Question

我对Ajax很新鲜并做了一些他们工作的例子，但后来他们停了下来，我相信某处涉及错误。

mainfile

<button class='chbt' title='Test' value=" . $i . " onclick='changer($(this).val())'></button>

转换器功能

function changer(val)
{
    if (val == null)
    {
        document.getElementById("dataedit").innerHTML = "";
        return;
    } 
    else
    {
    if (window.XMLHttpRequest)
    {
        xmlhttp = new XMLHttpRequest();
    } 
    else
    {
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    xmlhttp.onreadystatechange = function()
    {
        if (this.readyState == 4 && this.status == 200) 
        {
            document.getElementById("dataedit").innerHTML = this.responseText;
        }
    };
    xmlhttp.open("GET","testing.php?id="+val,true);
    xmlhttp.send();
}

testing.php文件

<?php
include_once 'dbconnect.php';
$ged = $_GET['id'];
$query = $DBcon->query("SELECT * FROM review WHERE RID=".$ged);
$RRow=$query->fetch_array();
?>
<html>
    <head>
        <script src="scripts/jscript.js"></script>
    </head>
    <body>
    <script>
        alert("working123!!!");
        $('#dataformas').hide();
        $('#dataedit').show();
    </script>
        <form method='post' action='updatereview.php' id='updata' name='updata'>
        Vn<input name='rating' id='rating' type='range'  min='1' max='5' maxlength='500' value='<?php echo $RRow[4]; ?>' step='1' required />Pt<br><br>
        <textarea name='edittext' id='edittext' rows='5' cols='30'><?php echo $RRow[2]; ?></textarea>
        <span id='count2'></span>
        <script>
            //location.hash = ".updata";
            var el_t = document.getElementById('edittext');
            var length = el_t.getAttribute('maxlength');
            var el_c = document.getElementById('count2');
            el_c.innerHTML = length;
            el_t.onkeyup = function () 
            {
                document.getElementById('count2').innerHTML = (length - this.value.length)+' left';
            };
            </script><br>
                <input type='hidden' name='idas' id='idas' value="<?php echo $ged; ?>">
                <input type='hidden' name='cidas' id='cidas' value="<?php echo $RRow[3]; ?>">
                <button type='submit' form='updata' id='send_button' value='Submit'>Update</button>
        </form>
    </body>
</html>

我可以看到我需要传递一个由循环生成的整数的参数，所以我的变换器函数不起作用并抛出

未捕获的TypeError：无法设置null的属性“innerHTML” 在XMLHttpRequest.xmlhttp.onreadystatechange

更换器功能不起作用或涉及错误

0 个答案: