window.location.href using GET when I need POST - javascript

I have the following script, a few lines up from the bottom I have a window.location.href which posts the reults from my form though the address bar. This is very messy and I would like to use POST instead of GET, any ideas anyone ?
<script language="javascript">
function OnChangedUsername()
{
if(document.signup.newuserid.value == "")
{
document.signup.btnCheckAvailability.disabled = true;
}
else
{
document.signup.btnCheckAvailability.disabled = false;
}
}
function createRequestObject() {
var ro;
var browser = navigator.appName;
if(browser == "Microsoft Internet Explorer"){
ro = new ActiveXObject("Microsoft.XMLHTTP");
}else{
ro = new XMLHttpRequest();
}
return ro;
}
var http = createRequestObject();
function sndReq() {
http.open('get', 'password_check.asp?emailaddress=<%Response.Write(emailaddress)%>&check=<%Response.Write(check)%>&password_check='+document.signup.newuserid.value);
http.onreadystatechange = handleResponse;
http.send(null);
}
function handleResponse() {
if(http.readyState == 4){
var response = http.responseText;
var update = new Array();
if(response.indexOf('|' != -1)) {
update = response.split('|');
document.getElementById("username_chk").innerHTML = update[0];
if(document.getElementById("username_chk").innerHTML == "Ok") {
window.location.href='detailsupdate.asp?username=<%Response.Write(sUsername)%>&check=<%Response.Write(check)%>&EmailAddress='+document.signup.EmailAddress.value+'&Address='+document.signup.Address.value+'&Address1='+document.signup.Address1.value+'&Address2='+document.signup.Address2.value+'&City='+document.signup.City.value+'&PostalCode='+document.signup.PostalCode.value+'&Country='+document.signup.Country.value+'&WorkPhone='+document.signup.WorkPhone.value+'&HomePhone='+document.signup.HomePhone.value+'&MobilePhone='+document.signup.MobilePhone.value+'&FaxNumber='+document.signup.FaxNumber.value+'&AlternativePhone='+document.signup.AlternativePhone.value+'&OO='+document.signup.OO.checked+'&Workshop='+document.signup.Workshop.checked+'&Raised='+document.signup.Raised.checked+'&Ground='+document.signup.Ground.checked+'&pd='+document.signup.newuserid.value+'&Tram='+document.signup.Tram.checked;
}
}
}
}
</script>

The only way to make a POST request with the response rendered directly into the browser window is to use a form (which you generate with DOM) and submit it (which you can likewise do through DOM).
The alternative is to use XMLHttpRequest (or some other Ajax technique) and render the response with DOM.

There is no need to pass form data as GET data. You can specify the method as POST.
<form action="script.asp" method="post">
...
<input type="submit" value="submit">
</form>
You also should not be using window.location.href. This is very ugly. When you submit the form (click the submit button) it will POST your form data to script.asp.
Another way to submit your form is to submit it via DOM. document.forms[0].submit();

Related

JSP Chat - How I can parse the value from HTML to JSP page?

I have to make a chat with JSP, AJAX and Java and I have a problem: when I try to use my variable to store value of a input text, this variable is null.
If I add 'action' property to the form, the variable 'textParam' will have the value of the input text, but, if I do that I have to redirect with action to a page and I don't what that.
I need to process something bigger in the JSP page and then to reload in the HTML page (which is a JSP page) (the reload part is not on actual probem).
How I can make to populate 'textParam' with the input text value when I press the button?
PS: I need to make it with pure javascript, not with some libraries :)
The JSP which have to process is:
String textParam = request.getParameter("chatMessage");
System.out.println("textParam = " + textParam);
My form it look like that:
<form id="frmmain" name="frmmain" onsubmit="return blockSubmit();">
<input type="text" id="chatMessage" name="chatMessage" style="width: 447px;" />
<input type="button" name="btn_send_chat" id="btn_send_chat" value="Send" onclick="sendChatText();" />
</form>
The .js file it's this:
var request = getXmlHttpRequestObject();
var response = getXmlHttpRequestObject();
var lastMessage = 0;
var mTimer;
function getXmlHttpRequestObject() {
if (window.XMLHttpRequest) {
return new XMLHttpRequest();
} else if(window.ActiveXObject) {
return new ActiveXObject("Microsoft.XMLHTTP");
}
}
function sendChatText() {
if(document.getElementById('chatMessage').value == '') {
alert("You have not entered a message");
return;
}
if (request.readyState == 4 || request.readyState == 0) {
request.open("POST", 'getChat2.jsp?chat=1&last=' + lastMessage, true);
request.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
request.onreadystatechange = handleSendChat;
var param = 'message=' + document.getElementById('chatMessage').value;
param += '&chat=1';
request.send(param);
document.getElementById('chatMessage').value = '';
}
}
function handleSendChat() {
clearInterval(mTimer);
getChatText();
}
function blockSubmit() {
sendChatText();
return false;
}
The problem is here:
String textParam = request.getParameter("chatMessage");
I was trying to get 'chatMessage' parameter, which it was only the name of the input. The solve is to get 'message' param which it was defined and requested in js:
String textParam = request.getParameter("message");

Access XMLHttpRequest data in CakePhp controller

I have this piece of code:
var form = document.querySelector('form');
var request = new XMLHttpRequest();
var formData = new FormData(form);
request.open('POST','/leandwell/processData', true);
request.send(formData);
request.onreadystatechange = function() {
if (request.readyState === 4) {
if (request.status === 200) {
// OK
alert(request.responseText);
} else {
// not OK
alert('failure!');
}
}
};
With this function in my controller:
public function processData(){
$this->autoRender = false;
$data = $this->request->data;
return json_encode($data['address']);
}
But it's just alerting Undefined index address meanwhile I have <input type="text" name="address"> inside my form. Is their another way I can access this data correctly in my controller method.
I am actually using XMLHttpRequest because the form has input type file, because I need to upload a file along with it.
Any suggestion will be appreciated.
Thanks.
I'm pretty sure your formData doesn't match what Cake expects. Make sure the form data you send equals that HTML attribute name="data[address]" instead of name="address".
Also instead of doing return json_encode($data['address']); read XML and Json Views in CakePHP.

Javascript - Posting a form with AJAX and getting return values

I have now got everything to post correctly but this script keeps loading it into a new page. Is it something to do with the way my php file returns it? "echo(json_encode($return_receipt));"
<script>
// Get XML HTTP Type
function get_XmlHttp() {
var xmlHttp = null;
if(window.XMLHttpRequest) {
xmlHttp = new XMLHttpRequest();
}else if(window.ActiveXObject) {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
return xmlHttp;
}
function ajaxSuccess () {
alert(this.responseText);
}
function ajaxrequest(oFormElement,tagID) {
//Get The Correct XMLHTTP Object
var request = new XMLHttpRequest();
request.onload = ajaxSuccess;
request.open(oFormElement.method, oFormElement.action, true);
//request.setRequestHeader("Content-type","application/x-www-form-urlencoded");
request.send(new FormData(oFormElement));
}
</script>
you have two easy options..
1.you can use jquery ajax method... or
2. javascript form submission without loading the page by targetting the form to the hidden inline frame
here i'm using it for image upload image name without hitting submit button and save the data to the database table without reloading the page.. edit it according to your convenience.
function upload(img)//Javascript function
{
var types = /\.jpg|\.gif|\.jpeg/i;
var filename = img.value;
if (filename.search(types) == -1) {
alert("Select only images ( jpg or gif or jpeg format)");
img.form.reset();
return false;
}
img.form.action = 'upload-picture.php';
img.form.target = 'iframe';
img.form.submit();
return true;
}
// here is iframe on the same page
<iframe name="iframe" id="u_iframe" style="display:none;"></iframe>
<input type="file" name="picture" id="picture" onchange="return upload(this);" />

Popup preview of a textarea using a PHP function

I'd like to make a popup preview of a textarea, using a PHP function inside the popup.
Let's say you type "Hello world" in the textarea, then you click "preview" and you get your text converted to "Hey you" by a PHP function in a popup (of course the function is not that simple, that's the reason why I can't adapt this in pure javascript).
Is it possible to do so ?
I know it could easily send the form to an intermediate page, but I must keep the form in background... that's why I need a quick preview on fly.
I did the following:
function PreviewMe() {
var newWin = window.open("", "_blank");
newWin.document.write("<html><body>"+document.getElementById('myText').value+"</body></html>");
newWin.document.close();
}
and
<textarea id="myText" ... />
<input type="submit" ... onclick="PreviewMe();">
Obviously it works without reformatting anything, so how to reformat this result in the popup please ?
Would it be possible (and mayber a better option) to use XMLHttpRequest ?
Thx !
Yes , you should use an XHR request to send data to a script which will return you data to be manipulated on the client side.
Thanks, it was by far easier in the end.
In case it might help others, here is what I've done.
Js function became :
function PreviewMe() {
var xhr = null;
if (window.XMLHttpRequest || window.ActiveXObject) {
if (window.ActiveXObject) {
try {
xhr = new ActiveXObject("Msxml2.XMLHTTP");
} catch(e) {
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}
} else {
xhr = new XMLHttpRequest();
}
} else {
alert("XMLHTTPRequest not supported...");
return;
}
xhr.open("POST", "page.php", true);
xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xhr.onreadystatechange = function() {
if (xhr.readyState == 4 && (xhr.status == 200 || xhr.status == 0)) {
document.getElementById('show').innerHTML = xhr.responseText;
}
};
xhr.send("var="+document.getElementById('myText').value+"");
return;
}
Of course page.php includes my PHP function, show is the id of the div where the result is printed.

xmlhttprequest: "password" from txt-file

I'm new to javascript/ajax and a bit stuck right now.
The assignment is to use only javascript/ajax.
I'm supposed to make a login-form, and when typing in the right password it will display a "secret message". Currently this message is an alert-box.
This is in the script for validating the form input:
var riktigPassord = 'password';
var passord = window.document.passordSkjema.passord.value;
if (passord == riktigPassord ) {
alert("Dette er en hemmelig beskjed");
window.document.passordSkjema.passord.focus();
return true;
}
else {
alert("Innlogging mislyktes. Passord er feil!");
window.document.passordSkjema.passord.focus();
return false;
}
}//slutt på funksjonen her
And this is the code for the form:
<form name="passordSkjema" action="#" method="post"
onSubmit="return validerPassord();">
Passord: <input type="text" name="passord"><br>
<input type="submit" name="knapp">
</form>
I'm supposed to get the password from a txt-file. (still using only javascript)
and in my case, the txt-filename is "password.txt".
I've never done this before, but I think I know how to make a XHR-object... xD
// New XMLHttpRequest-object
function newXHRobjekt() {
try {
XHRobjekt = new XMLHttpRequest(); // Firefox, Opera, ...
} catch(err1) {
try {
XHRobjekt = new ActiveXObject("Microsoft.XMLHTTP"); // Noen IE
} catch(err2) {
try {
XHRobjekt = new ActiveXObject("Msxml2.XMLHTTP"); // Noen IE
} catch(err3) {
XHRobjekt = false;
}
}
}
return XHRobjekt;
}
So.. My question is. How do I use a XHR-object to get use the functions above to check the password-input against password.txt. the file only contains the password (for instance only "12345"). and also I would like to know how to get the "secret message" from another txt-file.
I'm aware that this isn't secure at all, but it's a part of understanding javascript/Ajax, in my classes.
Thanks!
add the following code to the onload event of the body.
var passwordLoaded = false;
var password = "";
var secretMessageLoaded = false;
var secretMessage = "";
var xhr = newXHRobjekt();
xhr.open("GET", "password.txt");
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
password = xhr.responseText;
passwordLoaded = true;
}
}
xhr.send(null);
xhr = newXHRobjekt();
xhr.open("GET", "secret_message.txt");
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
secretMessage = xhr.responseText;
secretMessageLoaded = true;
}
}
xhr.send(null);
If both passwordLoaded and secretMessageLoaded are set to true you can use the variables password and secretMessage.
Like many of the Javascript APIs XHR object too have an async interface. So you will need to define callback functions to handle the responses:
xmlhttp.open("POST", "http://example.com",true);
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4) {
alert(xmlhttp.responseText)
}
}
xmlhttp.send('my request data');
Search for example on the net. I found a post, a bit old but seem to have good examples.

Categories