Tutorial borang pengesahan pembangunan JS - borang pengesahan (3)

Mari kita lihat perkara berikut, sahkan nama pengguna

Kami berkata sebelum ini bahawa pengesahan nama pengguna tidak boleh kosong

Sekarang mari sahkan panjang nama pengguna dan berikan nilai panjang , dalam nilai panjang, ia betul, jika ia melebihi panjang atau kurang daripada panjang, ia adalah nama pengguna yang tidak sah

Mari tulis kod di bawah:

//Sahkan sama ada nama pengguna kosong, jika Jika kosong, mesej gesaan
akan diberikan var val = document.getElementById('name').value;
var rel = document.getElementById('name') .value.length;
if(val = = "") { Document.GetelementByid ("sp"). ; = 5 ||. Rel & gt; 10) {<🎜) {<🎜) > document.getElementById("sp").innerHTML = "Formatnya salah!";
}

Mula-mula kita mendapatkan panjang dan menilai panjang, iaitu kurang daripada atau sama dengan 5 atau lebih besar daripada 10. Petua

Kod lengkap adalah seperti berikut:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title></title>
    <style type="text/css">
        *{margin:0;padding:0;}
        #div{width:410px;height:400px;background:#46a3ff;padding-left:16px;
            padding-top:20px;}
        input{
            outline:none;
            box-sizing:border-box;padding-left:15px;}
        textarea{
            outline:none;resize : none;
            box-sizing:border-box;padding-left:15px;padding-top:5px;}
        .name{width:200px;height:30px;margin-left:8px;border:1px solid #ffc1e0;border-radius:8px;}
        .pwd{width:200px;height:30px;
            margin-left:8px;border:1px solid #ffc1e0;border-radius:8px;}
        .email{width:200px;height:30px;margin-left:8px;border:1px solid #ffc1e0;border-radius:8px;}
        .txt{
            width:280px;height:70px;margin-left:8px;border:1px solid #ffc1e0;border-radius:8px;}
        .sub{width:100px;height:30px;padding-left:0px;
            border:none;
            border-radius:5px;background:#ffd0ff;}
        .sub:hover{background:#ffaad5;}
        .div{
            width:200px;height:30px;margin:0 auto;box-sizing:border-box;padding-left:45px;padding-top:5px;color:#8600ff;font-weight:bold;}

    </style>
</head>
<body>
    <div id="div">
        <form>
            <label>用户名:</label>
            <input type="text" class="name" id="name">
            <div id="sp" class="div"></div>                
            <label>密&nbsp;码:</label>
            <input type="password" class="pwd" id="pwd">
            <div id="sp1" class="div"></div>
            <label>邮&nbsp;箱:</label>
            <input type="text" class="email" id="email">
            <div id="sp2" class="div"></div>
            <label>爱&nbsp;好:</label>
            <textarea rows="5" cols="40" class="txt" id="txt"></textarea>
            <div id="sp3" class="div"></div>
            <input type="button" class="sub" value="注册" id="sub">
        </form>
    </div>

    <script type="text/javascript">
        var sub = document.getElementById('sub');
        sub.onclick=function(){
            //验证用户名是否为空,如果为空，给出提示信息
            var val = document.getElementById('name').value;
            var rel = document.getElementById('name').value.length;
            //console.log(val.length);
            if(val == ""){
                document.getElementById("sp").innerHTML = "用户名不能为空！";
            }else if( rel <= 5 || rel > 10){
                document.getElementById("sp").innerHTML = "格式不正确！";
            }
            //验证密码是否为空，为空则给出提示信息
            var rel = /^[A-Za-z0-9]{6,10}$/;
            var val1 = document.getElementById('pwd').value;
            if(val1 == ""){
                document.getElementById("sp1").innerHTML = "请输入密码！";
            }
            //验证邮箱是否为空和邮箱的格式是否正确
            var val2 = document.getElementById('email').value;
            if(val2 == ""){
                document.getElementById("sp2").innerHTML = "请输入邮箱！";
            }
            //验证内容是否为空
            var val3 = document.getElementById('txt').value;
            if(val3 == ""){
                document.getElementById("sp3").innerHTML = "请输入内容！";
            }
        }

            //当用户名的文本框触发键盘事件，提示信息去除
            document.getElementById('name').onkeyup=function(){
                document.getElementById('sp').innerHTML = " ";
            }
            // //当密码框触发键盘事件，提示信息去除
            document.getElementById('pwd').onkeyup=function(){
                document.getElementById('sp1').innerHTML = " ";
            }
            // //当邮箱文本框触发键盘事件，提示信息去除
            document.getElementById('email').onkeyup=function(){
                document.getElementById('sp2').innerHTML = " ";
            }
            // //当文本域触发键盘事件，提示信息去除
            document.getElementById('txt').onkeyup=function(){
                document.getElementById('sp3').innerHTML = " ";
            }            

    </script>
</body>
</html>

Dengan cara ini , pengesahan nama pengguna kami telah selesai

Meneruskan pembelajaran

fail baharu

<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <style type="text/css"> *{margin:0;padding:0;} #div{width:410px;height:400px;background:#46a3ff;padding-left:16px; padding-top:20px;} input{ outline:none; box-sizing:border-box;padding-left:15px;} textarea{ outline:none;resize : none; box-sizing:border-box;padding-left:15px;padding-top:5px;} .name{width:200px;height:30px;margin-left:8px;border:1px solid #ffc1e0;border-radius:8px;} .pwd{width:200px;height:30px; margin-left:8px;border:1px solid #ffc1e0;border-radius:8px;} .email{width:200px;height:30px;margin-left:8px;border:1px solid #ffc1e0;border-radius:8px;} .txt{ width:280px;height:70px;margin-left:8px;border:1px solid #ffc1e0;border-radius:8px;} .sub{width:100px;height:30px;padding-left:0px; border:none; border-radius:5px;background:#ffd0ff;} .sub:hover{background:#ffaad5;} .div{ width:200px;height:30px;margin:0 auto;box-sizing:border-box;padding-left:45px;padding-top:5px;color:#8600ff;font-weight:bold;} </style> </head> <body> <div id="div"> <form> <label>用户名:</label> <input type="text" class="name" id="name"> <div id="sp" class="div"></div> <label>密码:</label> <input type="password" class="pwd" id="pwd"> <div id="sp1" class="div"></div> <label>邮箱:</label> <input type="text" class="email" id="email"> <div id="sp2" class="div"></div> <label>爱好:</label> <textarea rows="5" cols="40" class="txt" id="txt"></textarea> <div id="sp3" class="div"></div> <input type="button" class="sub" value="注册" id="sub"> </form> </div> <script type="text/javascript"> var sub = document.getElementById('sub'); sub.onclick=function(){ //验证用户名是否为空,如果为空，给出提示信息 var val = document.getElementById('name').value; var rel = document.getElementById('name').value.length; //console.log(val.length); if(val == ""){ document.getElementById("sp").innerHTML = "用户名不能为空！"; }else if( rel <= 5 || rel > 10){ document.getElementById("sp").innerHTML = "格式不正确！"; } //验证密码是否为空，为空则给出提示信息 var rel = /^[A-Za-z0-9]{6,10}$/; var val1 = document.getElementById('pwd').value; if(val1 == ""){ document.getElementById("sp1").innerHTML = "请输入密码！"; } //验证邮箱是否为空和邮箱的格式是否正确 var val2 = document.getElementById('email').value; if(val2 == ""){ document.getElementById("sp2").innerHTML = "请输入邮箱！"; } //验证内容是否为空 var val3 = document.getElementById('txt').value; if(val3 == ""){ document.getElementById("sp3").innerHTML = "请输入内容！"; } } //当用户名的文本框触发键盘事件，提示信息去除 document.getElementById('name').onkeyup=function(){ document.getElementById('sp').innerHTML = " "; } // //当密码框触发键盘事件，提示信息去除 document.getElementById('pwd').onkeyup=function(){ document.getElementById('sp1').innerHTML = " "; } // //当邮箱文本框触发键盘事件，提示信息去除 document.getElementById('email').onkeyup=function(){ document.getElementById('sp2').innerHTML = " "; } // //当文本域触发键盘事件，提示信息去除 document.getElementById('txt').onkeyup=function(){ document.getElementById('sp3').innerHTML = " "; } </script> </body> </html>

serahkan Tetapkan Semula Kod

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