$(document).ready(function(){
$('#edit').css('min-height', $('#edit').height());
$('#edit').html('');
var currentHeight = $('#edit').height();
var lineHeight = currentHeight;
$('#edit').keyup(function(){
if($(this).height()!=currentHeight){
currentHeight = $(this).height();
var lines = currentHeight/lineHeight;
$('#nums').html('')
for (i = 1; i < lines+1; i++) {
$('#nums').append('<span>'+i+'</span>')
}
}
});
});
#container{
border: 2px solid gray;
display: flex;
width: 200px;
}
#nums{
width: 25px;
background-color: lightgrey;
}
#nums span{
width: 100%;
display: block;
text-align: center;
}
#edit{
display: inline-block;
width: 100%;
}
#editwrapper{
width: 100%;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="container">
<div id="nums">
<span>1</span>
</div>
<div id="editwrapper">
<div id="edit" contenteditable="true">
filler
</div>
</div>
</div>
实际上这并不简单。如果用户在您的 div 中输入文本并进行了换行,JavaScript 并不知道它已经换行了;因为没有行可以计数!
这个解决方案非常具体化,我会让你自己显示行号:
<div contenteditable="true" id="myDiv" style="width:300px;font-family:monospace" onchange="myHandler()"></div>
<script>
const limit = 40 // number of monospace chars to fill a row
let count = 0
function myHandler (e) {
let lines = Math.ceil(e.target.value.length / limit)
if (lines !== count) {
showlines(lines) // your function to display the line #s
count = lines
}
}
</script>
<li>
元素的<ol>
?表格?display:flex;
?display:grid;
? - StackSlave