Detect Input

java script 偵測文字方塊輸入剩多少字：https://www.itread01.com/article/1535775467.html

判斷剩多少字能輸入：https://www.itread01.com/article/1423012706.html

圖書館簽到系統

判斷輸入數字位數

var maxstrlen = 6;

function Q(s) { return document.getElementById(s); }

function checkWord6(c) {

len = maxstrlen;

var str = c.value;

myLen = getStrleng(str);

var wck = Q("wordCheck6");

if (myLen > len) {

c.value = str.substring(0, i + 1);

}

else {

wck.innerHTML = "已經讀入" + Math.floor((myLen)) + "個數字。";

if (myLen == len){

wck.innerHTML = "[執行呼叫GAS]";

location.href = 'https://www.javascripttutorial.net/';

}

function getStrleng(str) {

myLen = 0;

i = 0;

for (; (i < str.length) && (myLen <= maxstrlen * 2); i++) {

if (str.charCodeAt(i) > 0 && str.charCodeAt(i) < 128)

myLen++;

else

myLen += 2;

}

return myLen;

}

</script>

</head>

<body>

<Tr><TD align="center"><h1>國立岡山高中圖書館K書中心簽到系統</h1></TD></Tr>

<caption>讀卡感應區_JavaScript</caption>

<tr>

</tr>

<ul>

<li>請感應學生證讀取學號。</li>

<li>收到系統通知信才是簽到成功。</li>

<li>維護自身權益確實簽到。</li>

</ul>

</td></tr>

</tr>

</table>

</TD>

</Tr>

</Table>

</form>

</body>

</html>

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