I am doing ajax call from a jsp page that will go to the servlet. The servlet is returing one String array. That I want to use in ajax response data but each time I am getting true not the string array. How can I get string array in response text.
if(window.XMLHttpRequest){
xmlDoc = new XMLHttpRequest();
}
else if(window.ActiveXObject){
xmlDoc = new ActiveXObject("Microsoft.XMLHTTP");
}
url="./MacroOperations?copyRoleId="+copyRoleId;
xmlDoc.open("POST",url, false);
xmlDoc.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xmlDoc.send(null);
var status=0;
if(xmlDoc.readyState == 4){
if (xmlDoc.status == 200) {
status=xmlDoc.responseText;
alert(status);
}
}
I think you can just return the String value in your servlet.
Related
i have a javascript array with values like "correct", "wrong".
I want to send this array to my php file using ajax. But im not familiar with how.
This is what i have tried so far..and i would like to do this without jquery.
var hold=[];
for(t = 0;t <= 10; t++){
answers_Arr = document.getElementsByName("question"+t);
for (k = 0; k < answers_Arr.length; k++){
if(answers_Arr[k].checked){
hold[t] = answers_Arr[k].value;
//document.getElementById("test"+t).innerHTML = "Value: "+ hold[t];
break;
}else{
hold[t] = "no";
continue;
}
}
}
var jsonString = JSON.stringify(hold);
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("test1").innerHTML= xmlhttp.responseText;
}
}
xmlhttp.open("GET","result.php?res="+hold[],true);
xmlhttp.send();
}
Here is an example of sending the json string with POST through AJAX:
var jsonString = JSON.stringify(hold);
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
//
}
xmlhttp.open("POST","result.php",true);
xmlhttp.setRequestHeader("Content-type", "application/json");
xmlhttp.send(jsonString);
Avoid sending json strings with GET method because if the request string gets too long, the browser will throw you an error.
Now in your php script you will have all the data in $_POST
Edit: Looks like on some versions of php, the requests that have other Content-type, like application/json, the $_POST has an empty value. To fix this you can do:
$_POST = json_decode(file_get_contents('php://input'));
replace this line
xmlhttp.open("GET","result.php?res="+hold[],true);
with
xmlhttp.open("GET","result.php?res="+jsonString,true);
I have the below js code:
xmlhttp = GetXmlHttpObject();
if (xmlhttp != null) {
var url = "/support/residential/outage/serviceOutage?cbrnum=" + cbrnum + "&btn=" + btn + "&outagetkt=" + outagetkt;
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById("thankyoucontent").innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("POST", url, true);
xmlhttp.send(null);
}
This calls a servlet by passing certain params in query string. Now my question is , can we bind all the params into a single object , send that object alone in query string and use the object in the servlet to retrieve the param values? Is it possible?
Yes, you can send the data as JSON to the server:
var data = {cbrnum: cbrnum, btn: btn};
var url = "...?data=" + encodeURIComponent(JSON.stringify(data));
Then on the server side, retrieve the value of data and parse the JSON into native data types (Converting JSON to Java).
Note though that browsers often impose a length limit on the URL. If you have a lot of data, do a POST request instead.
I am trying to POST a JSON object to a servlet via AJAX. However, the object is null in the servlet. I am unable to figure out what's wrong with this code.
JAVASCRIPT
function submitValues(event, val1, val2)
{
var xmlHttpObj = new XMLHttpRequest();
if(window.XMLHttpRequest)
{
xmlHttpObj = new XMLHttpRequest();
}
else if(window.ActiveXObject)
{
xmlHttpObj = new ActiveXObject("Microsoft.XMLHttp");
}
var jsonObject = submitTheValues(event, val1, val2);
alert("json is:" +jsonObject);
var json = JSON.stringify(jsonObject);
alert("json after stringify:" +json);
xmlHttpObj.open("POST", "../myapp/myservlet", true);
xmlHttpObj.setRequestHeader("Content-type", "application/json");
xmlHttpObj.send(json);
}
SERVLET
String jsonObj = request.getParameter("json");
If you want to receive the data as a parameter you'll have to send it as application/x-www-form-urlencode.
xmlHttpObj.open("POST", "../myapp/myservlet", true);
xmlHttpObj.setRequestHeader("Content-type", "application/x-www-form-urlencode");
xmlHttpObj.send('json='+encodeURIComponent(json));
I have a rest webservice which can accept a string. I want to pass a json object as a string to this service. I have to use a HTML page with some textfields and has to pass the form data to the service. can any one help??
Thankyou
you can try this
function callWebService{
var field= document.getElementById('field').value;
//use jquery to convert to json object
//see comment for more info on this
var ws = 'http://localhost:8080/WebServicePath/';
var url = ws + field;
var xmlhttp = null;
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
}
else if (window.ActiveXObject) {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
alert("Success");
}
else {
alert("Failure");
}
};
xmlhttp.open('GET', url, true);
xmlhttp.send(null);
}
I just wrote a basic user-login system where the html page uses javascript to send the ajax request to a servlet which accesses through database.
Here's the js code
var res;
function getXMLObject()
{
var xmlHttp = false;
try {
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP") // For Old Microsoft Browsers
}
catch (e) {
try {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP") // For Microsoft IE 6.0+
}
catch (e2) {
xmlHttp = false // No Browser accepts the XMLHTTP Object then false
}
}
if (!xmlHttp && typeof XMLHttpRequest != 'undefined') {
xmlHttp = new XMLHttpRequest(); //For Mozilla, Opera Browsers
}
return xmlHttp; // Mandatory Statement returning the ajax object created
}
var xmlhttp = new getXMLObject(); //xmlhttp holds the ajax object
function handleServerResponse() {
if (xmlhttp.readyState == 4) {
res=xmlhttp.responseText;
}
else {
return false;
alert("Error during AJAX call. Please try again");
}
}
function ajaxFunction() {
var veid=document.getElementById("eid").value;
var vpwd=document.getElementById("pwd").value;
//window.alert('here inside ajaxFunction'+vconf+' '+vseid);
if(xmlhttp) {
xmlhttp.open("GET","check_login?eid="+ veid +"&pwd="+ vpwd,true); //this is the servlet name
xmlhttp.onreadystatechange = handleServerResponse;
xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
xmlhttp.send(null);
}
}
function def()
{
//window.alert('hi');
ajaxFunction();
//alert('res:'+res);
if(res=='y')
{
return true;
}
else
{
document.getElementById("uhidden").style.color="#CC0000";
document.getElementById("uhidden").innerHTML="Invalid E-Mail ID or Password"
return false;
}
}
But the code works only after two clicks :(
Any help guys?
Your def function calls ajaxFunction and then straight away checks the res variable. However ajaxFunction just sends the AJAX request; it does not wait for the AJAX response to arrive. Your code is checking the res variable before it is being set from the AJAX response.
This is why it works on the second click - not because the res variable is being set by the second click's AJAX response, but because it is still set from the first click's AJAX response.
The solution is to re-arrange your code a bit. Move the code to display the invalid login message to where the AJAX response is received. In other words, replace the res=xmlhttp.responseText; line with some code to check if xmlhttp.responseText is not y and display the invalid login message.
I guess you call def()
Your Request ist asynchron(because you set the 3rd argument of open() to true ), but in def() you immediately after sending the request work with the the result:
ajaxFunction();
//alert('res:'+res);
if(res=='y')
At this time the request usually is not finished, the result not available yet
Put all code that has to work with the server-response into handleServerResponse()