標籤：mat ott innerhtml lag height div class har post
<html>
<head>
<title>js判斷輸入字串長度（漢字算兩個字元，字母數字算一個）</title>
<style type="text/css">
.pbt {
margin-bottom: 10px;
}
.ie6 .pbt .ftid a, .ie7 .pbt .ftid a {
margin-top: 1px;
}
.cl:after {
clear: both;
content: ".";
display: block;
height: 0;
visibility: hidden;
}
</style>
<script type="text/javascript">
//擷取字串長度（漢字算兩個字元，字母數字算一個）
function getByteLen(val) {
var len = 0;
for (var i = 0; i < val.length; i++) {
var a = val.charAt(i);
if (a.match(/[^\x00-\xff]/ig) != null) {
len += 2;
}
else {
len += 1;
}
}
return len;
}
// 只要鍵盤一抬起就驗證編輯框中的文字長度，最大字元長度可以根據需要設定
function checkLength(obj) {
var maxChars = 80;//最多字元數
var curr = maxChars - getByteLen(obj.value);
if (curr > 0) {
document.getElementById("checklen").innerHTML = curr.toString();
} else {
document.getElementById("checklen").innerHTML = ‘0‘;
document.getElementById("subject").readOnly = true;
}
}
</script>
</head>
<body>
<div class="pbt cl">
<textarea id="subject" maxlength="80" onkeyup="checkLength(this)" accesskey="1" tabindex="11"></textarea>
<span id="subjectchk">還可輸入
<strong id="checklen" style="color: #FF0000">80</strong>
個字元
</span>
<span id="postNameRule" class="spn_flag_1" style="display: none"></span>
</div>
</body>
</html>
js輸入文字長度判斷
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