Michael: AJAX am I-Phone

Beitrag lesen

SELF-Forum

AJAX am I-Phone

Michael
– Informationen zu den Bewertungsregeln

Habe folgenden Java Code:

  
function loadXMLDoc() {  
    // branch for native XMLHttpRequest object  
    if (window.XMLHttpRequest) {  
        req = new XMLHttpRequest();  
        req.onreadystatechange = processReqChange;  
        req.open("GET", "my_data3.xml", true);  
        req.send(null);  
    // branch for IE/Windows ActiveX version  
    } else if (window.ActiveXObject) {  
        req = new ActiveXObject("Microsoft.XMLHTTP");  
        if (req) {  
            req.onreadystatechange = processReqChange;  
            req.open("GET", "my_data3.xml", true);  
            req.send();  
        }  
    }  
}  
  
// handle onreadystatechange event of req object  
function processReqChange() {  
    // only if req shows "loaded"  
    if (req.readyState == 4) {  
        // only if "OK"  
        if (req.status == 200) {  
            createTable();  
         } else {  
            alert("There was a problem retrieving the XML data:n" +  
                req.statusText);  
         }  
    }  
}  
  
function createTable()  
{  
==> Fehlermeldung  
	document.getElementById('Lamp').innerHTML = req.responseXML.getElementsByTagName('Lamp')[0].childNodes[0].nodeValue;  
	document.getElementById('PrName').innerHTML= req.responseXML.getElementsByTagName('Name')[0].childNodes[0].nodeValue;//s.substr(0, 10);  
	document.getElementById('Error').innerHTML=req.responseXML.getElementsByTagName('Error')[0].childNodes[0].nodeValue;  
  
	Projektor = new Image();  
	Input = new Image();  
	Mute = new Image();  
  
	if (req.responseXML.getElementsByTagName('Power')[0].childNodes[0].nodeValue==0)  
	{  
		Projektor.src = "projector_off.PNG";  
	}  
	else  
	{  
		Projektor.src = "projector_on.PNG";  
	}  
	if (req.responseXML.getElementsByTagName('Input')[0].childNodes[0].nodeValue==0)  
	{  
		Input.src = "button_vid.JPG";  
	}  
	else  
	{  
		Input.src = "button_vga.JPG";  
	}  
	if (req.responseXML.getElementsByTagName('Mute')[0].childNodes[0].nodeValue==0)  
	{  
		Mute.src = "button_off.JPG";  
	}  
	else  
	{  
		Mute.src = "button_on.JPG";  
	}  
	if (req.responseXML.getElementsByTagName('Dieb')[0].childNodes[0].nodeValue==0)  
	{  
		document.getElementById("projector1").style.backgroundColor="#FFFFFF";  
	}  
	else if (req.responseXML.getElementsByTagName('Dieb')[0].childNodes[0].nodeValue==1)  
	{  
		document.getElementById("projector1").style.backgroundColor="#FF8000";  
	}  
	else  
	{  
		document.getElementById("projector1").style.backgroundColor="#800000";  
	}  
  
	document.getElementById("prostatus").src=Projektor.src;  
	document.getElementById("inputstatus").src= Input.src;  
	document.getElementById("mutestatus").src= Mute.src;  
        setInterval ("loadXMLDoc()", 200);  
  
}

Und diesen HTML:

  
<body onload="loadXMLDoc();">  
<div style="width: 320px; height: 356px">  
  
<h2><span id="PrName"></span></h2>  
  
<table>  
  <tr>  
    <th style="width:150px" colspan="2">Powerstatus</th>  
  
  </tr>  
  <tr>  
    <td id="projector1" colspan="2">  
	<form action="" method="post">  
		<input type="hidden" name="<?z varname ($output[0]) ?>"  
		<?z if ($output[0] == 0) { ?>value="1"<?z } ?>  
		<?z if ($output[0] != 0) { ?>value="0"<?z } ?>  
		/>  
		<input type="image" SRC="projector_off.PNG" id="prostatus" />  
	</form>	  
    </td>  
  
  </tr>  
  <tr>  
    <th style="width:150px">Picture-Muting</th>  
    <th style="width:150px">Eingangswahl</th>  
  </tr>  
  <tr>  
    <td id="projector2">  
	<form action="" method="post">  
		<input type="hidden" name="<?z varname ($output[2]) ?>"  
		<?z if ($output[2] == 0) { ?>value="1"<?z } ?>  
		<?z if ($output[2] != 0) { ?>value="0"<?z } ?>  
		/>  
		<input type="image" SRC="button_off.JPG" id="mutestatus" width="150"/>  
	</form>  
    </td>  
    <td id="projector3">  
	<form action="" method="post">  
		<input type="hidden" name="<?z varname ($output[1]) ?>"  
		<?z if ($output[1] == 0) { ?>value="1"<?z } ?>  
		<?z if ($output[1] != 0) { ?>value="0"<?z } ?>  
		/>  
		<input type="image" SRC="button_vid.JPG" id="inputstatus" width="150"/>  
	</form>  
    </td>  
  </tr>  
  <tr>  
    <th style="width:150px">Lampenzeit</th>  
    <th style="width:150px">Fehlermeldung</th>  
  </tr>  
  <tr>  
    <td id="projector4"><span id="Lamp"></span><a>h</a></td>  
    <td id="projector5"><span id="Error"></span></td>  
  </tr>  
</table>  
  
</body>  
</div>  
</html>

Folgende Problematik tritt nun auf:

Wenn ich die Seite am IPhone lade bekomme ich einen Fehlermeldung:

TypeError: Result of expression is not an object ==> Fehlermeldung

Wenn ich nun die Taste mit der (id="prostatus") drücke, wird alles korrekt angezeigt, und die Fehlermeldung verschwindet.

Kann mir jemand sagen woran dis liegt?

Danke im voraus

Beitrag melden
–
Informationen zu den Bewertungsregeln