動態顯示可輸入的字數提示還可以輸入的字數

複製代碼代碼如下:

<input name="title" type="text" size="50" value="{$p.title}" maxlength="15" onkeyup="javascript:setShowLength(this, 15, 'cost_tpl_title_length');"> <span id="cost_tpl_title_length">還可以輸入15字數</span>

js：

複製代碼代碼如下:

function setShowLength(obj, maxlength, id)

{

var rem = maxlength - obj.value.length;

var wid = id;

if (rem < 0){

rem = 0;

}

document.getElementById(wid).innerHTML = "還可以輸入" + rem + "字數";

}