Window Event when "?" added after current URL - javascript

Hashchange is for when
index.php
Changes to, say
index.php#my-hash
i.e.
$(window).bind('hashchange', function() {
// do stuff
});
But is there an event for when there is a ? after the url, i.e.
index.php?id=foo&something_else=bar...
Edit
Okay, it's when I submit a form. I submit the form and then the URL changes to
index.php?id=blah#my-hash
However I tried listening for a) the hashchange and b) the form submit:
$('form').submit(function() {
go_to_signup_form();
});
Neither of which work (I think the page is refreshing?). I can't alter the php too much because it's part of a cms and I don't want to break anything that's happening in say, the controller class so I would rather just try to see when:
index.php
changes to
index.php?id=blah#my-hash
Edit #2
Thanks everyone for the feedback, got it working with:
if (url.indexOf("?") !== -1) {
go_to_signup_form();
}

Nope, that is because the parameters (?foobar) aren't usually used for client-side code. Linking to a new parameter on the same url (index.php -> index.php?foo=bar) makes your browser load a new page, while adding a hash (index.php -> index.php#foo=bar) does not make the browser transmit any data to the server.
The hash section of a url, it's a client-side piece of data. As such, it is useful to have a change event listener for it.
Try these in your console, on a random site that doesn't have a hash in the url yet:
window.location.href += "?test"
and:
window.location.href += "#test"
You will see that the first one will reload the page (Send a new HTTP request), the second one will not appear to do anything.
To prevent a form from submitting:
$('#target').submit(function() {
// Your onclick code here
return false; // Do not submit.
});

The problem with that is that the "hashchange" (technically it means navigation to an anchor) is an entirely client-sided operation. But an URL with arguments (the "?" operator) is fulfilled with a new HTTP request to the server, which results in a new document being sent to the user. That means when a user clicks on a link index.php?id=foo, the page is reloaded.
But you can check the arguments of the URL the page was loaded with by examining the window.location.href string.

Related

Alternate method for dojo.xhrGet() method

I am new to Dojo Framework.I created one button using dojo constructor and dojo.connect onclick event function i written url and load functions.This url navigating servlet and get the response back.
but i don't want response back i want to send request only.
how to do this..anyone help me.
thanks in advance.
are you looking to navigate to another page? if so, you can use window.location.href or other approaches to achieve that. See the foll url for other approaches:
JavaScript: Navigate to a new URL without replacing the current page in the history (not window.location)
if you do not want to navigate but just send some data to the server (and dont care about the response), you can just write an empty function for the callback
var deferred = dojo.xhrGet( {
url : "xxx",
load: function(data) {
//ignore
}
});
});
However, it is recommended to always check the response to ensure there were no errors on the server side.
You could also use dojo.xhrPost to submit your form

How to correctly read Javascript hash in custom affiliate URL?

I'm creating a custom affiliate program. I want my links to be as SEO friendly as possible, so I will use a Javascript hash appended to the URL to send the affiliate id, read the affiliate id, store the click, and then 301 re-direct to the page they were linked too. That way we have no canonical issues whatsoever, and every affiliate link passes link juice!
Now, how would I read the following URL?
www.mydomain.com/seo-friendly-url#ref=john
After getting the hash value for ref and adding the click, how would I then 301 re-direct the user back to
www.mydomain.com/seo-friendly-url
Any help is greatly appreciated!
Fragment identifiers (the part after the #) are not sent to the server, so they cannot be read by anything that could then emit an HTTP response (which you need for a 301 redirect).
The "hash" portion of a URL is not passed to the server, so you will not be able to utilize this data for any server-side redirection or processing directly. However, it is possible to grab the hash on page load and pass it on to the server via AJAX or redirection:
To immediately redirect a user from www.mydomain.com/seo-friendly-url#ref=john to www.mydomain.com/seo-friendly-url/ref/john
if (window.location.hash.match(/#ref=/))
window.location = window.location.href.replace('#ref=', '/ref/')
... but then, why not have just used www.mydomain.com/seo-friendly-url/ref/john to begin with and save the extra leg work? The other route, through AJAX, involves reading the value of the hash after the page has loaded and sending that off to the server to be recorded.
(note: this code uses a generic cross-browser XMLHTTPRequest to send an AJAX GET request. replace with your library's implementation [if you are using a library])
window.onload = function () {
// grab the hash (if any)
var affiliate_id = window.location.hash;
// make sure there is a hash, and that it starts with "#ref="
if (affiliate_id.length > 0 && affiliate_id.match(/#ref=/)) {
// clear the hash (it is not relevant to the user)
window.location.hash = '';
// initialize an XMLRequest, send the data to affiliate.php
var oXMLHttpRequest = new XMLHttpRequest;
oXMLHttpRequest.open("GET", "record_affiliate.php?affiliate="+affiliate_id, true);
oXMLHttpRequest.onreadystatechange = function() {
if (this.readyState == XMLHttpRequest.DONE) {
// do anything else that needs to be done after recording affiliate
}
}
oXMLHttpRequest.send(null);
}
}

AJAX Post Gets Canceled By Redirect

I'm writing a small script to capture link clicks and save the link's URL into a database table in order to track how many times each link on a particular page is clicked. The links are to external sites.
So, I capture the click event in my JavaScript function, use jQuery to post to a PHP page that saves the data in MySQL, and then the JavaScript function redirects the user to the URL of the link they clicked on.
The problem I'm running into is that it seems like the post never completes because the of redirect. I've worked around this by calling the redirect inside the post callback, but that adds a few second delay because it doesn't get called until after the post completes. I'm looking for a way to just post the data and redirect the user immediately, regardless of whether or not the post succeeds or fails.
This is the current code with the workaround. It works fine, but adds the delay:
function trackClicks(event)
{
var clicked = $(this).attr('href');
$.post
(
$('#track-click-post-url').attr('value'),
{
action: 'track_landing_page_clicks',
clicked_url: clicked,
nonce: $('#track-click-nonce').attr('value')
},
function( response )
{
window.location = clicked;
}
);
event.preventDefault();
}
And this is what I'd like to do, but when I try it never completes:
function trackClicks(event)
{
var clicked = $(this).attr('href');
$.post
(
$('#track-click-post-url').attr('value'),
{
action: 'track_landing_page_clicks',
clicked_url: clicked,
nonce: $('#track-click-nonce').attr('value')
}
);
window.location = clicked;
event.preventDefault();
}
jQuery doesn't provide a callback for what you're looking for. Here are the available ready states:
Value State Description
0 UNSENT open()has not been called yet.
1 OPENED send()has not been called yet.
2 HEADERS_RECEIVED send() has been called, and headers and status are available.
3 LOADING Downloading; responseText holds partial data.
4 DONE The operation is complete.
You're looking for readystate 2, as that's the earliest you're aware of the fact that the server received the message.
This should get you off the ground:
var xhr = new XMLHttpRequest();
xhr.open("POST", clicked);
xhr.onreadystatechange = function() {
if (xhr.readyState >= 2) window.location = clicked;
};
xhr.send($('#track-click-post-url').attr('value'));
https://developer.mozilla.org/en/XMLHttpRequest for further reading.
Why do you post using Javascript when you are going to load a page any way?
Just update the db with the link clicked on the new page.
Perhaps using the referrer URL to track on what page the click was.
Or some other solution to get on what page the click was (e.g. url param) or some other way.
When you leave a page, all pending requests are killed, and the new page loads. The 1st way is the correct way. Yes, there will be a delay when a link is clicked, that's because the POST request is running.
You can't run a request in the background of a page, if the user is not on that page.
Maybe you can save the link URL in a cookie, and put it into the DB when the next page loads.

ajax sending request twice

Example URL: http://twitter.realgamingreview.com/index.php
Edit: forgot to mention: use the test sign in: test/test for username/password.
I am attempting to do a simple AJAX request to retrieve some data from a database. The target file, serverTime.php, seems to be working perfectly; it inserts the desired data and returns the desired responseText.
However, the request seems to be firing twice. This is clear when I step through the JavaScript using Firebug. This causes the page to 'reset' (not exactly sure), such that my cursor loses focus from its current textbox, which is a new problem. The URL also says, "localhost/twitter/index.php?message=", even if my message is not actually empty. I want to fix this fairly minor problem before something major comes of it.
The JavaScript is below. ajaxRequest is my XMLHTTPRequest object. Any help is appreciated!
//Create a function that will receive data sent form the server
ajaxRequest.onreadystatechange = function(){
if (ajaxRequest.readyState == 4){
document.getElementById('output').innerHTML = ajaxRequest.responseText;
}
}
// build query string
var message = document.myForm.message.value;
var queryString = "message=" + message;
//send AJAX request
ajaxRequest.open("GET", "serverTime.php" + "?" + queryString, true);
ajaxRequest.send(null);
Thanks,
Paragon
I've seen this many times, and for me it's always been firebug. Try TURNING OFF firebug and submit the request again. Use fiddler or some other means to verify the request only executed once.
When I write AJAX functions in Javascript, I usually keep around a state variable that prevents a new request from being dispatched while one is currently in progress. If you just want to ignore requests that are made before another one finishes, you can do something like this:
Initialize inProgress to false.
Set inProgress to true right before calling ajaxRequest.send(). Do not call ajaxRequest.send() unless inProgress is false.
ajaxRequest.onreadystatechange() sets inProgress to false when the state is 4.
In some cases, however, you'd like to queue the actions. If this is the case, then you can't just ignore the request to ajaxRequest.send() when inProgress is true. Here's what I recommend for these cases:
Initialize ajaxQueue to an empty global array.
Before calling ajaxRequest.send(), push the request onto ajaxQueue.
In ajaxRequest.onreadystatechange() when the state is 4, pop the array to remove the request just services. Then, if ajaxQueue is not empty (array.size > 0), pop again and call send() on the object returned.
My issue was completely unrelated to AJAX. Instead, it was a simple (but obscure) issue where with two textboxes in my form, I was able to hit enter and not have the page reload, but with only one, the page would reload for some reason.
I have since changed my event system such that I am not relying on something so unreliable (now using jQuery to listen for the Enter key being pressed for specific textboxes).
Thanks to those of you who took the time to answer my misinformed question.

How to add parameters to a #Url.Action() call from JavaScript on click

I have a link that when clicked needs to call a controller action with certain data which must be retrieved via JavaScript. The action will be returning a FileStreamResult.
I looked at #Url.Action but I couldn't figure out how (or even if) I could pass value dictionary stuff which had to be retrieved via JS.
So then I went with a $.post from a click handler. The problem I'm having is that I'm not sure what to do in my success: function() to return the file stream result to the user. Or even if I can.
So any help on how you would do something like this would be great..
So then I went with a $.post from a click handler. The problem I'm having is that I'm not sure what to do in my success: function() to return the file stream result to the user. Or even if I can.
Exactly. You can't do much with a received byte in javascritpt: obviously you cannot save it on the client computer nor pass it to some external program on the client. So don't call actions that are supposed to return files using AJAX. For those actions you should use normal links:
#Html.ActionLink("download file", "download", new { id = 123 })
and let the user decide what to do with the file. You could play with the Content-Disposition header and set it to either inline or attachment depending on whether you want the file to be opened with the default associated program inside the browser or prompt the user with a Save File dialog.
UPDATE:
It seems that I have misunderstood the question. If you want to append parameters to an existing link you could subscribe for the click event in javascript and modify the href by appending the necessary parameters to the query string:
$(function() {
$('#mylink').click(function() {
var someValue = 'value of parameter';
$(this).attr('href', this.href + '?paramName=' + encodeURIComponent(someValue));
return true;
});
});
Instead of going with a post, I'd go with associate a JQuery on click handler of the link which would call the controller action. This is assuming that the action method returns a FileStreamResult and sets the correct content type so that the browser interprets the result and renders it accordingly.
With your approach you'd have to interpret in the onSuccessHandler of the post on how to render the generated stream.

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