i want to capture finger print using morpho device. i am able to do that but the thing is, i am getting error because the service i am using is http and my website is https. so i have to allow every time my website to read http url.
what actually they are doing is, they are giving a service which allow me to access http://localhost:8080/CallMorphoAPI. but this is for http not https. i installed morpho driver which started this service. so what i want to know if there any way so i can modify this service. I want Finger print scan using morpho 1300 e2 using java api.
function CallFingerAPI()
{
var url = "http://localhost:8080/CallMorphoAPI";
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)
{
fpobject = JSON.parse(xmlhttp.responseText);
console.log(fpobject.Base64BMPIMage);
// Call Servlet
function uploadThumb(image){
var formdata = image;
var fr = new FormData();
fr.append("data", formdata);
var id = "<%=patientId%>";
var url = "ThumbUpload?patientId="+id;
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function(){
if(xmlhttp.readyState === 4 && xmlhttp.status === 200){
var response = xmlhttp.responseText;
response = response.replace(/\r?\n|\r/g, "");
response = response.trim();
if(response === "Uploaded"){
alert("Uploaded");
}
else{
alert("Error");
}
}
};
try{
xmlhttp.open("POST",url,true);
xmlhttp.send(fr);
}catch(e){alert("unable to connect to server");
}
}
uploadThumb(fpobject.Base64BMPIMage);
template = fpobject.Base64ISOTemplate;
}
}
var timeout = 5;
xmlhttp.open("POST",url+"?"+timeout,true);
xmlhttp.send();
}
Related
I have the following code :
<head>
<script>
function startChanging() {
var elems = document.getElementsByTagName("img");
for(var i=0; i < elems.length; i++)
{
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["elem"] = elems[i];
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
this["elem"].src = xmlhttp.responseText;
}
}
xmlhttp.open("GET", "http://myurl.com/somescript.php", true);
xmlhttp.send();
}
};
</script>
</head>
<body onload="startChanging()">
<img src="https://www.google.com/images/srpr/logo11w.png">
<br/>
<img src="https://www.google.com/images/srpr/logo11w.png">
<br/>
<img src="https://www.google.com/images/srpr/logo11w.png">
</body>
Even though I create a new instance of XMLHttpRequest for each iteration and add the current element to an attribute, when the request returns a response only the last img element is changed.
I am looking for a simple solution to change the src of the img element without iterating through all the elements again when the response comes. I would like a pure Javascript solution (read: no JQuery).
I am certainly doing something wrong here I just don't understand what. Any help would be appreciated.
In your for loop, you are overwriting the xmlhttp variable so when you get into the onreadystatechage function and you check the value of xmlhttp.readyState, it will not be checking the right object.
I'd suggest this fix which changes two things:
It puts each ajax call into it's own IIFE which keeps the xmlhttp variable separate for each ajax call.
It passes elems[i] into the closure so you don't have to do the property saving hack.
Code:
function startChanging() {
var elems = document.getElementsByTagName("img");
for(var i=0; i < elems.length; i++)
{
(function(obj) {
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)
{
obj.src = xmlhttp.responseText;
}
}
xmlhttp.open("GET", "http://myurl.com/somescript.php", true);
xmlhttp.send();
})(elems[i]);
}
};
One possible approach:
xmlhttp.onreadystatechange = function() {
if (this.readyState === 4 && this.status === 200) {
this.elem.src = this.responseText;
}
}
As you see, I've replaced all the references to xmlhttp within that handler function to this.
The problem is even though you've created a new AJAX-serving object at each step of the loop, each newly-created 'readystatechange' handler function referred to the same object known under xmlhttp variable.
In general, this is quite a common problem when someone works with a variable declared within a loop yet referred by functions created in the same loop. Stumble upon this once or twice, and you'll begin to see the pattern. )
xmlhttp.send();
Put data into the send method:
xmlhttp.send(data);
Source: https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest
void send();
void send(ArrayBuffer data);
void send(ArrayBufferView data);
void send(Blob data);
void send(Document data);
void send(DOMString? data);
void send(FormData data);
Where data is a JavaScript variable, you can put anything into. If you want multipart message, you'd use var data = new FormData(); and put data into it using data.append('image', file); for file upload via ajax for example.
If no multipart, simply put anything in like:
data = { images: document.getElementsByTagName("img") }
Trying to load contents from postcode.php file into a #postcodeList div, but it is not working (nothing happens). I checked postcode.php file it echoes al correct information.
var loadicecream = document.getElementById("iceCreams");
loadicecream.addEventListener("click", iceAjax, false);
function iceAjax() {
var xmlhttp;
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
}
else {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.open("POST","ice-cream-list.php",true);
xmlhttp.send();
document.getElementById("ice-cream-list").innerHTML = xmlhttp.responseText;
}
You want the query to execute asynchronously (the third parameter to open function) and then you synchronously try to read the value. This happens before the query has been sent, so it will always be empty.
Either run the load synchronously, or set the xmlhttp.onreadystatechange to point into a function where you handle the loaded state. The best way is to do it asynchronously since you don't want to block the user from using the page while loading data.
Quick example, only handles the success case:
var xmlhttp;
if (window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
}
else {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function()
{
if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
{
document.getElementById("postcodeList").innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("POST","postcode.php",true);
xmlhttp.send();
Read up on the documentation for the onreadystatechange, at least you want to handle the case where there is a timeout or some error, otherwise the user won't know something went wrong.
I am getting json response from ajax request
I want to return json result to getTwitterVal() function call in var obj. And then getting name and id in $('#loginTwitter').click(function data() {}. How to this this?
Following code returns alert 'undefined'
function getTwitterVal()
{
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)
{
var result = xmlhttp.responseText;
//result looks like this : {"name": jack,"id":1}
//obj = JSON.parse(result);
return result;
}
}
xmlhttp.open("POST","redirect.php",true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xmlhttp.send();
// api_call();
}
$('#loginTwitter').click(function data() {
var obj = getTwitterVal();
alert(obj.name); // I want retrieve name and id both value here
}
UPDATED code
function getTwitterVal(clb)
{
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()
{
var result = xmlhttp.responseText;
var obj = JSON.parse(result);
clb(obj);
}
xmlhttp.open("POST","redirect.php",true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xmlhttp.send();
// api_call();
}
$('#loginTwitter').click(function data() {
getTwitterVal(function(obj) {
alert(obj.name);
});
});
Gives error
SyntaxError: JSON.parse: unexpected character var obj = JSON.parse(result);
It doesn't work like that. AJAX call is asynchronous. Although it is possible to make it synchronous you should never do it (since it will block all other scripts on the page). Instead pass a callback to getTwitterVal:
function getTwitterVal(clb) {
// some code
if (xmlhttp.readyState == 4 && xmlhttp.status==200)
{
var result = xmlhttp.responseText;
var obj = JSON.parse(result);
clb(obj);
}
// other code
}
and then
$('#loginTwitter').click(function data() {
getTwitterVal(function(obj) {
alert(obj.name);
});
}
Use asynchronous ajax, as mentioned by #freakish. Also, if you already use jquery, then let it makes its ajax work also. Something like that:
$('#loginTwitter').click(function() {
$.post(
'redirect.php',
function(data) {
var obj = JSON.parse(data);
alert(obj.name);
});
});
I have an application that has a long time processing in code behind.
I was thinking on starting the long time processing by calling from javascript a page,
function OnCopy(type){
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){
//window.clearInterval(interval_handler);
alert('done');
}
}
xmlhttp.open("GET", "<%=Request.Path %>?copy=" + type, true);
xmlhttp.send();
interval_handler = window.setInterval(OnCheckStatus, 1000);
}
The last line of this function will start a timer, to check every second the status:
function OnCheckStatus(){
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){
//window.clearInterval(interval_handler);
//var result = eval(xmlhttp.responseText);
//var pb = document.getElementById('progressbar_' + result[0]);
//if(pb != null)
// pb.innerHTML = result[1] + ' % - ' + result[2];
debug++;
var pb = document.getElementById('progressbar_test');
pb.innerHTML = debug;
}
}
xmlhttp.open("GET", "<%=Request.Path %>?checkstatus=1", true);
xmlhttp.send();
}
On code behind I have this long time processing function and check status function:
private void Copy(string type)
{
Application["ProgressBar.Type"] = type;
for (int i = 0; i < 100; i++)
{
System.Threading.Thread.Sleep(100);
Application["ProgressBar.Value"] = i.ToString();
}
Application["ProgressBar.Type"] = null;
Application["ProgressBar.Value"] = null;
}
private void CheckStatus()
{
Response.Clear();
string type = (string)Application["ProgressBar.Type"];
string value = (string)Application["ProgressBar.Value"];
if (type == null) type = "";
if (value == null) value = "";
string response = "['" + type + "','" + value + "','" + DateTime.Now.ToString("HH:mm:ss") + "']";
Response.Write(response);
Response.End();
}
Now, the problem is that until the Copy function is not finished, there is no answer on the CheckStatus function from code behind (I think all calls are queued), but, when is finished, the displayed debug value is starting from 10, directly, like all the answers for these 10 calls are coming at the same time.
Is like ASP.NET is only responding to one call only at a time, from the browser. I was having the impression that the server will process at least 2 calls at the same time from the same browser.
Can you help me with this, please?
Please check this article. I think that it will help you with your issue.
But also there is an integrated solution in asp.net webforms named as UpdateProgress msdn link with example
I have a proxy script that outputs json data via php, and I want to be able to manipulate this data using javascript. I have the following code, but it only gets the entire json string outputted by the php script. How do I take the data and be able to access the individual objects with in this json data?
var xmlhttp;
function loadXMLDoc(url, cfunc) {
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 = cfunc;
xmlhttp.open("GET", url, true);
xmlhttp.send();
}
loadXMLDoc("http://xxxxx.appspot.com/userbase_us.php?callback=userdata", function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
var json = xmlhttp.responseText;
alert(json);
}
});
You can use the native JSON.parse method:
var json = JSON.parse(xmlhttp.responseText);
Note that since this is not supported by older browsers, you will most likely want to polyfill it.