I have a drop down menu, after selecting a value and clicking submit you're sent to another page with a table displaying query results retrieved using the value. The table uses pagination to split the results after 5 records with next and previous links, but when you click on the next page the value is lost and with it the results.
I tried using sessions,
In page.php
session_start();
$id = $_GET['id'];
$_SESSION["selectedID"] = $id;
include "table.php"
And in table.php
$selectedUserID = $_SESSION["selectedID"];
But it's not working, any idea what I'm doing wrong?
You also have to put a session_start(); in your table.php
first, I imagine you are using post method for your search/filter, that's not recommended (my opinion), use always get method, next, maybe this pagination php class can help you.
Regards
Related
I am creating a set of 3 pages, each with a dropdown menu. The values from the previous dropdown menus will populate the next dropdown menu. I understand that I must use session variables to hold the value of each dropdown menu into later pages. As a simple test, I echo the variables to see if they have been carried over -- and that's where the problem is.
I have three different files: choose_cc.php, choose_uni.php, and choose_major.php
The value from the dropdowm menu in choose_cc.php does get echoed in choose_uni.php -- however the value from choose_cc.php does NOT get carried over into choose_major.php -- despite me storing it into a session variable.
the flow of pages is like this;
choose_cc.php --> choose_uni.php --> choose_major.php
Each php file has it's own form. The problem lies in when I try to call the value from choose_cc.php into choose_major.php, i have issues.
The name of the form on choose_cc.php is choose_cc.
The name of the form on choose_uni.php is choose_uni.
So for example, in choose_uni.php, I retrieve the value from the dropdown menu on the previous page (choose_cc.php) like this:
$_SESSION['choose_cc'] = trim($_GET['choose_cc']); //fetches cc from previous page
$user_cc = $_SESSION['choose_cc'];
echo $user_cc;
and when I echo it as I did above, it works! Okay perfect!
But when I head onto choose_major.php, I try retrieving the value again from the form, but to no avail like this;
echo $_SESSION['choose_uni']; //this works
echo $_SESSION['choose_cc']; //this doesn't work
I have made sure to store to do session_start() on the beginning of each page as well.
Please help me out! this is driving me insane!
Create a new "see.php" with this:
session_start();
print_r($_SESSION);
and execute it after each choose_cc.php, choose_uni.php and choose_major.php to take a look the session you have after you run your programs.
Simple as this:
a) add session_start(); at the beginning of ALL the involved pages. Some weird stuff happens sometimes if you put a space before it, or even a new line. So be sure it is the very first thing in your script.
<?php
session_start();
?>
b) if needed, check the variable to save into session for not empty(); That way you can be sure the session variable contains something, unless of course you want explicitly to be empty.
c) then load the session variable. You can temporary check it with a var_dump();
<?php
session_start();
if (!empty(trim($_GET['choose_cc'])))
{
$_SESSION['choose_cc'] = $_GET['choose_cc'];
}
var_dump($_SESSION['choose_cc']);
?>
I've got a php script which builds a html table via echoing data, But i want to add a link onto one of the values and pass that value to the next page.
<td><a href='redirect.php'><?php $_SESSION['WR'] = $row['WorkOrdRef'];echo $row['WorkOrdRef'];?></a></td>
is the line in question but this will only pass the last value added to the table.
Oh, it doesnt work like this. the php code gets executed no matter if you click the link.
I guess the easiest way to do this is to pass it as a get parameter.
html page:
<?=$cellContent?>
redirect.php:
$clickedcell = $_GET['clickedcell']
now the $clickedcell will have the data from the previous page about what cell did the user click.
If you want to use session for some reason, you still have to pass it with GET or POST and store it after the user clicks.
hopefully this is understandable and good luck with your project.
you can change the session by get method also it is possible building by javascript
in the same page add this
if(isset($_GET["clicked"])){
$_SESSION['WR'] = $row['WorkOrdRef'];
$redirect'<META HTTP-EQUIV="REFRESH" CONTENT="0;URL='.$adres.'/"> ';
return $redirect;
}
and then change your url
<td><?php echo $row['WorkOrdRef'];?></td>
Is it possible to remove a value whilst the page is loading?
I'm using OSClass, and on one of the pages it's by default adding a value for region (cambridshire):
I need to clear this value since it's causing problems, everytime I type something else in, by default, it registers it as Cambridgeshire...
If I look at code for it:
It's being generated by a function (can see my JQuery attempt to clear it which hasn't worked).
Then if I search the function is splits up in many different parts, so I don't know where to go from there.
Basically, is there a way to remove the value when page loads and save the new value when the user submits?
JSFiddle - Note it won't display anything due to the way code is generated
Have you tried removing <?php ItemForm::region_text(); ?> on it's own? Or passing an empty string <?php ItemForm::region_text(''); ?>
I'm not familiar with OSClass though I'm afraid.
Paste this code below the jQuery initialization:
$(document).ready(function(){
$("#region").val('');
})
SAME PAGE RESULTS: (xmain.php)
//FORM (working good)
<form name="search" action="xmain.php" method="post">
code,code,code,
// QUERY (working good)
code,code,code,
<input type="submit" name="doSearch" value="doSearch">
//These are last 2 lines of my 15 line query - I have skipped the rest to save space:
$sql = "SELECT SQL_CALC_FOUND_ROWS * FROM $tableName $qryWhere LIMIT $start, $limit;";
$result = mysql_query($sql);
// Table query results here.....
OK, although all code is working correctly ( Form is submitting variables, database results are correct, etc, there are 2 nagging problems:
1 - ALL database results are echoed when the page is first loaded. The page is refreshing from top to bottom without a stop in between - I would like for NO RECORDS to be shown at first page arrival.
2. Also, because of the top to bottom nature of this page,my option choices are being reset upon form submission. I would like to maintain selections until the RESET button -
that I have on the page for that purpose is clicked.
I realize that the form by always refreshing upon itself, is causing the above problems.
Any suggestions would be greatly appreciated! - see working sample here:
http://www.symbioticmusicpublishing.com/database3/xmain.php
Only show something when something is actually posted, so surround with if(isset($_POST['doSearch']){.. or something.
echo a value <input .... value="'.(isset($_POST['thisinputname'])?htmlspecialchars($_POST['thisinputname']:'')">
On more elaborate forms a session could be handy, not needed for simpler ones/forms always getting the post though. BTW, I prefer using GETs for listing data, makes it easier to share/link. POSTs for alterations, GETs for retrieving (and a few other methods for real REST).
Echo the retrieved values inside a if statement like Wrikken suggested. Check that your form submission button is actually clicked and only then echo the results.
If you're unfamiliar with the syntax take a look at ternary operator.
http://www.php.net/manual/en/language.operators.comparison.php
Also use GET if you are getting data from database. And POST when you are putting data into database. I guess the reason why goes beyond the naming convention but still it's a nice reminder: GET for getting and POST for posting/putting.
UPDATE
Sorry I didn't think this one through. Put the sql query inside a if statement. Put also the echoing of results inside a if statement.
if (isset[$_POST['doSearch']]){
//make the query
}
if ($sql){
//echo the results
}
This is the page, its a wordpress powered site:
http://bit.ly/9oJXWV
You select some value, it makes POST to same page and based on value you selected it makes a list pages.
Now before you jump into my code i just want to say that im a newbie and that my main problem here were database queries so i didnt focus on other small stuff(like bunch if's at start inline css and stuff like that).
So this is my template:
http://pastebin.com/HQvMq3Db
This is a function from functions.php which im using in template:
http://pastebin.com/fWKqqzQv
This page works the way i want it and i just finnished putting all the code together but have one issue. Once i get that sorted out i will make the code a lot nicer... :)
So the issue is that if you look at pages that are listed once you make a selection and submit, on a lot of them some values are missing even thought those values are there(open any page from that list which is missing some value and you can pretty much see the same stuff but now it display's all the data).
So that is the part i need help with debugging. I really have no idea how to tackle this.
Second part of this question is simple: how do i paginate this page? Any link, tip, tutorial would be good.
Also one more thing, how can i have links for example like this:
.../hostels/?grad=Beograd
and when user opens up that page he does not have to click to select the town, it would already list all pages from "Beograd"? I guess that is GET request right? Can i do something like that with POST? O_o Not sure what to do here, like i said im newbie.
Thanks for reading, looking forward to answers and comments.
Cheers!
You can set up your functions to enable pagination in WP without have to do any custom logic.
See: http://codex.wordpress.org/Template_Tags/query_posts#Pagination_Parameters
and when user opens up that page he does not have to click to select the town, it would already list all pages from "Beograd"? I guess that is GET request right? Can i do something like that with POST?
yes. yes. no.
GET requests retrieve the variables from the url. so you just run a link with GET variables, the php would suscessfuly display your info. but if you are using POST, the variables are retrieved from "the background", passed by the previous page. so you cannot just run a link, the page must be called from a previous page (trough a form) or the page won't have access to the variables.
1) I fixed pagination simply by implementing &paged='.get_query_var('paged') to my query. Now it looks like this:
$hostels = new WP_Query('post_type=page&meta_key=Grad&meta_value='.$grad.'&posts_per_page=60&orderby=title&order=ASC&paged='.get_query_var('paged'));
#js1568 i gave him +1 for his answer, but he didnt answer my entire question.
Now i can go through pages like so:
/acommodation/hostels/?city=beograd - this is page 1
/acommodation/hostels/page/2/?city=beograd - this is page 2
/acommodation/hostels/page/3/?city=beograd - this is page 3
etc...
2) The issue with missing info from some pages is fixed by putting this below the end of inner loop:
wp_reset_query();
and also i created some custom function which will get all meta values for given post id:
function custom_get_meta_values($id){
$first_array = get_post_custom_keys($id);
foreach ($first_array as $key => $value) :
$second_array[$value] = get_post_meta($id, $value, FALSE);
foreach($second_array as $second_key => $second_value) :
$result[$second_key] = $second_value[0];
endforeach;
endforeach;
return $result;
}
In my inner loop i call that function like this:
$result = custom_get_meta_values($post->ID);
Then i just echo what i need like so:
echo $result['Mail'];
Just put the name of meta field in that $result array and echo it.
3) I replaced POST with GET request so now i can have links like this:
/acommodation/hostels/?city=beograd
which when opened will show every hostel from 'beograd'. I only have 4 possible values for cities so if value of 'city' that i capture from GET request is not one of those 4 values, i do nothing, just show that form. If it is i take that value and show the list from that city.
As per Will instructions, i will mark this answer as accepted.