']';
		if( val == "Option 1") {
     		list.appendChild(listItem);
		} else if ( val == "Option 2" ) {
			var element = document.evaluate(xpath, window.document, null, 9, null ).singleNodeValue;
			list.insertBefore(listItem, element);
		} else if ( val == "Option 3" ) {
			// https://stackoverflow.com/a/2470148/5081877
			var newElem = new XMLSerializer().serializeToString(listItem);
			list.insertAdjacentHTML('afterbegin', newElem);
		}
	} else {
		alert("You have to type a task!");
	}
});

＆＃13;

body {margin: 2em; font-family: Arial, Helvetica, sans-serif;}
span {
    /* style this span element so we can display nicely, this stlying is not neccessary */
    margin: 10px 0;
    display: block;
    width: 100%;
    float: left;
}

input[type="radio"] {
    /* hide the inputs */
    opacity: 0;
}

/* style your lables/button */
input[type="radio"] + label {
    /* keep pointer so that you get the little hand showing when you are on a button */
    cursor: pointer;
    /* the following are the styles */
    padding: 4px 10px;
    border: 1px solid #ccc;
    background: #efefef;
    color: #aaa;
    border-radius: 3px;
    text-shadow: 1px 1px 0 rgba(0,0,0,0);
}

input[type="radio"]:checked + label {
    /* style for the checked/selected state */
    background: #777;
    border: 1px solid #444;
    text-shadow: 1px 1px 0 rgba(0,0,0,0.4);
    color: white;
}

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<body>
<div id="myFORM">
  <h3>Insert Element into the DOM tree at a specified position.</h3>
  <span>
	<input id="Radio1" name="Radios" type="radio" value="Option 1" checked="checked">
	<label for="Radio1">Node.appendChild() - Insert as END Ele.</label>
  </span>
  <span>
	<input id="Radio2" name="Radios" type="radio" value="Option 2" >
	<label for="Radio2">Node.insertBefore() - Insert as Last but one Ele.</label>
  </span>
  <span>
	<input id="Radio3" name="Radios" type="radio" value="Option 3" >
	<label for="Radio3">Element.insertAdjacentHTML() - Insert as Start Ele.</label>
  </span>
</div>

<h1>Start your list!</h1>
<div class="input">
    <input type="text" id="task">
    <button id="submit">Create</button>
</div>

<section id="list">
  <ol id="sectionlist">
    <li>Default list Data</li>
  </ol>
</section>
</body>

＆＃13;

有关插入元素的更多信息，您可以refer my previous post。

@see

使用javascript创建新元素

3 个答案: