Php ajax不在DOM中加载内容

加载print.php以显示内容，而不是在html中填充“tempDiv”。同样的代码也适用于其他文件和javascript函数：/

HTML:

调用printDiv（）函数以打印所选列：

function printDiv()
{

var xmlhttp;

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("searchresults").innerHTML=xmlhttp.responseText;
    }
  }*/



  xmlhttp.open("POST", "print.php", true);          // set the request
  xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");            // adds  a header to tell the PHP script to recognize the data as is sent via POST
  xmlhttp.send();       // calls the send() method with datas as parameter

  // Check request status
 // If the response is received completely, will be transferred to the HTML tag with tagID
  xmlhttp.onreadystatechange = function() {
    if (xmlhttp.readyState == 4) {
      document.getElementById("tempDiv").innerHTML = xmlhttp.responseText;
    }
  }



}

PHP:

---

发送请求之前是否应该定义readystate函数

第二部分。看起来printdiv函数提交了一个表单。如果您使用的是严格的AJAX过程，那么应该能够删除表单标记。您还需要调整其他一些事情来实现这一点。
您的意思是将PHP代码加载到DOM中？>通常ajax使用innerHTML等加载DOM中选定元素中的内容。但是，在我的例子中，Prim.PHP被加载到DOM中，ECHO语句简单地将数据放在空白页上，而不是将其加载到TunDeVik中。html@AkashGupta虽然在你发送的截图中，表格似乎在回响。我丢失标签了吗？我在你的php或js中没有看到它们。虽然一个好的做法是，只要他正在寻找的状态是4，顺序并不重要..这没有什么区别兄弟..：/我的答案的哪一部分？readystate部分..我同意第2部分，但是我需要将所选字段传递到PHP文件，这就是为什么我使用表单和ajax。是否有其他方法通过ajax将所选字段传递给PHP文件

要访问选中的复选框，是否有其他方法可以通过AJAX访问这些选中的复选框，以便删除表单标记？

function viewall(){

var xmlhttp;

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("searchresults").innerHTML=xmlhttp.responseText;
    }
  }*/



  xmlhttp.open("POST", "viewall.php", true);            // set the request
  xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");            // adds  a header to tell the PHP script to recognize the data as is sent via POST
  xmlhttp.send();       // calls the send() method with datas as parameter

  // Check request status
 // If the response is received completely, will be transferred to the HTML tag with tagID
  xmlhttp.onreadystatechange = function() {
    if (xmlhttp.readyState == 4) {
      document.getElementById("searchresults").innerHTML = xmlhttp.responseText;
    }
  }

}

function printDiv()
{

var xmlhttp;

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("searchresults").innerHTML=xmlhttp.responseText;
    }
  }*/



  xmlhttp.open("POST", "print.php", true);          // set the request
  xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");            // adds  a header to tell the PHP script to recognize the data as is sent via POST
  xmlhttp.send();       // calls the send() method with datas as parameter

  // Check request status
 // If the response is received completely, will be transferred to the HTML tag with tagID
  xmlhttp.onreadystatechange = function() {
    if (xmlhttp.readyState == 4) {
      document.getElementById("tempDiv").innerHTML = xmlhttp.responseText;
    }
  }



}

<?php

$col = $_POST['print'];

$flds = "";
foreach($col as $value){

if(isset($col)){
if($flds !="") 
$flds .= ",";
$flds .= $value;
}

}

$sql = "SELECT ". $flds." from student";



$con = mysqli_connect("localhost", "root", "","university") or die("could not connect". mysqli_error($con));
$rs = mysqli_query($con, $sql);


echo "<table border='1'";

while($r = mysql_fetch_array($rs)){

                            echo "<tr>";
                            echo "<td class='searchtabledata'>".$r[0]."</td>";
                            echo "<td class='searchtabledata'>".$r[1]."</td>";
                            echo "</tr>";

                }                           



?>