loading servlet from jsp and trying to pass multiple parameters
Question
im trying to load a servlet using java script from a jsp. i am also trying to pass two parameter. the page loads but now im printing a sytem out from the servlet it suppose to give me the id and the vehicle vaules but it gives the vehicle felid as null.
ScanServlet doGet was called id = 1 vehicle= [object HTMLParagraphElement]vehicle=null
this is the code
<body onload="notifyOnLoad(<%=request.getParameter("imgid")%>)">
<img id="imgBarcode" src="ImageServlet?imgid=<%=request.getParameter("imgid")%>&vehicle=<%=request.getParameter("vehicle")%>" width=<%=request.getAttribute("Width")%> height=<%=request.getAttribute("Height")%>><br/>
<h4>Barcode Details</h4>
<p>Name :- <%=request.getAttribute("name")%></p>
<p>Type :- <%=request.getAttribute("type")%></p>
<p>Value :- <%=request.getAttribute("value")%></p>
<p id="wtf">type :- <%=request.getParameter("vehicle")%></p>
<script type="text/javascript">
function notifyOnLoad(imgid) {
var xmlhttp;
var vehicle =document.getElementById("wtf");
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) {
window.location = xmlhttp.responseText;
}
}
xmlhttp.open("GET", "ScanServlet?imgid="+imgid+"vehicle="+vehicle, true);
xmlhttp.send();
}
</script
>
</body>
1 answers
solution1
0 ACCPTED 2014-10-30 06:41:23
You cant directly access the request parameters in the javascript in the way you are trying.
<input type='hidden' name='field1' id='imgid' value='<%=request.getParameter("imgid")%>' />
access the variable in the javascript with its id,
<script type="text/javascript">
function notifyOnLoad(imgid,vehicle) {
var xmlhttp;
var imgid=document.getElementById("imgid");
xmlhttp.open("GET", "ScanServlet?imgid="+mgid+"&vehicle="+vehId, true);
xmlhttp.send();
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.