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我无法找到解决方案(或者我错过了它),所以我尝试从您那里获得答案。未捕获的类型错误无法读取未定义的属性'长度'
我有以下的html:
<input name="title" type="text" id="title" size="69" maxlength="30" onmouseout="CheckFieldLength(title, 'charcount2', 'remaining2', 30);" onkeydown="CheckFieldLength(title, 'charcount2', 'remaining2', 30);" onkeyup="CheckFieldLength(title, 'charcount2', 'remaining2', 30);"/></td>
我试图让输入字段的字符长度如下:
<span id="charcount2">0</span> characters entered | <span id="remaining2">140</span> characters remaining
JS文件在以下做技巧:
function CheckFieldLength(fn,wn,rn,mc) {
var len = fn.value.length;
if (len > mc) {
fn.value = fn.value.substring(0,mc);
len = mc;
}
document.getElementById(wn).innerHTML = len;
document.getElementById(rn).innerHTML = mc - len;
}
但是,我只是不断收到以下错误:
uncaught typeerror cannot read property 'length' of undefined
你有什么想法如何解决这个问题?
谢谢,这只是工作真棒! :) – 2014-09-01 23:43:37