My problem is that the database fields have been badly designed by previous people before me. We are accessing the table rows horizontally.
I am working with PHP and jQuery right now and I am passing data back and forth through AJAX. In PHP I am accessing this array like so:
$attendance['date_lesson_' . $lessonCount]
where lessonCount is a number from 1-10 that is incremented i.e. if lessonCount = 1 then above would be $attendance['date_lesson_1']
I am passing the attendance array through json_encode
How do I therefore access this field data_lesson_ 1 up to 10 in jQuery?
I am trying to do:
var lessonCount = 1;
attendance[i].date_lesson_+lessonCount
//do some stuff with attendance.date_lesson_
lessonCount++;
It was easy in PHP cause you concatenate strings with the dot "." but this isn't a string I'm dealing with in jQuery/JavaScript so how on earth would I do this?
Yes, I know. This is awkward. I agree 100%.
You’ll need to use bracket notation:
attendance['date_lesson_' + lessonCount]
Dot notation can only be used with identifier names as property names.
Just a guess, I don't know how that json looks like.
attendance["date_lesson_"+lessonCount]
Related
So i am using this PHP code to create the json output, and I am having an issue where it’s creating an array of array with the info. I would like to get rid of one array and just display the list of API’s thats been used and number that has been used.
Looks as though the difference is you have...
"apis":[{"item_search":"0\n"},{"item_recommended":"0\n"}]
and want
"apis":{"item_search":"0\n","item_recommended":"0\n"}
If this is the case, you need to change the way you build the data from just adding new objects each time to setting the key values directly in the array...
$zone_1 = [];
foreach($zone_1_apis as $api_name ) {
$zone_1[substr($api_name, 0,-5)] = file_get_contents('keys/'.$_GET['key'].'/zone_1/'.$api_name);
}
You also need to do the same for $zone_2 as well.
It may also be good to use trim() round some of the values as they also seem to contain \n characters, so perhaps...
trim(file_get_contents('keys/'.$_GET['key'].'/zone_1/'.$api_name))
I encoded a mysql result from php to json.. I need to decode it in javascript. Say my string returned is
[{"0":"x","1":"z"},{"0":"xs","1":"zz"}]
Please help me on how to get the value of a particular row and column.. for instance how to get the value of "0" of the second row.
EDIT:
Sorry for bothering friends my mistake.. the typeof returned as string JSON.parse(data) did the trick..
var data = [{"0":"x","1":"z"},{"0":"xs","1":"zz"}];
alert (data[1]["0"]);
gives you the xs
The [] represents an array structure, with each {} being an element in the array. Then, within each object there is a set of attributes, which you get it via the attribute's identifier. In this case, it's 0, so it could have just be 0 as well.
Why make objects? It is very poor coding standard to NAME attributes with a number.
Since it obviously are arrays do this instead
var x = [["x","z"],["xs","zz"]]
Then
x[1][0] will give you xs
Basically, I have working solution for this, but I'm wondering if it could (should?) be done better in some other way.
I have table I'm creating in PHP with values from MYSQL. Each item in table has multiple values. In each line there is single link and clicking on this link fires up jQuery function. In each link there is also VALUE attribute with values from multiple MYSQL fields and joined with &&:
PHP code is:
foreach ($this->_data as $l)
{
?>
...
<td>Link</td>
...
<?php
}
And jQuery function to fire up when clickin' on link is:
$(".clickMe").click(function() {
myData = $(this).attr('value').split('&&');
});
Script splits string in VALUE attribute on && and creates an array myData with values:
myData[0] => value passed from $l->_data1 in PHP
myData[1] => value passed from $l->_data2 in PHP
Is this the right way to do it?
It's fine, as long as you'll never have && in your data. You could use json_encode() in PHP and then decode this into an array in JavaScript. That would be a more standard solution.
I would recommend against using && which looks like a boolean AND. Instead I would probably use something like a pipe to separate them val1|val2.
I think you're better off passing the whole joined string in to PHP and splitting it out there. It saves you work on both ends having to put the two resultant values into the proper post or get variables to send to PHP.
Then on the PHP side, it's a little easier to validate the one value's format before splitting it, as you can use a single regex like:
// Validate both values at once: 1 or more digits, a pipe, and one or more digits
if (preg_match('/^(\d+)\|(\d+)$/', $_POST['jqueryinput'])) {
// explode() and use in PHP...
list($val1, $val2) = explode("|", $_POST['jqueryinput']);
}
I create this output with PHP:
foreach ($bk as $blink) {
$out["url"][] = $blink->url;
$out["anchor"][] = $blink->anchor;
}
$json = Zend_Json::encode($out);
echo ($json);
I want to receive and process the output with a $.ajax call.
Could you point me to a nice tutorial about multidimensional arrays with javascript/jquery or help me loop* through the json results? I got a bit confused with it.
I am trying to put those on a table, so I will be using <td>url-i</td><td>anchor-i</td> . This part, I figured out how. To put the correct values on url-i and anchor-i is the problem.
I would imagine the JSON output for that will be something like:
{'url': ['url1', 'url2', ... ],
'anchor': ['anchor1', 'anchor2', ... ]}
If that is the case, then they will be of equal length (and importantly equal indexes) and you can loop through one of the two using jQuery.each().
$.getJSON('jsonapp.php', function(data) {
$.each(data.url, function(index, url) {
var anchor = data.anchor[index];
$('#mytable').append('<tr><td>' + url + '</td><td>' + anchor +'</td></tr>');
});
});
I've not run that code, so it might have a few flaws, but that's the gist of it.
PHP can try to cast objects into arrays by itself, and for simple stuff, it usually works fine.
As for multidimensional arrays, Javascript isn't too different from most other higher-level programming/scripting languages when it comes to arrays. Really, any tutorial online on multidimensional arrays will do just fine. A multidimensional array is simply an array of arrays.
When you receive the string client-side, you just want to parse it. jQuery has its own method, but you can use JSON.parse. Afterwards, based on how you've set up your arrays, you'd want to do something like this.
<? $count = count($json_parsed['url']); for($i = 1; $i < $count; $i++) : ?>
<td><?=$json_parsed['url'][$i];?></td>
<td><?=$json_parsed['anchor'][$i];?></td>
<? endfor; ?>
This may be philosophically not the best way to do it though. If you have a whole bunch of objects and you want to make a table out of them, the best way would be to create an array of those objects as represented by associative arrays (sort of like hash tables in other programming languages). PHP natively tries to convert objects into associative arrays. I wouldn't be surprised if Zend_Json::encode does it automatically. If it does, you might want to pull simply:
echo Zend_Json::encode($bk);
If not, let me know, and we'll talk about how to do that.
You could have a look on any template frameworks, but for this exact case it seams useful to check one of those two: pure by beebole or jquery pure html templates.
Doing it by yourself might be tempting but why to reinvent the well - I know from my experience, that frameworks are about 2 times faster, then self made code.
I am looking to have a list of arguments passed across in an a URL.
$url['key1']=1;
$url['key2']=2;
$url['key3']=3;
$url['key4']=4;
$url['key5']=5;
$url['key6']=6;
$url['key7']=7;
Please Note I am trying to pass this in the URL in 1 GET variable. I know this would be better done by ?key1=1&key2=2&key3=3...etc but for reasons that are too complicated to try and explain they can't be in this format.
Any suggestions how I can convert this array into something that can be passed as 1 get var in a URL string?
Thanks in advance.
You can use json_encode() or serialize()
$myUrl = 'http://www.example.com/?myKey=' . urlencode(json_encode($url));
or
$myUrl = 'http://www.example.com/?myKey=' . urlencode(serialize($url));
Using json_encode will usually give you a shorter string, but very old PHP version might not have the json_decode function available to decode it again.
The final way would be to create your own custom encoding... it could be as simple a pipe-separated values: key1|1|key2|2|key3|3
This would give you the best option for a short URL, but is the most work.
Try http_build_query:
$url['key1']=1;
$url['key2']=2;
$url['key3']=3;
$url['key4']=4;
$url['key5']=5;
$url['key6']=6;
$url['key7']=7;
echo http_build_query($url);
//echos key1=1&key2=2&key3=3&key...
What it does is converting an array into a query string using the keys and automatically takes care of url-encoding.
EDIT:
Just read your additional requirement that it should be just one variable. So nevermind this answer.
If your problem was the proper encoding though you might want to give this another try.
Hope that helps.
The recommendation to use serialize() is fine. If space is an issue, then use a combination of bzcompress() and serialize().
However, there's a security considering that hasn't been brought up, and that's that the end user (who can see and edit this url) could manipulate the data within it. You may think it's difficult, but most of the PHP-attacking worms in the wild do this to some degree or another.
If letting the user directly manipulate any of the keys or values (or replacing it with an integer, or an object, or anything else), then you should protect your script (and your users) from this attack.
A simple solution is to simply use a shared secret. It can be anything; just so long as it's unique and truly secret (perhaps you should randomly generate it at install-time). Let's say you have in your config file something like this:
define('SECRET', 'unoqetbioqtnioqrntbioqt');
Then, you can digitally sign the serialized data created with: $s=serialize($m) using $k=sha1($s.SECRET) and make the url value $k.$s
Then, before you unserialize() do this:
$v=substr($input,0,40);
$s=substr($input,40);
if ($v != sha1($s.SECRET)) { die("invalid input"); }
$m=unserialize($s);
This way, you know that $m is the same as the original value that you serialized.
If you like, you can use the following drop-in replacements:
define('SECRET','buh9tnb1094tib014'); // make sure you pick something else
function secureserialize($o) {
$s=serialize($o);
return sha1($s.SECRET).$s;
}
function secureunserialize($i) {
$v=substr($i,0,40);$s=substr($i,40);
if ($v!=sha1($s.SECRET)){die("invalid input");}
return unserialize($s);
}
You could serialize them as key-value pairs when constructing the URL, putting the resultant serialized value in a single $_GET variable (e.g. data=sfsdfasdf98sdfasdf), then unserialize the $_GET["data"] variable. You'll need to use urlencode to make sure the resultant serialized values are URL-safe. Make sure you watch out for maximum URL lengths - 2083 characters in IE.
However, unless you really can't use key-value pairs in URLs (per your question), key1=foo&key2=bar... is definitely the way to go.
If you don't mind dropping the key names, you can use
http://example.com?url[]=1&url[]=2&url[]=3
EDIT Keeping the key names:
http://example.com?values[]=1&values[]=2&values[]=3&keys[]=1&keys[]=2&keys[]=3
Then in your PHP script:
$url = array_combine($_GET['keys'], $_GET['values']);
Could you solve your problem by saving the data as a HTML cookie? That way you don't have to modify the URL at all.
If you know the values in advance, you can set them from the server side when you send the user the page with your target link on it.
If you won't know the values until the user fills out a form it can still be done using JavascriptL When the user clicks the form submit you can set multiple cookies by making multiple javascript calls like:
document.cookie = 'key1=test; expires=Mon, 7 Sept 2009 23:47:11 UTC; path=/'
The security model might give you some trouble if you are trying to pass this data from one domain to another though.