Getting Started With Javascript And AJAX
Aug 30, 2006
I'm interested in learning Javascript with an eye towards using it for
client-side user interfaces for web services, and I have a couple
questions.
First -- In reading some of the archives here, I've noticed a fairly
strongly held opinion that it is better to write purpose-built
Javascript than to use large libraries. Since this was what I was
planning on doing anyway, because of the size of the libraries and
compatibility quirks with Safari, it's nice to hear confirmation from
experts. That said, is the code in Prototype, Scriptaculous, and
OpenRico good enough to be worth reading and emulating?
Second -- I do much better with dead-tree references than with the
web, especially as a lot of the links that come up when I google for
Javascript topics are tutorials for the clueless by the clueless.
(Perl has the same problem, but with Perl I have enough knowledge to
filter the useful bits from the flat-out wrong bits.) Aside from the
O'Reilly Javascript reference (which I have) and _Ajax Hacks_ (which I
also have), are there other good references I should get my hands on?
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Dec 6, 2010
Via Textpattern I am trying to create a vertical scroll of text on this page, bottom left below the html marquee I am trying to supersede:[URL]... It simply shows all my text without scrolling. Anyone have any clues as to what I might be doing wrong?
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Aug 27, 2009
I need to return several values and I'd rather do it all in one ajax call. However there doesn't seem to be anything in data. Perhaps I'm way off here.
[Code]...
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Dec 3, 2010
Is there a way to delete old threads that I started? They have links to my website and I'm still getting hits from users. The website no longer contains information referenced in the threads. The threads do not have the "Edit" button any longer.
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Aug 9, 2010
Need som directions to find my way. First contact with jQuery. I want to auto refresh part of a page in a WordPress blog. already have a page geting the resoult i want from a include_result1.php and include_result2.php Want to make this results to be updated for visitor every 1 second. I am Using this:
<script type="text/javascript">
jQuery(document).ready(function() {
jQuery("#responsecontainer").load("include_result1.php
");
jQuery("#responsecontainer").load("include_result2.php
[Code]...
When i run this page the result from 1 and 2 keeps blinking alternation from one to another. It is very ugly. Is there a way to get this results beeing updated but in a quietly way as live content?
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Jan 15, 2011
ok, here's the background on my "lets learn jquery" debacle ... I have downloaded it (plus the UI) and that demo index.html loads and functions perfectly.
well, I can create a brand new .html document, and include just the jquery.js and perform something, and it will work ... here's the thing, if I change *anything* in the source file, the content in firefox will not refresh ... I could even delete random tags, including the <body> tags, the <h1> tags and text ... and it will just not carry over to the browser. And, if I view the source on firefox it will show a random amount of lines removed from the bottom of the .html file
what in the world is happening ... it is driving me crazy that i cant figure this out. (btw i'm using jquery1.4.4 on centos5.4 + apache2.3.3, and firefox3.6.6 from win7 if it matters)
to recap, if i start with a blank/fresh/from scratch file it will work as designed ... but as soon as I change anything, adding or removing code/content, it blows up randomly displaying content (even old content that isnt even saved in the .html file anymore!)
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Oct 20, 2010
jQuery fileTree would like to display only {.php, .txt, .etc} files on the "Getting Started" forum and it still is not showing up on the list.
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Apr 22, 2009
Im having a bit of trouble with the bounce show effect from jquery ui. To see what I mean, check out my development site. Anytime you modify a part in this computer builder, the rigth side gets updated. Right now its removing and adding list items. Problem is when click items too fast, the animation doesnt finish and the next item gets bumped lower and lower.
[Code]...
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Apr 28, 2006
Ok so, this is my purpose:
- to be able to load asynchronously (via AJAX) some javascript ads (like google's or adbrite) so as to make them be loaded in the background, then update the page after the ads have loaded via innerHTML
Why?
-Because 90% of the time in my newer sites, javascript ads are the major offender in terms of speed of page rendering
My problem:
Via ajax, I can call a php file that retrieves some javascript and outputs it, XMLhttprequest returns those javascript lines, but they don't render in the page, since they miss the whole page loading, and are apparently not parsed
For example, let's say I call a php file via ajax, and it returns the output into a variable named "text" containing "document.write('hello')"
if I use xxx.innerHTML=text, nothing happens
My 1st solution:
Passing those javascript lines to eval() [like eval(text) ], but this produces a second problem, that I couldn't solve (probably because of my lack of knowledge in javascipt):
if I eval the code, it deletes my current page and renders a new one
for example, if I parse a document.write, my page disappears, and a new one is rendered with the document.write text
What I want is basically to make that "document.write" appear inside a div in my page, adding to the content (and not overwriting the whole page), much like what happens when using innerHTML
Is this even possible? How would you go about it?
I tried xxx.innerHTML=eval(outputfromphpfile) but it overwrites my whole page...
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Feb 8, 2006
I am using Ajax to refresh a DIV area by setting the
innerHTML=request.responseText in the usual manner. in the response text I
have a <SCRIPT> tag in line, but this is not executed. Is there a way of
making the ajax refresh process this.
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Apr 12, 2006
If the browser disable the javascript, what happen to Ajax? can i slove
the problem by using server side script? any suggestion for this?
i currently do some dirty projects with perl/cgi, and I would like to
add more client side features which relate to ajax, and do some
validation on the client side with javascript. but it is possible that
the javascript may be disable with some browsers. what can i do if the
client's broweer disable the javascript.
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Jul 26, 2006
Is AJAX built on top of JavaScript? What browsers supported AJAX?
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Oct 15, 2006
Some servers return JavaScript as the response to an AJAX request. When
the response JavaScript is eval'ed it calls other JavaScript functions
already in the browser to update elements, etc. This seems like a good
system because it allows so much freedom in creating the desired
behavior in the browser. The required data doesn't have to be converted
to XML or JSON on the server. The browser doesn't have to have
templates for interpreting and converting this data into some change in
the browser. All of the conversion algorithms don't have to be written
and changed when new behavior is required. This remote procedure call
approach is the predominant system in the Ruby on Rails world.
(Unfortunately they are calling Prototype.js functions.)
However apparently some people seem to think this remote procedure call
approach is a bad idea. I can't see why it is so bad because it is so
lightweight and flexible. It also helps to keep the client less
intellegent which seems good in a world of incompatible client-side
bugs.
If I use some neutral data format like XML to accomdate different types
of clients then I have to write different client-side interpreters for
each type of client (browser, RSS, POP, cell phone, etc). Why not just
write different server-side code that generates the correct JavaScript
(or other) for the requesting client type?
When is the RPC approach such a bad idea?
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May 1, 2006
I'm making an ajax call to return the contents for a page using the responseText property. I want to be able to define a javascript function in the page and call it, doing something like:
<script>
function test(){
alert('hi');
}
test();
</script>
However, none of the javascript in my page works. I'd imagine it has something to do with it being included as part of the responseText and the browser is not picking it up. I haven't been able to find any info about this online anywhere. Any thoughts?
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Sep 28, 2006
Is any way to encrypt the javascrypt code ?
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Jan 19, 2007
I am a XHTML/CSS developer with an interest in AJAX. I am at the stage were I wish to learn how it's all done.
So my quesiton is this:
To develop AJAX applications do I need to learn JAVA or Javascript?
It may sound like a dumb question considering AJAX is mainly javascript and XML, however will learning JAVA first off be a benefit?
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Feb 16, 2007
I am currently creating a social network. On a profile if a user has comments they can delete them. I am running AJAX to update the database and display the comments refreshed (one deleted will no longer show). The data I am requesting includes the following...
<script language="JavaScript">
document.write("<a href="javascript:void(0)" 'CommentsTable', 'PostLink1', 'PostCommentText', 'ViewCommentsText')" id="PostLink1">Post Comment</a>");
</script>
<noscript>
<a href="comment.php?action=post&user=<?php echo $user; ?>">Post Comment</a>
</noscript>
My problem is that the JavaScript from the request does not work, I can only seem to display regular HTML. Is there a solution to this problem to make the JavaScript work or do I have to use an HTML alternative?
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Sep 26, 2007
If you have your site implemented in ajax, and client browser has disabled the javaScript, then ajax won't work?
Another question is, what if you are creating the page lay out(background color, boxes, etc) in javaScript, does it mean they also won't work?
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Dec 29, 2007
Is it just me, or is there no distinction between AJAX and Javascript nowadays? Today I saw a request for a calculator, something that should be done with just Javascript, but yet the post was seeking an AJAX developer. When did these terms become synonymous?
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Apr 12, 2006
In my browser, I make an AJAX request. The server sends me a fragment
of an HTML document. That fragment has some JavaScript inside some
script tags. How do I run these scripts when the fragment arrives at
the browser?
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Oct 3, 2006
Since XMLHTTP Request does not support loading of XML from other
servers, I decided to use a trick:
load XML into hidden iframe and then get that XML with JavaScript to
parse.
But, is this a good idea? I am stuck. How do I get XML loaded in the
iframe and pass it on to JS function for parsing?
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Mar 15, 2007
does anyone know of any way to allow for multiplayer interaction using Javascript/AJAX calls?
I am looking at two (or more) players visiting the same webpage and interacting with one another to play a text/browser based game (non-Flashed based).
Any ideas on how to do this using JS/PHP and mySQL?
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May 12, 2011
I can't seem to figure out what I'm doing wrong with this no matter how many things I try. I've looked through Google for a related issue but found nothing specificThe script runs through a external .js file calling a list of music albums, then listing the song of the album chosen via ajax. The user can then edit of delete the songs. Everything works fine until I submit the edited information through a form. When I click the submit button I get a web developer error "updateSong is not a function"Here's the form which is loaded into the already existing page via ajax:
<?php
include("database.php");
$song = $_GET['song'];
[code]....
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Sep 29, 2005
I would like to build an HTML page that has four content areas. The first with 3 links that when clicked chage what is shown in the other 3 - and so changing the default content in these sections. The content for these sections will be contained in seperate HTML files sitting on the same server.
I understand this can be done without refreshing the page and believe JavaScript and Ajax is the best method to do this. Any advice?
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Feb 28, 2007
I am currently running a website for a medium sized company that has an application which relies heavily on AJAX. Currently, I am using DOJO, and it does a great job when it comes to cross-browser compatability. It comes with so many extras, and clients are forced to download these extras!! I have looked around at various other Javascript applications, and, while some vary in size, it seems that they are all quite large. Are these toolkits neccessary for a functioning ajax application? Must clients download an extra 30 - 150kb of js to use AJAX? In an attempt to solve this problem, I threw a script together with some help from the internet and an Ajax book that weighs in at 1.2kb. I would love to just throw this up and be done, but I don't have the testing capabilities to justify doing so. There are so many flavors of browsers, and I have access to only a few of them. Frustrating Don't really know what i'm asking, anyone else run into this frustration?
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Jun 26, 2007
I'm sure some wizard will tell me this is a classic example of "piece of cake"; in which case I bow and promise to listen In case I've struck granite rock, feel free to throw questions my way and I'll tell you if I've tried it or not.
I have a file, main.php (I know this is the JS-forum, bear with me). It outputs HTML and inline Javascript functions. When the user clicks on a graphical "tab", that tab is activated, and an ajax call is made to fetch.php with some specific parameters. Once the ajax request has completed, a given innerHTML container on the now active tab is filled with the stuff that fetch.php outputs.
So far so good.
The problem is that the stuff that fetch.php outputs is partial pure HTML and partial inline javascript. And this is where it gets tricky. If I declare an inline javascript function in the returned data, Firefox (and I suspect MSIE) refuses to understand that the function is there. It simply doesn't exist (!).
Using the Web Developer add-on for Firefox, there's an option to look at "Source code" and "Generated source code". The output from these two differ in that when I view the "Generated source code", I see the dynamically inserted javascript/HTML from fetch.php, whereas viewing "just" the source doesn't.
What did I do wrong? How do I get the browser to find/accept/activate the javascript code/functions that were inserted dynamically? I cannot put them in a .js file and include it, since they need to be dynamically created, and I cannot use eval() since that executes javascript "as is", in which a function will not be executed unless called.
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