Question

下面是一些简单表单上的javascript验证。我第一次点击提交验证将起作用，以及消息和错误消息。如果我收到错误，请输入仍然不正确的新值并再次点击提交，验证将不再起作用，并将值传递给我的php表单。

这是javascript

<script type="text/javascript" language="javascript"> 
<!--
function validateMyForm ( ) { 
    var isValid = true;
    if ( document.form1.gamedate.value === "Select One" ) { 
            document.getElementById("errorMessage").innerHTML = ( "Please select a game" ); 
            isValid = false;
    } else if ( document.form1.wteam.value === "Select One" ) { 
            document.getElementById("errorMessage").innerHTML = ( "Please select the winning team" ); 
            isValid = false;
    } else if ( document.form1.wscore.value === "Select One" ) { 
            document.getElementById("errorMessage").innerHTML = ( "Please select the winning score" ); 
            isValid = false;
    } else if ( document.form1.lscore.value === "Select One" ) {
            document.getElementById("errorMessage").innerHTML = ( "Please select the losing score");
            isValid = false;
    } else if ( document.form1.wscore.value <= document.form1.lscore.value ){
            document.getElementById("errorMessage").innerHTML = ( "Winning score must be larger than the losing score");
            isValid = false;
    }
    return isValid;
}
//-->
</script>

带有*******的php表单删除某些数据

<form action="*********" method="post" name="form1">
      <div class="form-group">
           <label>Game Date:</label>
           <select name="gamedate">
               <option>Select One</option>
               <?php
               $stmt = $db->prepare("***********)");
               $stmt->execute(array(':**********' => $_SESSION['**********']));
                 while($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
                 echo '<option value="';
                 echo $row['*********'];
                 echo '">';
                 echo $row['*********'];
                 echo '</option>';
                 }
               ?>
           </select>
      </div>
      <div class="form-group">
           <label>Winning Team</label>
           <select name="wteam">
               <option>Select One</option>
               <option value="1">Home</option>
               <option value="0">Opponent</option>
           </select>
       </div>
       <div class="form-group">
            <label>Winning Score</label>
            <select name="wscore">
                <option>Select One</option>
                <option value="1">1</option>
                <option value="2">2</option>
                <option value="3">3</option>
                <option value="4">4</option>
                <option value="5">5</option>
                <option value="6">6</option>
                <option value="7">7</option>
                <option value="8">8</option>
                <option value="9">9</option>
                <option value="10">10</option>
                <option value="11">11</option>
                <option value="12">12</option>
                <option value="13">13</option>
                <option value="14">14</option>
                <option value="15">15</option>          
            </select>
       </div>
       <div class="form-group">
            <label>Losing Score</label>
            <select name="lscore">
                <option>Select One</option>
                <option value="0">0</option>
                <option value="1">1</option>
                <option value="2">2</option>
                <option value="3">3</option>
                <option value="4">4</option>
                <option value="5">5</option>
                <option value="6">6</option>
                <option value="7">7</option>
                <option value="8">8</option>
                <option value="9">9</option>
                <option value="10">10</option>
                <option value="11">11</option>
                <option value="12">12</option>
                <option value="13">13</option>
                <option value="14">14</option>
                <option value="15">15</option>  
            </select>
       </div>
       <div class="form-group">
       <input type="submit" value="Submit" onclick="javascript:return validateMyForm();">      
</form>

对我做错了什么的想法？

Answer 1

您的验证功能是从错误的地方调用的。它应该从表单onsubmit方法调用，而不是提交按钮的onclick方法：

<form action="*********" method="post" name="form1" onsubmit="return validateMyForm()">

Answer 2

您正试图获取javascript中下拉列表的值，但之后您将其与下拉列表中的文本进行比较。将值分配给默认下拉选项并与之进行比较，或者更改您的javascript以获取文本（例如“选择一个”）。

Answer 3

Javascript验证非常棒，但您也应该在PHP表单处理程序中执行相同的验证步骤。然后，如果它没有从PHP表单处理程序传递验证，则会再次重定向到包含表单的页面。优先预填充有效字段并注意哪些字段需要更正。

Javascript验证应被视为ADD-ON到服务器端验证。

@danl这是一些基本的PHP验证。我不确定你的gamedate变量应该用什么格式来检查它。其他是非常基本的。

$haserror=false;

$gamedate=$_POST['gamedate'];
//not sure what is valid for gamedate.  But you should check it against something
if(strlen($gamedate)<1){
    $haserror=true;
    $errordetail.=' Game Date must be selected';
}

$wteam=$_POST['wteam'];
if(!(($wteam==1) || ($wteam==0))){
    $haserror=true;
    $errordetail.=' Winning team must be selected';
}

$wscore=$_POST['wscore'];
if(!is_numeric($wscore)){
    $haserror=true;
    $errordetail.=' Winning score does not appear to be a valid number';
}
$lscore=$_POST['lscore'];
if(!is_numeric($lscore)){
    $haserror=true;
    $errordetail.=' Losing score does not appear to be a valid number';
}

if($lscore > $wscore){
    $haserror=true;
    $errordetail.=' Losing score should not be more than the winning score.';
}

if($haserror){
   echo $errordetail;
   exit();
}
else{
   echo'  Success! .  Process the data here';
}

使用PHP进行Javascript客户端验证

3 个答案: