Hey guys I am really messing up with this.
This is I'm doing: If there are 100 users to fetch from Database, I'm using pagination and showing 10 users at a time. when user will click on next page, he will get next 10 users through ajax(called ajax on click) and so on. I'm showing 10 page-links right now with first, next last and previous links.
This is how flow will go: On a.php created links and called ajax function with every link, passing url(b.php) & target(where I will get result), with url also passing clicked pageno., this pageno. will go to b.php and next 10 users will be shown with the help of ajax.
This is the problem: Currently I'm showing 1-10 links with first and last links, unable to show next and previous links because to redirect to next or previous, I am not getting the current page number on a.php i.e i'm passing to b.php. also links are created in foreach loop.
I am trying hard to get this done, but no success yet.
waiting for valuable reply.
Ok, I think I understand...
I think what you need to do is store the current page number as a JavaScript variable. Use the function that is doing the Ajax to update this variable and also update the next/previous links.
Hope this helps.
Update:
On second thoughts, here's a better idea. Having your ajax call directly in your link means you have to put together a url and update it, which is awkward and annoying. This isn't ideal. Instead it is better to store the variables and have some set functions work with them in a set way. So, you could have something like:
<a href="javascript:void(0)" onclick="gotoNextPage()">
Rather than passing them the number of the page to go to, you can store the current page number in a javascript variable and do something like this:
gotoNextPage(){
// lets assume the current page number is stored in a
// variable defined outside of this function called curr_page
curr_page++; // increment the current
call_ajax('user_info.php?pageno='+curr_page);
}
This way the code for the link doesn't ever change.
You can still pass other variables (such as 'order', 'perpage' etc) to gotoNextPage() but you might find you don't need to.
A couple of things to bear in mind:
1. Using jQuery or something similar would probably make things easier for you.
2. Anyone without javascript enabled will not be able to use your site. Consider changing it to something like
<?php
echo '<a href="your_main_page.php?page_number=', ($curr_page + 1), '" onclick="gotoNextPage()">';
?>
This way it would work for via the ajax method but would also work (if not as smoothly and with a page reload) for people without javascript. It's a bit more work for you though...so hat's your choice!
Hope this makes sense. It's been a long day!
Related
OK - Thanks for taking the time!
I am using WP on a CentOS 6 server. I have a plug in with the functions, I have a function that makes a DB call and populates relevant products based on $_GET variables, I took from one of the other project and modify it so it works! But here where I run in to the problem, I go to the main page and i have a function that gets called first, goes through the URL name and determines the categories id and then from that I need to pass that to the URL so that when the next function then calls $_GET["category_id"] and that ID is there and ready to be use and it it does its magic. (all staying on the same page no refreshing or anything)
So I need to put that on the URL as the page is being loaded and so that I can use it (Again i get the variables from a function that is doing all the work with the address for relevant info,) So how do i do it? HTML or PHP, and a straight forward way no extra installs would be nice :)
Edit 1:
So is there something then I could integrate in that would be simple and straight forward that would allow me to do a mini refresh and get the right variables in place, never used JavaScript but seams to be getting or something in php ... Ideas are welcome :)
You can with javascript and the history API
The only way you can change the url without actually redirecting the user is by using the pushState method.
e.g. open a console and copy and paste this:
var stateObj = { foo: "bar" };
history.pushState(stateObj, "changes url to stackoverflow.com/yes-you-can", "/yes-you-can");
You won't be redirected, and the url of your browser will change unless, basically, you're using IE 9 or less. You can see a demo of this on html5demos.com
OK here is how I am going to get around this problem I am having
I made a new table in the DB and then I already have a list of the Domain We are using, so then I am going to give to the customer there are three columns and they will manually enter the fields and it will be on them to manage and change what they want displayed on the webpage.
CVS import and then BAM! done! just pull $_SERVER["SERVER_NAME"] and then compare that to the domain column and done! (I will have what ever cat's and sizes they want and it will not be on us to create any complicated functions and if statements for exceptions and it is in there hands!)
Not the exact answer I wanted to get but much easier and not so much complicated :)
IS there a way to post a $var to $PHP_SELF so that I can use it further down the script?
After 2 hours reading dozens of questions which helpfully appear in the sidebar to the right,
it became apparent that they pretty much all assume an HTML Form has been / will be
activated.
But psuedo~code of what I need looks more like this:
< php
$someVariable=y;
$otherVar=X;
// and the usual setup for accessing the `$_POST` of php:
$HokeyDino=`$_POST`["SendOFF"];
$SendOFF=101;
// etc. and then come to a point where I need the script to just automatically post a value
[ the lack of knowledge ]
// which if I had tha codez!
// would permit the use of that $var, $HokeyDino ...
if($HokeyDino==100){
// do stuff
}
I don't like looking foolish, but gotta ask away, because I figure I have missed learning some elementary aspect of programming, being self-taught so far, but not knowing what might be lacking makes it hard to go look productively.
Thanks very much!
EDIT // Clarification.
Wow, this is amazing. half an hour, 24 people reading the question. Blows my mind.
Right. What I have gotten done so far to give more background:
A php script which uses fopen to create on the fly another php / html page, and all the
code on the Authouring originating script, to write (a+) to the newly created temp page, the whole thing.
From a loop on the authouring page, I have code for retrieving POSTS I send TO that temp page, and that code gets written to a very temp page... then I cause the first part of the page to be written, to get placed on the Temp page, by put_contents etc.,
Next, from another loop on the Authouring page, I write code which item by item matches the things which were included in the < head > of the Temp page.
Anyhow, without graphics, it's a bit tough to explain. What I have at the point I have gotten to so far, is the newly created/assemble Temporary page, can be accessed as a WebPage,, and a button click on it, will successfully POST a value back to the originating/Authouring script.
Here's the tricky part: There isn't any way I was able to devise, to dynamically create code ON THE AUTHOURING page, to recieve POSTS from the Temp Page.
But I realized that if, in the Loops on the Authoring Page, I was able to $PHP SELF post a
string which would be the code for creating a * $Var = $ POST; to catch the values from button clicks on the TEMP page, it would work.
Critical, is that the Authoring Page, doesn't know how many buttons will be made over on the Temp Page ~ that depends on the number of items in the database, which the loops are reading and translating into code which builds the Temp Page.
So, there is no way to hard~code, on the Authouring Page, all possible code for recieving posts, but I could use one Universal $Var= $ POST[ X ] if I could generate it on the fly in the loop, on the Authoring Page.
Hence the need to write code which will $SELF POST, and have it triggered just by normal programme flow, and not the click of a button in a form.
Hmm.... clear as mud yet? :) the question still is pretty straight foreward.
Cheers!
//// Loop
Create CViewerTemp
read DB and manipulate data
Loop B
create, and write to VeryTempHead page
code which creates the top of CViewer, HEAD items
create, and write to VeryTempBody page
code which will work there, items one by one matching head items
end Loop B
Write code which is 1ne time only stuff, to begin CViewer.
then transfer the stuff from VeryTempHead page, into CViewer, kill
VeryTempHead
then transfer the stuff from VeryTempBody to CViewer, kill Very Temp Body.
Open CTempViwer, click on a Button, a value gets posted to Authouring Page.
Authouring Page doesn't recieve anything, no code to do so exists [YET! :)]
If you want to create data on the fly, but not from $_POST, you can just populate $_POST from any other source like this:
<?php
// some calculations
$_POST['my_var'] = $some_calculated_stuff;
// later in your code
if(isset($_POST['my_var'])) {
// works as if it had been posted
}
?>
Is this what you're looking to do?
It's a bit hard to follow, so I'll suggest another potential:
Have you taken a look at cURL?
I think you mean hidden input fields. You can print them with php and they will be posted to your next php script.
Please note, that the user can change the values and you shouldn't trust them.
Also, you can consider using $_SESSION. That would be the better way to solve the task.
Please note that you shouldn't use PHP_SELF because it's insecure.
I'm making a page which shows data, which is quite enormous.Tried pagination on it but didn't work the way I wanted. I'm looking for, something like "See more results", which on clicking will increase size of the page. Further, is it possible to do it with some limit on content to be shown on every click, like on every click it should show, say 10 or 15 rows ?
The best way to do this, in my opinion, is to cut the text and load just part of it with PHP. In this way the initial page won't be heavy. Then with a ‘Read more...’ button you can send an ajax request (with jQuery, maybe using the function load() function) you can get additional text, which will be appended in a div after the current text. Additionally, if you want to retrieve just some lines each time you press the button, you can check with jQuery how many div are already added (just adding a class to your new divs, you can check this just with $('#NameOfTheparent div.classOfTheNewDivs').length) and pass the variable to PHP, during the ajax request (so it won't be $('newDiv').load('something.php') but $('newDiv').load('something.php?var=numberOfDivAlreadyLoaded').
Well, this is the concept. :P
in my opinion, you need something like this:
http://andylangton.co.uk/articles/javascript/jquery-show-hide-multiple-elements/
I would like to display one image at a time on a webpage. I used a query to get a set of images from the database into an array. I have tried along these lines:
$my=& JFactory::getUser();
$db=& JFactory::getDBO();
$a=& $my->id;
$query="SELECT id FROM jos_phocagallery_categories WHERE accessuserid='$a'";
$db->setQuery($query);
$r=$db->loadResult();
$queryc="SELECT filename FROM jos_phocagallery WHERE catid='$r'";
$db->setQuery($queryc);
$results=$db->loadResultArray();
$image=current($results);
echo 'imgag srx="images/phocagallery/'.$image.'" />';
I changed echo line above because the line was not allowed
After this code I've tried to add an input button that calls "next($results)" and then replace $image, but it seems the whole query is beeing implemented from the beginning again. So I can't get the pointer of the array to step forward. Not even in an echo.
What Am I doing wrong?
Regards / Viktor
If you are reloading the page to get to the next image, then you are going to need to pass the ID or array key to the next page so it knows where you left off. The other option would be to step through the array without reloading the page, instead using some Javascript to load the next image and replace the current one when the button is clicked.
EDIT
Ok, with that info you will definitely need to use some Javascript to make it work. Even though Joomla comes with Mootools, I prefer jQuery partially due to the availability of plugins to do all sorts of stuff. I didn't look too hard, but this carousel image plugin could be very easily modified to do what you like by simply changing it to display one image at a time instead of three.
http://www.gmarwaha.com/jquery/jcarousellite/index.php
With a little Googling you might even be able to find an exact match.
Further to my question yesterday (here), I am working on a webpage that has a section that shows 'live' order details.
The top half of my webpage has Spry Tabbed Panels. One of the panels contains an include call to a separate php page that I have created (getOpenOrders.php). This contains an SQL query to obtain all open orders and then puts the details into a table.
As a result, the table of open orders is shown in the Spry panel. What steps do I now need to take to have this refresh every 15 seconds?
Do you really want to call the database every 15 seconds for each user? isn't that an overload?
I'm not saying that your database will be overloaded, but, thats how you shouldn't do things!
Edited
you should show an image, or the link to that page in order to gt an appropriate answer, because it all depends in what are you doing in the table.
because I don't know, I will give you an answer on what probably is happening.
Because you said that you're new to the ajax world, let's make things simple, and not to complicate on the you should return a JSON object and use it to re populate your table. :)
So we will start with 2 buttons (Previous and Next) so the user can move the data that is showing (you probably don't want to give him/her 100 lines to see right?)
let's say that you have 2 pages, a showData.php and getTable.php, in the showData.php you will need to load jQuery (wonderful for this) and add a little code, but where the table is to be placed, just add a div tag with an id="myTable" because we will get the data from the getTable.php file.
getTable.php file has to output only the table html code with all the data in, without no html, body, etc... the idea is to add inside the div called myTable all the code generated by getTable.php
Let's imagine that getTable.php gets a page variable in the queryString, that will tell what page you should show (to use LIMIT in your MySQL or PostgreSQL database)
You can use jQuery plugin called datatables witch is one of my choices, check his example and how small code you need to write! just using jQuery and Datatables plugin.
The first description follows the jQuery.Load() to load the getTable.php and add as a child of the div and wold do this for the previous and next buttons, passing a querystring with the page that the user requested. It's to simple and you can see the website for that, if you prefer to use the DataTables plugin, then just follow their examples :)
if you, after all this need help, drop me a line.
<META HTTP-EQUIV=Refresh CONTENT="15; URL=<?php print $PHP_SELF ?>">
This should be in between the head tags.
-or-
header('Refresh: 15');
This should be before the head tag and directly after the html tag.
As said by balexandre, a different method should be used. One that does not require a database hit every 15 seconds for every single user that is connected to the site. But, there is your answer anyways.
Although, balexandre makes a very good point, if you do decide that you need a refresh, you could simply do something like this in your JavaScript:
window.onload = function( )
{
setTimeout( 'window.location.refresh( )', 1500 );
}
(I've not tested the above code, so syntax may need to be tweaked a little, but you get the idea)