注意:我尝试了所有的问题&； 与此主题相关的答案。
我想根据文本区的高度和宽度限制字符数。 假设我已经设置了Textareaheight:50px和widted:60px；，所以我希望在完成Textarea之后防止字符。
注意:按文本区域高度和宽度设置最大字符数。
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.textareaClass {
height: 50px;
width: 60px;
resize: none;
overflow: hidden
}<textarea class="textareaClass"></textarea>null
我创建了一个代码，查看文本区域的宽度和高度适合多少字符，并根据这个数字设置文本区域的最大长度
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$('.textareaClass').keypress(function(){
let width = $(this).css('width').replace(/[^-\d\.]/g, ''); //getting the width of textarea
let height = $(this).css('height').replace(/[^-\d\.]/g, '');//getting the height of textarea
let widthchar = Math.floor(parseInt(width) / 7.5);//based on the width howmuch characters fit sideways
let heightchar = Math.floor(parseInt(height) / 15);//based on the height, howmuch lines of characters are there
let totalchar = widthchar * heightchar; //multiply lines by chars sideways to get a total amount of chars
$(this).attr('maxlength',totalchar);//setting the total as total for the text area
$(".char").html('you are allowed to type:'+ totalchar+'character(s)');//output to see howmuch you can type, just for debug/programming reasons to see what's happening
});.textareaClass {
height:100px;
width: 50px;
resize: none;
overflow: hidden
}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<textarea class="textareaClass"></textarea>
<div class="char">
</div>
可以将高度和宽度属性设置为ch（字符）单位。 并将maxlength=“（width）*（height/line-height）”属性设置为textarea。
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.textareaClass {
height: 10ch;
width: 10ch;
line-height: 2ch;
resize: none;
overflow: hidden
}<!-- max-length should be 10 (width) * 10 (height) / 2 (line-height) = 10 * 5 = 50 -->
<textarea class="textareaClass" maxlength="50"></textarea>