JS judgment cannot be empty instance code

  • 2020-03-30 00:00:11
  • OfStack

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
        <meta http-equiv="Content-Type" content="text/html"; charset="utf-8">
        <title> SMS system </title>
<script language="javascript">        
        function formcheck(){
                alert(" The number cannot be empty! ");
                return false;
            }else if(document.form.email.value==""){
                alert(" The content cannot be empty! ")
                return false;
            }else form1.submit();  

        <form name="form" method="post" action="sendmail.php" class="formg">
                        <th colspan="8" class="CTitle"> Send a text message </th>


                        <tr bgcolor="#eeeeee">
                            <td align="center"> No.     code :</td>
                            <td><textarea name="content" cols="80" rows="15" id="zhanghao" class="formh"></textarea></td>
                        <tr bgcolor="#eeeeee">
                            <td align="center"> Within the     let :</td>
                            <td><textarea name="content" cols="80" rows="15" id="email" class="formh"></textarea></td>

                        <tr bgcolor="#eeeeee" align="center"> 
                <td height="25" colspan="2"> 
                    <input type="button" name="Submit" value=" hair   send " class="button" onClick="javascript : formcheck();">      
                    <input type="reset" name="Submit2" value=" heavy   buy " class="button">

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