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我有一个脚本，用户可以从数据库中找到练习，我有复选框供用户查找特定练习 当从每个复选框组中选择至少 1 个复选框时，该脚本可以正常工作，但是我希望如果没有选中任何复选框然后它将是所有复选框的结果。

我的复选框表单看起来像这样 

    <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" name="criteria">
    <p><strong>MUSCLE GROUP</strong></p>
    <input type="checkbox" name="muscle[]" id="abdominals" value="abdominals"/>Abdominals<br />
    <input type="checkbox" name="muscle[]" id="biceps" value="biceps" />Biceps<br />
    <input type="checkbox" name="muscle[]" id="calves" value="calves" />Calves<br />
     ect...
    <br /><p><strong>EQUIPMENT (please select a least one)</strong></p>
    <input type="checkbox" name="equipment[]" id="equipment" value="bands"/>Bands<br />
    <input type="checkbox" name="equipment[]" id="equipment" value="barbell" />Barbell<br />
    <input type="checkbox" name="equipment[]" id="equipment" value="dumbbell" />Dumbbell<br />
     ect....
    <input type="submit" name="sub" value="Generate Query" />
    </form>

这是我的脚本

     <?php

      if(isset($_POST['muscle']) && !empty($_POST['muscle'])){   
if(isset($_POST['equipment']) && !empty($_POST['equipment'])){   

//get the function
 include ($_SERVER['DOCUMENT_ROOT'] .'/scripts/functions.php');    
 $page = (int) (!isset($_GET["page"]) ? 1 : $_GET["page"]);
       $limit = 14;
       $startpoint = ($page * $limit) - $limit;

  // Runs mysql_real_escape_string() on every value encountered.
       $clean_muscle = array_map('mysql_real_escape_string', $_REQUEST['muscle']);
       $clean_equipment = array_map('mysql_real_escape_string', $_REQUEST['equipment']);

  // Convert the array into a string.
       $muscle = implode("','", $clean_muscle);
       $equipment = implode("','", $clean_equipment);

 $options = array();
       if(array($muscle))
       {
       $options[] = "muscle IN ('$muscle')";
       }
      if(array($equipment))
       {
      $options[] = "equipment IN ('$equipment')";
 }


      $fullsearch = implode(' AND ', $options);

      $statement = "mytable";
      if ($fullsearch <> '') {
      $statement .= " WHERE " . $fullsearch;
      }

     if(!$query=mysql_query("SELECT * FROM {$statement} LIMIT {$startpoint} , {$limit}"))
     {
     echo "Cannot parse query";
 }
 elseif(mysql_num_rows($query) == 0) {
 echo "No records found";
 }

else {
echo "";

while($row = mysql_fetch_assoc($query)) {
echo "".$row['name'] ."</br>           
            ".$row['description'] ."";
        }
    }
         echo "<div class=\"new-pagination\">";
        echo pagination($statement,$limit,$page);
        echo "</div>";
        }
    }

我是 php 新手，所以我的代码可能不是最好的。如果有人可以帮助我或指出我正确的方向，我将非常感激。

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1 回答 1

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好的-我想我已经弄清楚了。你是对的 - 主要问题在于你的isset和isempty电话。我在您的文件上创建了一些变体，这显示了正在发生的事情。注意 - 因为我没有你的一些“其他”功能，所以我只展示你的功能外部部分出了什么问题。

第 1 部分：验证函数

在下面的代码中，我在输入表单中添加了两个 JavaScript 函数；这些大致基于您在谷歌“JavaScript 验证复选框”时可以找到的脚本。该oneBoxSet(groupName)函数将查看所有文档元素；找到 type 的那些checkBox，看看其中一个是否被选中，如果是，则确认它属于groupName。目前，它返回“true”或“false”。调用函数validateMe(formName)运行您的验证。它是通过添加调用的

onclick="validateMe('criteria'); return false;"

到submit按钮的代码。这基本上是说“用这个参数调用这个函数来验证表单”。在这种情况下，函数“修复”数据并提交；但是您可以想象它返回“false”，在这种情况下，提交操作将被取消。

在validateMe函数中，我们检查每组中是否至少有一个框被选中；如果不是，则相应地设置“all[]”组中的隐藏框。

我稍微更改了代码——它调用了一个不同的脚本（muscle.php）而不是<?php echo $_SERVER['PHP_SELF']; ?>你的......显然原理是一样的。

在此初始代码之后，我们将查看我添加的一些内容，muscle.php以确认您最初的问题是什么。

<html>
<head>
<script type="text/javascript">

// go through all checkboxes; see if at least one with name 'groupName' is set
// if so, return true; otherwise return false
function oneBoxSet(groupName)
{
    var c=document.getElementsByTagName('input');
    for (var i = 0; i<c.length; i++){
        if (c[i].type=='checkbox')
        {
           if (c[i].checked) {
             if (c[i].name == groupName) {
               return true; // at least one box in this group is checked
               }
           }
        }
    }
    return false; // never found a good checkbox
}

function setAllBoxes(groupName, TF)
{
    // set the 'checked' property of all inputs in this group to 'TF' (true or false)
    var c=document.getElementsByTagName('input');
    // alert("setting all boxes for " + groupName + " to " + TF);
    for (var i = 0; i<c.length; i++){
        if (c[i].type=='checkbox')
        {
            if (c[i].name == groupName) {
            c[i].checked = TF;
            }
        }
    }
    return 0;
}

// this function is run when submit is pressed:
function validateMe(formName) {
  if (oneBoxSet('muscle[]')) {
    document.getElementById("allMuscles").value = "selectedMuscles";
    //alert("muscle OK!");
    } 
  else { 
    document.getElementById("allMuscles").value = "allMuscles";
    // and/or insert code that sets all boxes in this group:
    setAllBoxes('muscle[]', true);
    alert("No muscle group was selected - has been set to ALL");
    }
  if (oneBoxSet('equipment[]')) {
    document.getElementById("allEquipment").value = "selectedEquipment";
    //alert("equipment OK!");
    }
  else  {
    document.getElementById("allEquipment").value = "allEquipment";
    // instead, you could insert code here that sets all boxes in this category to true
    setAllBoxes('equipment[]', true);
    alert("No equipment was selected - has been set to ALL");
    }
  // submit the form - function never returns
  document.forms[formName].submit();  
}

</script>
</head>

<body>
    <form action="muscle.php" method="post" name="criteria">
        <p><strong>MUSCLE GROUP</strong></p>
        <input type="checkbox" name="muscle[]" id="abdominals" value="abdominals"/>Abdominals<br />
        <input type="checkbox" name="muscle[]" id="biceps" value="biceps" />Biceps<br />
        <input type="checkbox" name="muscle[]" id="calves" value="calves" />Calves<br />
        <input type="hidden"   name="all[]" id="allMuscles" value="selectedMuscles" />
        etc...<br>
        <br /><p><strong>EQUIPMENT (please select a least one)</strong></p>
        <input type="checkbox" name="equipment[]" id="equipment" value="bands"/>Bands<br />
        <input type="checkbox" name="equipment[]" id="equipment" value="barbell" />Barbell<br />
        <input type="checkbox" name="equipment[]" id="equipment" value="dumbbell" />Dumbbell<br />
        <input type="hidden"   name="all[]" id="allEquipment" value="selectedEquipment" />
        <br>
        <input type="submit" name="sub" value="Generate Query" onclick="validateMe('criteria'); return false;" />
    </form>
</body>
</html>

第 2 部分：PHP 出了什么问题？

现在这是 php 脚本的新开始。它检查您在原始脚本开始时测试的条件，并演示if如果未在其中一个组中设置复选框，您永远不会超过初始语句。我建议您完全放弃这些测试，而是从我编写的代码中获取灵感来解决任何问题。例如，您可以测试是否equipmentAll已muscleAll设置，并相应地创建适当的查询字符串。

<?php

    echo 'file was called successfully<br><br>';
    if(isset($_POST['muscle'])) {
       echo "_POST[muscle] is set<br>";
       print_r($_POST[muscle]);
       echo "<br>";

       if (!empty($_POST['muscle'])) {
         echo "_POST[muscle] is not empty!<br>";
         }
         else {
         echo "_POST[muscle] is empty!<br>";
         }
         }
    else {
      echo "_POST[muscle] is not set: it is empty!<br>";
    }
    if(isset($_POST['equipment'])) {
       echo "_POST[equipment] is set<br>";
       print_r($_POST['equipment']);
       echo "<br>";

       if (!empty($_POST['equipment'])) {
         echo "_POST[equipment] is not empty!<br>";
         }
         else {
         echo "_POST[equipment] is empty!<br>";
         }
         }
    else {
      echo "_POST[equipment] is not set: it is empty!<br>";
    }

    if(isset($_POST['all'])) {
      echo "this is what you have to do:<br>";
      print_r($_POST['all']);
      echo "<br>";
      }


//    if(isset($_POST['muscle']) && !empty($_POST['muscle'])){
//        if(isset($_POST['equipment']) && !empty($_POST['equipment'])){

如果你在没有选中复选框的情况下调用它，你会得到两个对话框（'not OK!'），然后是以下输出：

file was called successfully

_POST[muscle] is not set: it is empty!
_POST[equipment] is not set: it is empty!  
this is what you have to do:  
Array ( [0] => allMuscles [1] => allEquipment )

如果您在第一组中选择了几个框，而在第二组中没有选择：

file was called successfully

_POST[muscle] is set
Array ( [0] => abdominals [1] => calves )
_POST[muscle] is not empty!
_POST[equipment] is not set: it is empty!
this is what you have to do:
Array ( [0] => selectedMuscles [1] => allEquipment )

我并没有声称自己写出了漂亮的代码；但我希望这是功能性的，能让你摆脱你所处的修复状态。祝你好运！

于 2013-04-18T05:07:10.653 回答