php中的Ajax不起作用答案

【问题标题】：Ajax in php is not workingphp中的Ajax不起作用
【发布时间】：2011-05-24 05:12:12
【问题描述】：

/* 在下面的代码中有一个下拉列表，它必须在每次发生更改时调用该函数。此函数名称为 TotalCountsOfPL()。下拉列表是名称，Id 是“sltLeaveType”；

在调用文本框(AjxSelectedLeaveType) 的函数之后应该填充下拉列表的选定值。

并且文本框（AjxTakenLeave）应该填充数据库已经获取的计数。

我在我的项目中使用了 Ajax 概念。

那是关于 Dropdownlist 的变化，我正在调用函数（方法）。但这不起作用。

意味着当我选择下拉列表的内容时，所选数据（选项）应该显示在名为

的文本字段中

我的 html 文件是我在我的项目中使用了 Ajax 概念。

那是关于 Dropdownlist 的变化，我正在调用函数（方法）。但这不起作用。

我的html文件是

<html>
<head>
<script>
    function TotalCountsOfPL(str)
    {   
        if(iset(session_unregister("mySessionVariable")))
        {
            session_destroy();
        };       
        session_start();
        session_register("mySessionVariable");
        if(str!="")
        {
            $_SESSION["mySessionVariable"] = str;           
            document.getElementById("AjxSelectedLeaveType").innerHTML=str;
        }
        if (str=="")
        {
          document.getElementById("AjxTakenLeave").innerHTML="";
          //document.getElementById("AjxLeaveType").innerHTML="";
          return;
        }
        if (window.XMLHttpRequest)
        {// code for IE7+, Firefox, Chrome, Opera, Safari
            xmlhttp=new XMLHttpRequest();
        }
        else
        {// code for IE6, IE5
            xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
        xmlhttp.onreadystatechange=function()
        {
            if (xmlhttp.readyState==4 && xmlhttp.status==200)
            {
                document.getElementById("AjxTakenLeave").innerHTML=xmlhttp.responseText;
            }
        }

        xmlhttp.open("POST","getPLCount.php",true);
        xmlhttp.send();
    }
</script>
</head>
<body>
<?php
}

$prevEmployeeId= (isset($_POST['cmbEmployeeId'])) ? $_POST['cmbEmployeeId'] : "";
$prevLeaveFromDate = (isset($_POST['txtLeaveFromDate'])) ? $_POST['txtLeaveFromDate'] : "";
$prevLeaveToDate = (isset($_POST['txtLeaveToDate'])) ? $_POST['txtLeaveToDate'] : "";
$prevLeaveType = (isset($_POST['sltLeaveType'])) ? $_POST['sltLeaveType'] : "";
$prevToTime = (isset($_POST['sltLeaveToTime'])) ? $_POST['sltLeaveToTime'] : "";+
// Gnanendra .. Here I have consider the variable  $prevFromTime as "Total days" selected by the dropdownlist
$prevFromTime = (isset($_POST['sltLeaveFromTime'])) ? $_POST['sltLeaveFromTime'] : "";
//G Comment below
$prevTotalTime = (isset($_POST['txtLeaveTotalTime'])) ? $_POST['txtLeaveTotalTime'] : "";

$prevComments = (isset($_POST['txtComments'])) ? $_POST['txtComments'] : "";

$timeElementClass = (!empty($prevLeaveFromDate) && ($prevLeaveFromDate == $prevLeaveToDate)) ?
                        "show" : "hide";

$AjxSelectedLeaveType=(isset($_POST['AjxSelectedLeaveType'])) ? $_POST['AjxSelectedLeaveType'] : "";
$AjxTakenLeave=(isset($_POST['AjxTakenLeave'])) ? $_POST['AjxTakenLeave'] : "";
?>


<form id="frmLeaveApp" name="frmLeaveApp" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>?leavecode=Leave&amp;action=<?php 

echo $modifier; ?>">
<input type="hidden" value="<?php echo $token;?>" name="token" />
<?php if (isset($confirmDate)) { ?>
    <input type="hidden" name="confirmDate" value="<?php echo $prevLeaveFromDate; ?>"/>
<?php } ?>

    <?php if (isset($role)) { ?>
      <?php if(($role == authorize::AUTHORIZE_ROLE_ADMIN) || ($role == authorize::AUTHORIZE_ROLE_SUPERVISOR)){ ?>
        <label for="cmbEmployeeId"><?php echo $lang_Leave_Common_EmployeeName; ?><span class="required">*</span></label>
        <div>
        <input type="hidden" name="cmbEmployeeId" id="cmbEmployeeId" value="<?php echo isset($prevEmployeeId) ? $prevEmployeeId : ""; ?>" />


        <div class="yui-ac" id="employeeSearchAC" style="float: left">
        <input name="txtEmployeeId" autocomplete="off" class="yui-ac-input" id="txtEmployeeId" type="text" value="<?php echo isset($empName) ? 

CommonFunctions::escapeHtml($empName) : ""; ?>" tabindex="2" onfocus="showAutoSuggestTip(this)" style="color: #999999" />
              <div class="yui-ac-container" id="employeeSearchACContainer" style="top: 28px; left: 10px;">
              <div style="display: none; width: 159px; height: 0px; left: 100em" class="yui-ac-content">
              <div style="display: none;" class="yui-ac-hd"></div>
              <div class="yui-ac-bd">
                    <ul>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                        </ul>
                      </div>
                     <div style="display: none;" class="yui-ac-ft"></div>
                    </div>
                   <div style="width: 0pt; height: 0pt;" class="yui-ac-shadow"></div>
              </div>
        </div>
        </div>
        <br class="clear"/>
      <?php } ?>
    <?php } ?>

    <label for="sltLeaveType"><?php echo $lang_Leave_Common_LeaveType; ?></label>
    <select name="sltLeaveType" id="sltLeaveType" class="formSelect" onchange="TotalCountsOfPL(this.value)">
        <?php
            $skippedLeaveTypesCount = 0;

            if (is_array($records[1])) {
                foreach ($records[1] as $record) {
                    $className = get_class($record);

                    if ($className == 'LeaveQuota') {
                        if ($record->isLeaveQuotaDeleted()) {
                            $skippedLeaveTypesCount++;
                            continue;
                        }
                    }

                    $selected = ($record->getLeaveTypeID() == $prevLeaveType) ? 'selected="selected"' : "";
        ?>
            <option <?php echo $selected;?> value="<?php echo $record->getLeaveTypeID();?>"><?php echo $record->getLeaveTypeName(); 

?></option>
            <?php       }

                        if ($skippedLeaveTypesCount == count($records[1])) { ?>
                                <option value="-1">-- <?php echo $lang_Error_NoLeaveTypes; ?> --</option>
                        <?php }
                } else { ?>
            <option value="-1">-- <?php echo $lang_Error_NoLeaveTypes; ?> --</option>
            <?php } ?>
    </select>
    <br class="clear"/>
<!--Gnanendra Here the Leave date range will get-->
     <?php
        if (!(is_array($records[1])) && ($modifier == 'Leave_Apply')) {  ?>
            <div class="notice"><?php echo $lang_Leave_Common_LeaveQuotaNotAllocated; ?></div>
            <br class="clear"/>
     <?php } ?>

        <label for="txtLeaveFromDate"><?php echo $lang_Leave_Common_FromDate; ?><span class="required">*</span></label>

        <input name="txtLeaveFromDate" type="text" id="txtLeaveFromDate" size="10"
            value="<?php echo $prevLeaveFromDate; ?>" class="formDateInput"/>
          <input type="button" name="Submit" value="  " class="calendarBtn" id="btFromDate"/>
        <br class="clear"/>

        <label for="txtLeaveToDate"><?php echo $lang_Leave_Common_ToDate; ?><span class="required">*</span></label>
        <input name="txtLeaveToDate" type="text" id="txtLeaveToDate" size="10"
            value="<?php echo $prevLeaveToDate; ?>" class="formDateInput"/>

          <input type="button" name="Submit" value="  " class="calendarBtn" id="btToDate"/>
        <br class="clear"/>


      <div id="trTime1" class="<?php echo $timeElementClass;?>">
       <label for="sltLeaveFromTime"><?php echo $lang_Leave_Common_FromTime; ?></label> 
    <?php $lang_Leave_Common_FromTime="Total Days"; ?>
    <label for="sltLeaveFromTime"><?php echo $lang_Leave_Common_FromTime; ?></label>
    <select name="sltLeaveFromTime" id="sltLeaveFromTime" onchange="fillTimes();"
                class="formTimeSelect"> 
        <select name="sltLeaveFromTime" id="sltLeaveFromTime" onchange="FillTheDayLength();"
                class="formTimeSelect">
            <option value=""></option>
            <!-- It will the time to the drop downlist (00:00 to 23:59) -->

            <?php
                for ($i=$startTime; $i<=$endTime; $i+=$interval) {
                    $timeVal = date('H:i', $i);
                    $selected = ($timeVal == $prevFromTime) ? 'selected="selected"' : "";
            ?>
                    <option <?php echo $selected; ?> value="<?php echo $timeVal; ?>" ><?php echo LocaleUtil::getInstance()->formatTime($timeVal); 

?></option>
            <?php } ?>

           </select>

        <label for="sltLeaveToTime"><?php echo $lang_Leave_Common_ToTime; ?></label>
        <select name="sltLeaveToTime" id="sltLeaveToTime" onchange="fillTimes();"
                class="formTimeSelect">
            <option value=""></option>
            <?php
                for ($i=$startTime; $i<=$endTime; $i+=$interval) {
                    $timeVal = date('H:i', $i);
                    $selected = ($timeVal == $prevToTime) ? 'selected="selected"' : "";

                ?>
                    <option <?php echo $selected; ?> value="<?php echo $timeVal; ?>" ><?php echo LocaleUtil::getInstance()->formatTime($timeVal); 

?></option>
            <?php } ?>
            </select>
        <br class="clear"/>

        <label for="txtLeaveTotalTime"><?php echo $lang_Leave_Common_TotalHours; ?></label>
        <input name="txtLeaveTotalTime" id="txtLeaveTotalTime" size="4" onchange="fillTimes();"
                value="<?php echo $prevTotalTime; ?>" class="formInputText" style="width:3em;"/>

        <br class="clear"/>
      </div>
      <div id="trTime2" class="<?php echo $timeElementClass;?>">
      </div>

      <div id="trTime3" class="<?php echo $timeElementClass;?>">

      </div>
      <div id="trTime4" class="<?php echo $timeElementClass;?>">
      </div>
      <br class="clear"/>
      <label for="txtComments"><?php echo $lang_Leave_Common_Comment; ?></label>
      <textarea name="txtComments" id="txtComments" class="formTextArea" rows="3" cols="20"
        ><?php echo $prevComments;?></textarea>


<!-- -->


        <input name="AjxSelectedLeaveType" type="text" id="AjxSelectedLeaveType" size="30"
            value="<?php (isset($_POST['AjxSelectedLeaveType'])) ? $_POST['AjxSelectedLeaveType'] : "Leave Type";?>" class="formDateInput"/>

         <input name="AjxTakenLeave" type="text" id="AjxTakenLeave" size="30"
            value="<?php (isset($_POST['AjxTakenLeave'])) ? $_POST['AjxTakenLeave'] : "Taken Leave";?>" class="formDateInput"/>

<!-- -->
      <br class="clear"/>
        <div class="formbuttons">
            <input type="button" class="<?php echo $btnClass;?>" id="saveBtn"
                onclick="addSave();" onmouseover="moverButton(this);" onmouseout="moutButton(this);"
                value="<?php echo $btnTitle;?>" title="<?php echo $btnTitle;?>"/>
        </div>
</form>
</div>

</body>


And the Following is getPLCount.php


<?php

$q=$_POST["AjxSelectedLeaveType"];

$Eid=$_SESSION["mySessionVariable"];

$con = mysql_connect('localhost', 'gnuser', 'anu123');
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

mysql_select_db("My_Database", $con);

$EmployeeId= $q;

if (isset($q))
{
    $query = "select count(leave_request_id) from leave_requests
where leave_type_id='LTY002' AND employee_id=".$q.";";
}
if(isset($Eid))
{
    $query = "select count(leave_request_id) from leave_requests
where leave_type_id='LTY002' AND employee_id=".$Eid.";";
}

$result = mysql_query($query);

echo "document.getElementById("AjxTakenLeave").innerHTML={$result}";

mysql_close($con);
?>

请任何人告诉我为什么它不起作用。

【问题讨论】：

你能格式化你的代码吗？这绝对是不可读的。叹息……
我开始编辑然后改变主意，您包含的代码太多，修改它并只显示相关部分
将您的代码粘贴到ideone.com 并仅参考链接并描述您遇到的错误。没有人会对这么长的代码感兴趣。
我想如果我提供所有（完整）代码，那将有助于理解。
使用 JS 控制台，看看那里出了什么问题，我怀疑（但去所有的代码是令人困惑的，这里是清晨）php 和 js 的混合远非最佳（采取例如会话调用，$_SESSION["mySessionVariable"] 应该被回显，等等..)

标签： php ajax

【解决方案1】：

您正在将 PHP 与 JavaScript 混合使用。例如：

 if(str!="")
        {
            $_SESSION["mySessionVariable"] = str;           
            document.getElementById("AjxSelectedLeaveType").innerHTML=str;
        }

$_SESSION 是 PHP，document.getElementById 是 JavaScript。

Javascript 在客户端（即：浏览器）执行，PHP 在您的服务器上执行。你不能像那样混合它们。

【讨论】：

如果(str!="") { = str; 会起作用吗？ document.getElementById("AjxSelectedLeaveType").innerHTML=str; }
不，它不会 - str 是一个 js 变量，$_SESSION["mySessionVariable"] 是一个 PHP 变量。 $_SESSION 变量将由 PHP 评估，其 value 将到达您的 HTML。因此，在您的 HTML 中，您将拥有类似 if(str!="") { toto = str; document.getElementById("AjxSelectedLeaveType").innerHTML=str; } 的内容。其中toto 是$_SESSION["mySessionVariable"] 中保存的值。虽然，它可能会起作用 - 取决于你的意图

【解决方案2】：

您可能会收到一个错误 TotalCountsOfPL 函数，我认为（如果弄错了请纠正我）您正在尝试在 Javascript 函数中使用 PHP 函数。即会话功能。这是不合法的。我还注意到您的代码中有一个语法错误，在 body 标记之后，有一个 php 标记在它有一个 } 之后打开，但它没有在 php 上下文中的任何地方打开。我建议您将显示错误设置为 true 并使用 javascript 调试器，例如 firebug 或 dragonfly。

【讨论】：

【解决方案3】：

试试这个:)

<html>
<head>
<script>
    function TotalCountsOfPL(str)
    {   
        if(iset(session_unregister("mySessionVariable")))
        {
            session_destroy();
        };       
        session_start();
        session_register("mySessionVariable");
        if(str!="")
        {
            $_SESSION["mySessionVariable"] = str;           
            document.getElementById("AjxSelectedLeaveType").innerHTML=str;
        }
        if (str=="")
        {
          document.getElementById("AjxTakenLeave").innerHTML="";
          //document.getElementById("AjxLeaveType").innerHTML="";
          return;
        }
        if (window.XMLHttpRequest)
        {// code for IE7+, Firefox, Chrome, Opera, Safari
            xmlhttp=new XMLHttpRequest();
        }
        else
        {// code for IE6, IE5
            xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
        xmlhttp.onreadystatechange=function()
        {
            if (xmlhttp.readyState==4 && xmlhttp.status==200)
            {
                document.getElementById("AjxTakenLeave").innerHTML=xmlhttp.responseText;
            }
        }

        xmlhttp.open("POST","getPLCount.php",true);
        xmlhttp.send();
    }
</script>
</head>
<body>
<?php


$prevEmployeeId= (isset($_POST['cmbEmployeeId'])) ? $_POST['cmbEmployeeId'] : "";
$prevLeaveFromDate = (isset($_POST['txtLeaveFromDate'])) ? $_POST['txtLeaveFromDate'] : "";
$prevLeaveToDate = (isset($_POST['txtLeaveToDate'])) ? $_POST['txtLeaveToDate'] : "";
$prevLeaveType = (isset($_POST['sltLeaveType'])) ? $_POST['sltLeaveType'] : "";
$prevToTime = (isset($_POST['sltLeaveToTime'])) ? $_POST['sltLeaveToTime'] : "";+
// Gnanendra .. Here I have consider the variable  $prevFromTime as "Total days" selected by the dropdownlist
$prevFromTime = (isset($_POST['sltLeaveFromTime'])) ? $_POST['sltLeaveFromTime'] : "";
//G Comment below
$prevTotalTime = (isset($_POST['txtLeaveTotalTime'])) ? $_POST['txtLeaveTotalTime'] : "";

$prevComments = (isset($_POST['txtComments'])) ? $_POST['txtComments'] : "";

$timeElementClass = (!empty($prevLeaveFromDate) && ($prevLeaveFromDate == $prevLeaveToDate)) ?
                        "show" : "hide";

$AjxSelectedLeaveType=(isset($_POST['AjxSelectedLeaveType'])) ? $_POST['AjxSelectedLeaveType'] : "";
$AjxTakenLeave=(isset($_POST['AjxTakenLeave'])) ? $_POST['AjxTakenLeave'] : "";
?>


<form id="frmLeaveApp" name="frmLeaveApp" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>?leavecode=Leave&amp;action=<?php 

echo $modifier; ?>">
<input type="hidden" value="<?php echo $token;?>" name="token" />
<?php if (isset($confirmDate)) { ?>
    <input type="hidden" name="confirmDate" value="<?php echo $prevLeaveFromDate; ?>"/>
<?php } ?>

    <?php if (isset($role)) { ?>
      <?php if(($role == authorize::AUTHORIZE_ROLE_ADMIN) || ($role == authorize::AUTHORIZE_ROLE_SUPERVISOR)){ ?>
        <label for="cmbEmployeeId"><?php echo $lang_Leave_Common_EmployeeName; ?><span class="required">*</span></label>
        <div>
        <input type="hidden" name="cmbEmployeeId" id="cmbEmployeeId" value="<?php echo isset($prevEmployeeId) ? $prevEmployeeId : ""; ?>" />


        <div class="yui-ac" id="employeeSearchAC" style="float: left">
        <input name="txtEmployeeId" autocomplete="off" class="yui-ac-input" id="txtEmployeeId" type="text" value="<?php echo isset($empName) ? 

CommonFunctions::escapeHtml($empName) : ""; ?>" tabindex="2" onfocus="showAutoSuggestTip(this)" style="color: #999999" />
              <div class="yui-ac-container" id="employeeSearchACContainer" style="top: 28px; left: 10px;">
              <div style="display: none; width: 159px; height: 0px; left: 100em" class="yui-ac-content">
              <div style="display: none;" class="yui-ac-hd"></div>
              <div class="yui-ac-bd">
                    <ul>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                          <li style="display: none;"></li>
                        </ul>
                      </div>
                     <div style="display: none;" class="yui-ac-ft"></div>
                    </div>
                   <div style="width: 0pt; height: 0pt;" class="yui-ac-shadow"></div>
              </div>
        </div>
        </div>
        <br class="clear"/>
      <?php } ?>
    <?php } ?>

    <label for="sltLeaveType"><?php echo $lang_Leave_Common_LeaveType; ?></label>
    <select name="sltLeaveType" id="sltLeaveType" class="formSelect" onchange="TotalCountsOfPL(this.value)">
        <?php
            $skippedLeaveTypesCount = 0;

            if (is_array($records[1])) {
                foreach ($records[1] as $record) {
                    $className = get_class($record);

                    if ($className == 'LeaveQuota') {
                        if ($record->isLeaveQuotaDeleted()) {
                            $skippedLeaveTypesCount++;
                            continue;
                        }
                    }

                    $selected = ($record->getLeaveTypeID() == $prevLeaveType) ? 'selected="selected"' : "";
        ?>
            <option <?php echo $selected;?> value="<?php echo $record->getLeaveTypeID();?>"><?php echo $record->getLeaveTypeName(); 

?></option>
            <?php       }

                        if ($skippedLeaveTypesCount == count($records[1])) { ?>
                                <option value="-1">-- <?php echo $lang_Error_NoLeaveTypes; ?> --</option>
                        <?php }
                } else { ?>
            <option value="-1">-- <?php echo $lang_Error_NoLeaveTypes; ?> --</option>
            <?php } ?>
    </select>
    <br class="clear"/>
<!--Gnanendra Here the Leave date range will get-->
     <?php
        if (!(is_array($records[1])) && ($modifier == 'Leave_Apply')) {  ?>
            <div class="notice"><?php echo $lang_Leave_Common_LeaveQuotaNotAllocated; ?></div>
            <br class="clear"/>
     <?php } ?>

        <label for="txtLeaveFromDate"><?php echo $lang_Leave_Common_FromDate; ?><span class="required">*</span></label>

        <input name="txtLeaveFromDate" type="text" id="txtLeaveFromDate" size="10"
            value="<?php echo $prevLeaveFromDate; ?>" class="formDateInput"/>
          <input type="button" name="Submit" value="  " class="calendarBtn" id="btFromDate"/>
        <br class="clear"/>

        <label for="txtLeaveToDate"><?php echo $lang_Leave_Common_ToDate; ?><span class="required">*</span></label>
        <input name="txtLeaveToDate" type="text" id="txtLeaveToDate" size="10"
            value="<?php echo $prevLeaveToDate; ?>" class="formDateInput"/>

          <input type="button" name="Submit" value="  " class="calendarBtn" id="btToDate"/>
        <br class="clear"/>


      <div id="trTime1" class="<?php echo $timeElementClass;?>">
       <label for="sltLeaveFromTime"><?php echo $lang_Leave_Common_FromTime; ?></label> 
    <?php $lang_Leave_Common_FromTime="Total Days"; ?>
    <label for="sltLeaveFromTime"><?php echo $lang_Leave_Common_FromTime; ?></label>
    <select name="sltLeaveFromTime" id="sltLeaveFromTime" onchange="fillTimes();"
                class="formTimeSelect"> 

            <option value=""></option>
            <!-- It will the time to the drop downlist (00:00 to 23:59) -->

            <?php
                for ($i=$startTime; $i<=$endTime; $i+=$interval) {
                    $timeVal = date('H:i', $i);
                    $selected = ($timeVal == $prevFromTime) ? 'selected="selected"' : "";
            ?>
                    <option <?php echo $selected; ?> value="<?php echo $timeVal; ?>" ><?php echo LocaleUtil::getInstance()->formatTime($timeVal); 

?></option>
            <?php } ?>

           </select>

        <label for="sltLeaveToTime"><?php echo $lang_Leave_Common_ToTime; ?></label>
        <select name="sltLeaveToTime" id="sltLeaveToTime" onchange="fillTimes();"
                class="formTimeSelect">
            <option value=""></option>
            <?php
                for ($i=$startTime; $i<=$endTime; $i+=$interval) {
                    $timeVal = date('H:i', $i);
                    $selected = ($timeVal == $prevToTime) ? 'selected="selected"' : "";

                ?>
                    <option <?php echo $selected; ?> value="<?php echo $timeVal; ?>" ><?php echo LocaleUtil::getInstance()->formatTime($timeVal); 

?></option>
            <?php } ?>
            </select>
        <br class="clear"/>

        <label for="txtLeaveTotalTime"><?php echo $lang_Leave_Common_TotalHours; ?></label>
        <input name="txtLeaveTotalTime" id="txtLeaveTotalTime" size="4" onchange="fillTimes();"
                value="<?php echo $prevTotalTime; ?>" class="formInputText" style="width:3em;"/>

        <br class="clear"/>
      </div>
      <div id="trTime2" class="<?php echo $timeElementClass;?>">
      </div>

      <div id="trTime3" class="<?php echo $timeElementClass;?>">

      </div>
      <div id="trTime4" class="<?php echo $timeElementClass;?>">
      </div>
      <br class="clear"/>
      <label for="txtComments"><?php echo $lang_Leave_Common_Comment; ?></label>
      <textarea name="txtComments" id="txtComments" class="formTextArea" rows="3" cols="20"
        ><?php echo $prevComments;?></textarea>


<!-- -->


        <input name="AjxSelectedLeaveType" type="text" id="AjxSelectedLeaveType" size="30"
            value="<?php (isset($_POST['AjxSelectedLeaveType'])) ? $_POST['AjxSelectedLeaveType'] : "Leave Type";?>" class="formDateInput"/>

         <input name="AjxTakenLeave" type="text" id="AjxTakenLeave" size="30"
            value="<?php (isset($_POST['AjxTakenLeave'])) ? $_POST['AjxTakenLeave'] : "Taken Leave";?>" class="formDateInput"/>

<!-- -->
      <br class="clear"/>
        <div class="formbuttons">
            <input type="button" class="<?php echo $btnClass;?>" id="saveBtn"
                onclick="addSave();" onmouseover="moverButton(this);" onmouseout="moutButton(this);"
                value="<?php echo $btnTitle;?>" title="<?php echo $btnTitle;?>"/>
        </div>
</form>
</div>

</body>


And the Following is getPLCount.php


<?php

$q=$_POST["AjxSelectedLeaveType"];

$Eid=$_SESSION["mySessionVariable"];

$con = mysql_connect('localhost', 'gnuser', 'anu123');
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

mysql_select_db("My_Database", $con);

$EmployeeId= $q;

if (isset($q))
{
    $query = "select count(leave_request_id) from leave_requests
where leave_type_id='LTY002' AND employee_id=".$q.";";
}
if(isset($Eid))
{
    $query = "select count(leave_request_id) from leave_requests
where leave_type_id='LTY002' AND employee_id=".$Eid.";";
}

$result = mysql_query($query);

echo "document.getElementById('AjxTakenLeave').innerHTML={$result}";

mysql_close($con);
?>

【讨论】：

嗨@Hary，请告诉我您在哪里更改了代码。