當字元計數器達到 100 時顯示按鈕
嘗試做一個測驗頁面，我需要在文字區域中寫入最少字元數後顯示「提交」按鈕。這是我嘗試過但無法使其發揮作用的方法。
<textarea name="tweet" id="textbox"
rows="13" cols="70" placeholder="" maxlength="250"></textarea><br>
<span id="char_count">0/250</span>
<script>
let textArea = document.getElementById("textbox");
let characterCounter = document.getElementById("char_count");
const minNumOfChars = 0;
const maxNumOfChars = 250;
var text = document.getElementById("buton");
const countCharacters = () => {
let numOfEnteredChars = textArea.value.length;
let counter = minNumOfChars + numOfEnteredChars;
characterCounter.textContent = counter + "/250";
};
textArea.addEventListener("input", countCharacters);
if (counter > 100 ) {
text.style.display = "block";
}
else {
}
</script>
<br><br><br>
<div>
<button class="NextStep" id="buton" style="display:none"
onclick="NextStep()">Finalizare Curs</button>
</div>
<script>
function NextStep() {
location.href =("Cursuri.html")
}
</script>