在 onchange 上调用 2 个 JS 函数，并且都返回一些值

我想在onchange事件上调用两个JS函数，两个函数都返回一些值。它没有给我第二个函数输出：

我的PHP代码：

  <select name="lstTypex" id="lstTypex" onchange="javascript:showCondition(this.value);showInputType(this.value);">
     In options some values
  </select>
  <span id="condition" style="padding-left:19px;"></span>
  <span id="inputType" style="padding-left:19px;"></span>

我的阿贾克斯代码：

// This function is used to submit for condition fields by ajax
function showCondition(colName) {
if (colName.length == 0) { 
    document.getElementById("condition").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("condition").innerHTML=xmlhttp.responseText;
    }
}
xmlhttp.open("GET","ajax/entity_report.php?colName="+colName+"&doAction=showCondition",true);
xmlhttp.send();
}
// This function is used to submit for condition fields by ajax
function showInputType(colName) {
if (colName.length == 0) { 
    document.getElementById("inputType").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("inputType").innerHTML=xmlhttp.responseText;
    }
}
xmlhttp.open("GET","ajax/entity_report.php?colName="+colName+"&doAction=showInputType",true);
xmlhttp.send();
} 

我的 PHP-Ajax 代码：

// include all required files for this screen
include("../include/common.php");
include(MODEL . "entity_report_class.php");
// create class object for class function access
$objCallUsers = new Entity_Report();
// call required class file functions 
$returnStr = "";
$arrTypex = $objCallUsers->fetch_data_type();
$typex = $arrTypex[$_REQUEST['colName']];
switch($_REQUEST['doAction']) {
case 'showCondition': 
    $arrCondition = array();
    if($typex == 'TB' || $typex == 'TA') {
        $arrCondition = array("Equal to","Not equal to","Starts with","Contains any part of word","Contains full word");
    }
    else if($typex == 'DD' || $typex == 'RD') {
        $arrCondition = array("Equal to","Not equal to");
    }
    $returnStr .= '<select name="lstCondition" id="lstCondition">
    <option>--Please Select--</option>';
    foreach ($arrCondition AS $condition) {
        $returnStr .= '<option>' . $condition . '</option>';
    }
    $returnStr .= '</select>';
break;
case 'showInputType': 
$arrCondition = array();
if($typex == 'TB' || $typex == 'TA') {
     $returnStr .= '<input type="text" name="conditionValue" id="conditionValue" value="" />';
}
else if($typex == 'DD' || $typex == 'RD') {
     $returnStr .= ' <select name="conditionValue" id="conditionValue"></select>';
}
break;
}
print($returnStr);

它根据第二个函数调用为我提供输出。这两个函数都返回一些东西。