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JS開發(fā)驗證表單教程之驗證表單(二)

上節(jié)我們說到了,驗證表單的內容是不是為空,為空我們給出提示信息

#那麼下面我們來看在表單文本框或者文本域輸入內容時,去除提示信息

首先我們想一下,文字方塊輸入內容,這個我們會觸發(fā)鍵盤事件

程式碼如下:

????????//當使用者名稱的文字方塊觸發(fā)鍵盤事件,提示資訊移除
?? ??? ?document.getElementById('name').onkeyup=function(){
?? ??? ??? ?document.getElementById('sp.).?? ?//當密碼框觸發(fā)鍵盤事件,提示訊息移除
?? ??? ?document.getElementById('pwd').onkeyup=function(){
?? ??? ????#10.# #????????//當郵箱文本框觸發(fā)鍵盤事件,提示信息去除

?? ???? document.getElementById('email').onkeyup=function(){
?? ??? ??? ?document.getElementById('sp2').innerHTML = " ";
?? ??? ?}
????????//當文字領域觸發(fā)鍵盤事件,提示訊息移除

?? ???? docum .getElementById(' sp3').innerHTML = " ";
?? ??? ?}

完整程式碼如下:

<!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>用戶名:</label>
            <input type="text" class="name" id="name">
            <div id="sp" class="div"></div>                
            <label>密&nbsp;碼:</label>
            <input type="password" class="pwd" id="pwd">
            <div id="sp1" class="div"></div>
            <label>郵&nbsp;箱:</label>
            <input type="text" class="email" id="email">
            <div id="sp2" class="div"></div>
            <label>愛&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="注冊" id="sub">
        </form>
    </div>

    <script type="text/javascript">
        var sub = document.getElementById('sub');
        sub.onclick=function(){
            //驗證用戶名是否為空,如果為空,給出提示信息
            var val = document.getElementById('name').value;
            if(val == ""){
                document.getElementById("sp").innerHTML = "請輸入用戶名!";
            }
            //驗證密碼是否為空,為空則給出提示信息
            var val1 = document.getElementById('pwd').value;
            if(val1 == ""){
                document.getElementById("sp1").innerHTML = "請輸入密碼!";
            }
            //驗證郵箱是否為空
            var val2 = document.getElementById('email').value;
            if(val2 == ""){
                document.getElementById("sp2").innerHTML = "請輸入郵箱!";
            }
            //驗證內容是否為空
            var val3 = document.getElementById('txt').value;
            if(val3 == ""){
                document.getElementById("sp3").innerHTML = "請輸入內容!";
            }            


        }
        //當用戶名的文本框觸發(fā)鍵盤事件,提示信息去除
        document.getElementById('name').onkeyup=function(){
            document.getElementById('sp').innerHTML = " ";
        }

        //當密碼框觸發(fā)鍵盤事件,提示信息去除
        document.getElementById('pwd').onkeyup=function(){
            document.getElementById('sp1').innerHTML = " ";
        }
        //當郵箱文本框觸發(fā)鍵盤事件,提示信息去除
        document.getElementById('email').onkeyup=function(){
            document.getElementById('sp2').innerHTML = " ";
        }
        //當文本域觸發(fā)鍵盤事件,提示信息去除
        document.getElementById('txt').onkeyup=function(){
            document.getElementById('sp3').innerHTML = " ";
        }
    </script>
</body>
</html>



繼續(xù)學習
||
<!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>用戶名:</label> <input type="text" class="name" id="name"> <div id="sp" class="div"></div> <label>密 碼:</label> <input type="password" class="pwd" id="pwd"> <div id="sp1" class="div"></div> <label>郵 箱:</label> <input type="text" class="email" id="email"> <div id="sp2" class="div"></div> <label>愛 好:</label> <textarea rows="5" cols="40" class="txt" id="txt"></textarea> <div id="sp3" class="div"></div> <input type="button" class="sub" value="注冊" id="sub"> </form> </div> <script type="text/javascript"> var sub = document.getElementById('sub'); sub.onclick=function(){ //驗證用戶名是否為空,如果為空,給出提示信息 var val = document.getElementById('name').value; if(val == ""){ document.getElementById("sp").innerHTML = "請輸入用戶名!"; } //驗證密碼是否為空,為空則給出提示信息 var val1 = document.getElementById('pwd').value; if(val1 == ""){ document.getElementById("sp1").innerHTML = "請輸入密碼!"; } //驗證郵箱是否為空 var val2 = document.getElementById('email').value; if(val2 == ""){ document.getElementById("sp2").innerHTML = "請輸入郵箱!"; } //驗證內容是否為空 var val3 = document.getElementById('txt').value; if(val3 == ""){ document.getElementById("sp3").innerHTML = "請輸入內容!"; } } //當用戶名的文本框觸發(fā)鍵盤事件,提示信息去除 document.getElementById('name').onkeyup=function(){ document.getElementById('sp').innerHTML = " "; } //當密碼框觸發(fā)鍵盤事件,提示信息去除 document.getElementById('pwd').onkeyup=function(){ document.getElementById('sp1').innerHTML = " "; } //當郵箱文本框觸發(fā)鍵盤事件,提示信息去除 document.getElementById('email').onkeyup=function(){ document.getElementById('sp2').innerHTML = " "; } //當文本域觸發(fā)鍵盤事件,提示信息去除 document.getElementById('txt').onkeyup=function(){ document.getElementById('sp3').innerHTML = " "; } </script> </body> </html>