The five-parameter version of the `XMLHttpRequest.open` method allows you to specify the username and password. ([WHATWG spec][1])

    xhr.open(method, url, async, username, password)

  [1]: https://xhr.spec.whatwg.org/#the-open()-method

There is a good article/tutorial written by [Paul James][1]. I used it some time ago and it worked for me.

[HTTP Authentication with HTML Forms][2]

&gt; [...] XMLHTTPRequest, it can submit the
&gt; correct HTTP auth headers for us.
&gt; Rather than adjusting the URL the form
&gt; submits to, we can use XMLHTTPRequest
&gt; to do a request before the form
&gt; submits supplying the entered username
&gt; and password.
&gt;
&gt; This will set up the
&gt; browser with the HTTP auth credentials
&gt; so it&#39;ll also send them with our
&gt; actual form submission login request.


  [1]: http://www.peej.co.uk/
  [2]: http://www.peej.co.uk/articles/http-auth-with-html-forms.html

**Why the following example prints &quot;0&quot; and what must change for it to print &quot;1&quot; as I expected ?**

    #include &lt;iostream&gt;
    struct base {
       virtual const int value() const {
          return 0;
       }
       base() {
          std::cout &lt;&lt; value() &lt;&lt; std::endl;
       }
       virtual ~base() {}
    };
    
    struct derived : public base {
       virtual const int value() const {
          return 1;
       }
    };
    
    int main(void) {
       derived example;
    }


C++ virtual function from constructor

I&#39;m pretty accustomed to clearing my floats by using `&lt;br style=&quot;clear:both&quot;/&gt;` but stuff keeps on changing and I am not sure if this is the best practice. 

There is a [CSS hack][1] (from positioneverything) available that lets you achieve the same result without the clearing div. But... they claim the hack is a little out of date and instead you perhaps should look at [this hack][2]. But.. after reading through 700 pages of comments :) it seems there may be some places the latter hack does not work. 

I would like to avoid any javascript hacks cause I would like my clearing to work regardless of javascript being enabled. 

What is the current best practice for clearing divs in a browser independent way?


  [1]: http://www.positioniseverything.net/easyclearing.html
  [2]: http://www.sitepoint.com/blogs/2005/02/26/simple-clearing-of-floats/

What is the best way to clear the CSS style &quot;float&quot;?

Where can I find reference code that implements a HTTP Basic Authentication client in pure JavaScript, suitable for AJAX?

Extra points for code, or pointers to code, that can be used independent of JS toolkits like YUI. No points for Java, Flash/Flex, PHP frameworks, etc.

Pure JavaScript code for HTTP Basic Authentication?

<p>Where can I find reference code that implements a HTTP Basic Authentication client in pure JavaScript, suitable for AJAX?</p>
<p>Extra points for code, or pointers to code, that can be used independent of JS toolkits like YUI. No points for Java, Flash/Flex, PHP frameworks, etc.</p>


Can someone suggest a way to compare the values of **two dates** greater than, less than, and not in the past using JavaScript? The values will be coming from text boxes.

Compare two dates with JavaScript

I&#39;m working on some JQuery to hide/show some content when I click a link. I can create something like:

    &lt;a href=&quot;#&quot; onclick=&quot;jquery_stuff&quot; /&gt;

But if I click that link while I&#39;m scrolled down on a page, it will jump back up to the top of the page.

If I do something like:

    &lt;a href=&quot;&quot; onclick=&quot;jquery_stuff&quot; /&gt;

The page will reload, which rids the page of all the changes that javascript has made.

Something like this:

    &lt;a onclick=&quot;jquery_stuff&quot; /&gt;

Will give me the desired effect, but it no longer shows up as a link. Is there some way to specify an empty anchor so I can assign a javascript handler to the `onclick` event, without changing anything on the page or moving the scrollbar?




How can I create an empty HTML anchor so the page doesn&#39;t &quot;jump up&quot; when I click it?

I would like to create a `String.replaceAll()` method in JavaScript and I&#39;m thinking that using a regex would be most terse way to do it.  However, I can&#39;t figure out how to pass a variable in to a regex.  I can do this already which will replace all the instances of `&quot;B&quot;` with `&quot;A&quot;`.

    &quot;ABABAB&quot;.replace(/B/g, &quot;A&quot;);


But I want to do something like this:

    String.prototype.replaceAll = function(replaceThis, withThis) {
        this.replace(/replaceThis/g, withThis);
    };

But obviously this will only replace the text `&quot;replaceThis&quot;`...so how do I pass this variable in to my regex string?

How do you use a variable in a regular expression?

I have an HTML string representing an element: `&#39;&lt;li&gt;text&lt;/li&gt;&#39;`. I&#39;d like to append it to an element in the DOM (a `ul` in my case). How can I do this with Prototype or with DOM methods?

(I know i could do this easily in jQuery, but unfortunately we&#39;re not using jQuery.)

Creating a new DOM element from an HTML string using built-in DOM methods or Prototype

I really need a localized dropdown calendar. An English calendar doesn&#39;t exactly communicate excellence on a Norwegian website ;-)

I have experimented with the **[jQuery DatePicker][1]**, their website says it can be localized, however that doesn&#39;t seem to work.

I am using ASPNET.MVC, and I really want to stick to one javascript library. In this case jQuery.

The ajax toolkit calendar would be acceptable, if only it too would display Norwegian names.

**Update: Awesome! I see I am missing the language files, a not so minor detail :-)**

  [1]: http://ui.jquery.com/demos/datepicker/#localization

How do I localize the jQuery UI Datepicker?

I have this label control in my web page

    &lt;asp:Label ID=&quot;Label1&quot; runat=&quot;server&quot; Text=&quot;test&quot;&gt;&lt;/asp:Label&gt;

And when the page rendered the id of the control changes to something like this

      &lt;span id=&quot;ctl00_ContentPlaceHolder1_Label3&quot;&gt;test&lt;/span&gt;

How can I stop asp.net from changing IDs in order to perform a jQuery operation like this

    $(&#39;#label1&#39;).html(xml);


How to stop ASP.NET from changing IDs in order to use jQuery

I have a system where I send an Ajax command, which returns a script block with a function in it. After this data is correctly inserted in the DIV, I want to be able to call this function to perform the required actions.

Is this possible?


Calling a JavaScript function returned from an Ajax response

Which AJAX library is the best for django and why?   
Looking for one with a large database of tutorials, books and detailed documentation.  
Which one is the easiest to work with?
Which one is in early development but shows great promise for the future?&lt;br /&gt;&lt;br /&gt;

Regards,  
chriss 

What is the best AJAX library for Django?

I am opening my blog page in my website. The problem is I can give a width to an iframe but the height should be dynamic so that there is no scrollbar in the iframe, and it looks like a single page...

I have tried various JavaScript code to calculate the height of the content but all of them give an *access denied permission* error and is of no use.

    &lt;iframe src=&quot;http://bagtheplanet.blogspot.com/&quot; name=&quot;ifrm&quot; id=&quot;ifrm&quot; width=&quot;1024px&quot; &gt;&lt;/iframe&gt;

Can we use Ajax to calculate height or maybe using PHP?


Resize iframe height according to content height in it

I&#39;m currently coding a French website. There&#39;s a schedule page, where a link on the side can be used to load another day&#39;s schedule.

Here&#39;s the JS I&#39;m using to do this:

		&lt;script type=&quot;text/javascript&quot;&gt;
		function load(y) {
			$.get(y,function(d) {
				$(&quot;#replace&quot;).html(d);
				mod();
			});
		}
		function mod() {
			$(&quot;#dates a&quot;).click(function() {
				y = $(this).attr(&quot;href&quot;);
				load(y);
				return false;
			});
		}
		mod();
		&lt;/script&gt;
The actual AJAX works like a charm. My problem lies with the response to the request.

Because it is a French website, there are many accented letters. I&#39;m using the ISO-8859-15 charset for that very reason. However, in the response to my AJAX request, the accents are becoming ?&#39;s because the character encoding seems to be changed back to UTF-8.

How do I avoid this? I&#39;ve already tried adding some PHP at the top of the requested documents to set the character set:

    &lt;?php header(&#39;Content-Type: text/html; charset=ISO-8859-15&#39;); ?&gt;

But that doesn&#39;t seem to work either. Any thoughts?

Also, while any of you are looking here...why does the rightmost column seem to become smaller when a new page is loaded, causing the table to distort and each `&lt;li&gt;` within the `&lt;td&gt;` to wrap to the next line?

Cheers

jQuery AJAX Character Encoding

Is a URI (specifically an HTTP URL) allowed to contain one or more space characters? If a URL *must* be encoded, is `+` just a commonly followed convention, or a legitimate alternative?  

In particular, can someone point to an RFC that indicates that a URL with a space *must* be encoded?

**Motivation for question:** While beta-testing a web site, I noted that some URLs were constructed with spaces in them. Firefox seemed to do the right thing, which surprised me! But I wanted to be able to point the developers to an RFC so that they would feel the need to fix those URLs.

Is a URL allowed to contain a space?

I&#39;ve looked around but haven&#39;t been able to figure out if I should use both an ETag &lt;strong&gt;and&lt;/strong&gt; an Expires Header &lt;strong&gt;or&lt;/strong&gt; one or the other.

What I&#39;m trying to do is make sure that my flash files (and other images and what not only get updated when there is a change to those files.

I don&#39;t want to do anything special like changing the filename or putting some weird chars on the end of the url to make it not get cached.

Also, is there anything I need to do programatically on my end in my PHP scripts to support this or is it all Apache?

ETag vs Header Expires

What&#39;s the difference when using `GET` or `POST` method? Which one is more secure? What are (dis)advantages of each of them?

([similar question][1])

  [1]: https://stackoverflow.com/questions/46585/when-do-you-use-post-and-when-do-you-use-get

When should I use GET or POST method? What&#39;s the difference between them?

I understand it&#39;s a standard practice to look at both these variables. Of course they can easily be spoofed. I&#39;m curious how often can you expect these values (especially the `HTTP_X_FORWARDED_FOR`) to contain genuine information and not just be scrambled or have their values stripped away?

Anyone with the experience or statistics on this stuff?

Is there anything else that can be useful for the task of getting the client&#39;s IP address?

How can I get the clients IP address from HTTP headers?

How can I detect on the server (server-side) whether cookies in the browser are disabled? Is it possible?

**Detailed explanation:** I am processing an HTTP request on the server. I want to set a cookie via the `Set-Cookie` header. I need to know at that time whether the cookie will be set by the client browser or my request to set the cookie will be ignored.

How to detect server-side whether cookies are disabled

Is there an easier way to setup the http client for preemptive basic authentication than what described [here][1]?  
In previous version (3.x) it used to be a simple method call (eg, `httpClient.getParams().setAuthenticationPreemptive(true)`).  
The main thing I want to avoid is adding the BasicHttpContext to each method I execute.


  [1]: http://svn.apache.org/repos/asf/httpcomponents/httpclient/branches/4.0.x/httpclient/src/examples/org/apache/http/examples/client/ClientPreemptiveBasicAuthentication.java

Preemptive Basic authentication with Apache HttpClient 4

When a server allows access via Basic HTTP Authentication, what is the experience expected to be **in a web browser**?

Ignoring the web browser for a moment, here&#39;s how to create a Basic Auth request with `curl`:

    curl -u myusername:mypassword http://somesite.com

But what about in a Web Browser? What I&#39;ve seen on some websites, is I visit the URL, and then the server returns response code 401. The browser then displays a username/password prompt.

However, on somesite.com, I&#39;m not getting an authorization prompt at all, just a page that says I&#39;m not authorized. Did somesite not implement the Basic Auth workflow correctly, or is there something else I need to do?


HTTP Basic Authentication - what&#39;s the expected web browser experience?

I&#39;m building a REST web service client in PHP and at the moment I&#39;m using curl to make requests to the service.

How do I use curl to make authenticated (http basic) requests? Do I have to add the headers myself?


How do I make a request using HTTP basic authentication with PHP curl?

I have a question about HTTPS and HTTP Authentication credentials.

Suppose I secure a URL with HTTP Authentication:

    &lt;Directory /var/www/webcallback&gt;
    AuthType Basic
    AuthName &quot;Restricted Area&quot;
    AuthUserFile /var/www/passwd/passwords
    Require user gooduser
    &lt;/Directory&gt;

I then access that URL from a remote system via HTTPS, passing the credentials in the URL:

    https://gooduser:secretpassword@www.example.com/webcallback?foo=bar

Will the username and password be automatically SSL encrypted? Is the same true for GETs and POSTs? I&#39;m having a hard time locating a credible source with this information.

HTTP Basic Authentication credentials passed in URL and encryption

Using Apache, it is quite simple to set up a page that uses basic access authentication to prompt a user for a name/password and use those credentials in some way to grant access to that user.

Is this secure, assuming the connection between the client and server is secure?

Content Type	Original Author	Original Content on Stackoverflow
Question	system PAUSE	View Question on Stackoverflow
Solution 1 - Javascript	Alnitak	View Answer on Stackoverflow
Solution 2 - Javascript	splattne	View Answer on Stackoverflow

Pure JavaScript code for HTTP Basic Authentication?

Javascript Problem Overview

Javascript Solutions

Solution 1 - Javascript

Solution 2 - Javascript

What is the best way to clear the CSS style "float"?

C++ virtual function from constructor

Attributions