我們先把上一節的程式碼拿出來看看
<!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> </body> </html>
我們先來看一下驗證使用者名稱:
var sub = document.getElementById('sub');
sub.onclick=function(){
//驗證使用者名稱是否為空,若為空,給予提示訊息## if(val == ""){
document.getElementById("sp").innerHTML = "請輸入使用者名稱!";## 來# 接收按鈕這個對象,然後做一個單擊事件
獲取文本框的值,然後對文本框的值進行判斷,如果等於空,我們給出提示信息,提示信息存放在div 標籤內
其實我們寫完了一個大致也就明白了,剩下的幾個文字方塊和文字網域的驗證就很簡單了
程式碼如下:
var sub = document.getElementById('sub');
sub.onclick=function(){
val = document。 }
//驗證密碼是否為空,為空則給予提示訊息
var val1 = document.getElementById('pwd # # document.getElementById("sp1").innerHTML = "請輸入密碼!";
# var val2 = document.getElementById('email').value;
if(val2 == ""){
document.getElementBy, //驗證內容是否為空白
# var val3 = document.getElementById('txt').value;
if(val3 == ""){
}
}
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; if(val == ""){ document.getElementById("sp").innerHTML = "请输入用户名!"; } //验证密码是否为空,为空则给出提示信息 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 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!"; } } </script> </body> </html>下一節