我试着把required放在我的文本区域。但它不起作用，因为我的onclick="displayText()"函数会立即执行。如何要求先填写我的文本区域而不立即执行 onclick？这是我的代码：
.HTML：
<!DOCTYPE html>
<html>
<head>
<title>Word Counter</title>
</head>
<body>
<div id="input-page">
<h1>Word Counter</h1>
<form action="">
<textarea id="inputted-text" type="text" rows="22" cols="60"></textarea>
<br />
</form>
<button onclick="displayText()">COUNT</button>
</div>
<div id="count-page" style="display: none;">
<h1>Your Text:</h1>
<p id=display-user-text></p>
<div>
<h1 id="word-count">Count: </h1>
</div>
</div>
</body>
<script src="app.js"></script>
</html>
JavaScript：
const displayText = () => {
const inputPage = document.getElementById("input-page");
const countPage = document.getElementById("count-page");
inputPage.style.display = "none";
// get user's inputted text
const inputtedText = document.getElementById("inputted-text");
const inputtedTextValue = inputtedText.value;
// diplay user's inputted text
document.getElementById("display-user-text").innerText = inputtedTextValue;
countPage.style.display = "block";
console.log(countWords(inputtedTextValue));
};
const countWords = (str) => {
return str.split(" ").length;
};
const renderWordCount = () => {
document.getElementById("word-count") = wordCount;
};
奖金： 除了Count:标题之外，如何显示字数，而不仅仅是将其放在控制台上？
您希望系统在文本区域为空时发出警告。您可以通过向代码中添加 If-else 条件表达式来执行此操作。
const displayText = () => {
const inputPage = document.getElementById("input-page");
const countPage = document.getElementById("count-page");
const inputtedText = document.getElementById("inputted-text");
const inputtedTextValue = inputtedText.value;
if (inputtedText.value !== "") { // normal flow will continue if the text-area is not empty
inputPage.style.display = "none";
document.getElementById("display-user-text").innerText = inputtedTextValue;
countPage.style.display = "block";
} else { // if the text-area is empty, it will issue a warning.
alert("this area required")
}
console.log(countWords(inputtedTextValue));
};
const countWords = (str) => {
return str.split(" ").length;
};
const renderWordCount = () => {
document.getElementById("word-count") = wordCount;
};<div id="input-page">
<h1>Word Counter</h1>
<form action="">
<textarea id="inputted-text" type="text" rows="22" cols="60"></textarea>
<br />
</form>
<button onclick="displayText()">COUNT</button>
</div>
<div id="count-page" style="display: none;">
<h1>Your Text:</h1>
<p id="display-user-text"></p>
<div>
<h1 id="word-count">Count: </h1>
</div>
</div>