js, make a json object a string - the easy way? - javascript

I have tried lots of different ways, and using many diffent PHP and JS functions to try to achieve this.
Hoe to i turn this json object ;
"lines" : ["text line 1<br/>","text line 2<br/>","text line 3<br/>","text line 4<br/>"]
Into this string, so that i can add to a HTMl div
text line 1<br/> text line 2<br/> text line 3<br/> text line 4<br/>
No, quotes, brackets or anything else.
In it's simplest form all i have is stringify;
lines = JSON.stringify(obj.lines)
but the above outputs, brackets, quotes, and commas
Sorry if this is a simple and silly question, but i h (finishing now (embarrassed!)) ave searched everywhere for a simple answers. Nothing stands out.


Check out Array.join:
var html = obj.lines.join("");
Example: http://jsfiddle.net/VXbs7/


You have a JSON string. You need to parse it into a data structure, then get the array of strings, and loop over them (outputting as you go).


If you're doing this from javascript, it's quite easy. JSON is native to javascript and can be interpreted as an object quite simply. It looks like you only have half your JSON object pasted in your question though. A whole JSON object is wrapped in [] or {} (unless it's just a string or number type, but then it's not an object).
Anyway, if you're in PHP - you can easily json_decode() this string and loop it like so:
<?php
$arr = json_decode($json_string, true); //true makes it an array instead of object
foreach ($arr['lines'] as $line)
{
echo $line;
}
If you're trying to accomplish it in javascript (in the browser), it's also quite easy (assuming your string is stored in a php variable, and that you're using jquery for dom manipulation)
<script type="text/javascript">
var obj = <?= $json_string; ?>,
mydiv = $('#mydiv);
for (key in obj['lines'])
{
var line = obj['lines'][key];
mydiv.append(line);
}
</script>
both of those should give you the output you're looking for

Related

Converting href perl variables to normal scalar variables

I have these two variables that I am trying to compare. They both have the same value, however, one is a href variable - meaning, it's being read from a file like this
<a href=http://google.com>Variable</a>
It's read like this, but displayed as an anchor tag in the browser, so when I go to compare a value using print "$collect_zids{$key} --> $temp";I see in the browser as
Variable --> Variable
How it appears in the browser. One text another link.
I'm assuming these two values are different hence why this code does not run
if($collect_zids{$key} eq $from_picture){
print "<h1>Hello</h1>";
}
Is there a way I can convert the href variable into a normal scalar variable so that I can compare them?
Thanks!
P.S. I think Javascript might be the only way, however, I don't have any experience with it.

There is no such thing as an "href variable". You have two scalar variables. One contains plain text and the other contains HTML. Your task is to extract the text inside the HTML <a> tag from the HTML variable and to compare that text with the text from the plain text variable.
One way to do that would be to remove the HTML from the HTML variable.
my $html = '<a href=http://google.com>Variable</a>';
my $text = 'Variable';
$html =~ s/<.+?>//g;
if ($html eq $text) {
say "Equal";
} else {
say "Not Equal [$html/$text]";
}
But it cannot be emphasised enough that parsing HTML using a regular expression is very fragile and is guaranteed not to work in many cases. Far better to use a real HTML parser. HTML::Strip is made for this very purpose.
#!/usr/bin/perl
use strict;
use warnings;
use feature 'say';
use HTML::Strip;
my $html = '<a href=http://google.com>Variable</a>';
my $text = 'Variable';
my $parser = HTML::Strip->new;
$html = $parser->parse($html);
if ($html eq $text) {
say "Equal";
} else {
say "Not Equal [$html/$text]";
}
It's also worth pointing out that this is answered in the Perl FAQ
How do I remove HTML from a string?
Use HTML::Strip, or HTML::FormatText which not only removes HTML but
also attempts to do a little simple formatting of the resulting plain
text.
Update: In a comment, you say
I have no way of using these methods since I am not explicitly defining the variable.
Which is clearly not true. How a variable is initialised has no bearing whatsoever on how you can use it.
I assume your HTML text is in the variable $from_picture, so you would strip the HTML with code like this:
my $parser = HTML::Strip->new;
my $stripped = $parser->parse($from_picture);
if($collect_zids{$key} eq $stripped){
print "<h1>Hello</h1>";
}
I have no idea where you got the idea that you couldn't use my solution because I was directly initialising the variables, where you were reading the data from a file. An important skill in programming is the ability to see through complex situations and extract the relevant details. It appears you need to do some more work in this area :-)

I found the answer using the Perl module HTML::FormatText;
use HTML::FormatText;
my $formatter = HTML::FormatText->new();
my $string = HTML::FormatText->format_file("path_to_the_file"); #$string variable to hold the result and the path must be for a file.
After using the HTML::FormatText module, I was able to get the raw string that was being read, instead of it being interpreted as HTML. So, I was getting <a href=http://google.com>Variable</a> returned, instead of just Variable. After getting the raw string, I could use regex to extract the parts that I needed.
Credit to - https://metacpan.org/pod/HTML::FormatText

Generate JSON array

I want to generate a JSON array with PHP, but it doesn't work well.
My PHP array looks like this:
protected $resultArray = array("1.0" => 0, "1.3" => 0);
then I do this:
return json_encode($resultArray);
but then i've got this:
var array = [{"1.0":2,"1.3":1}];
Why is " replaced with "?

quot; is a quote character (") encoded as HMTL. json_encode() does not produce HTML encoded sequences.
Replace return with echo in return json_encode($resultArray); and you'll see this for yourself.
Most probably the returned string is passed further to a function that runs it through htmlspecialchars() or htmlentities() and this is the correct way to work with it if you put it into an HMTL context.
Use a different viewer class if you need to output only the json_encode()-ed string. I don't know TYPO3 but I guess you should use JsonView; pass it $resultArray as-is and it will call json_encode() for you.

I think you may using etended library for example in wamp server I tested this code and it's work fine
$str = "<div style='position:relative'><img src='/assets/ui/success.png' /><span
style='position:relative;top:-15px;'>Nachricht empfangen!</span></div>";
echo json_encode(array('prompt' => $str));
//output
//{"prompt":"<div style='position:relative'><img src='\/assets\/ui\/success.png' \/><span style='position:relative;top:-15px;'>Nachricht empfangen!<\/span><\/div>"}

Thanks guys for help!
The solution is (only for typo3). To get a properly correct JSON-Array in the view the JS code has to be improved the following way:
var array = {f:format.htmlentitiesDecode(value:chartarray)};

Having trouble making JSON parse and eval to work in JavaScript

As I stated above, I have a PHP script and a JavaScript, I have a few objects that read text files on the server side and then pass the data to the JavaScript.
Here's my entire code:
map.html: http://www.pastebin.com/b45mbvgp and index.php: http://www.pastebin.com/zibdquzu
The part that really matters:
var x = <?php echo json_encode($streetsObject); ?>;
var obj = eval("("x")");
I've also tried
var obj = JSON.parse(x);
the X variable does get set to the size of the passed object, 527 (tested it) but when I try to use the eval or JSON parse function is simply doesn't work. Do I have some sort of mistake in my html code which is messing with my calls to other libraries? If so that would be weird because kinetic.js is working just fine. I've been googling examples of JSON and I have yet to see an example of parsing a passed object, it's all examples of local objects :(
(Code works fine if I remove eval / json line of code)

Simply do:
var obj = <?php echo json_encode($streetsObject); ?>;
JSON means JavaScript Object Notation. If you insert JSON directly to Javascript, it will run fine, just in this case. No parsing needed. eval is not recommended to use for JSON parsing, but the same applies to that (note that eval actually works because JSON is valid Javascript!).
JSON.parse is only needed if you have JSON in a Javascript string. So this would work:
var str = '<?php echo json_encode($streetsObject); ?>';
var obj = JSON.parse(str);

Create 2d array from string

I have the following string :
[[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,],]
How can I create a 2d array of strings from it ?
EDIT
I've removed html tags since they're not the problem here. Also I'd like to do it without using any additional libs to keep it lightweight.

Except from the HTML tags in it, it would be valid JSON. You could remove the HTML tags and parse it using any library that handles JSON, like jQuery:
var arr = $.parseJSON(theString.replace(/<br\/>/g,''));
It would also be valid Javascript code with the HTML tags removed, so if you have full control over where the string comes from so that you are certain that it can never contain any harmful code, you could use the eval function to execute the string:
// Warning: 'eval' is subject to code injection vulnerabilities
var arr = eval(theString.replace(/<br\/>/g,''));

You will need to remove the <br/> from the string. Then you should be able to do:
var my2darray = eval(mystring);

Is JSON.parse supposed to be recursive?

I am parsing a json string like so:
ring = JSON.parse(response);
Now, ring is an object but ring.stones is just a string when it should be an object as well.
If I call:
ring.stones = JSON.parse(ring.stones);
It is now the correct object.
I didn't know if this is correct behavior or if maybe I have an issue somewhere stopping it from parsing recursively? If it is supposed to parse recursively, are there any known issues that would prevent it?
Update
Here is the full response before parsing:
{"ring_id":"9","stone_count":"4","style_number":"style 4","syn10":"436.15","gen10":"489.39","syn14":"627.60","gen14":"680.85","available":"yes","type":"ring","engravings_count":"0","engravings_char_count":"0","engravings_band":"10","stones":"[{\"stone_id\":\"27\",\"ring_id\":\"9\",\"stone_shape\":\"round\",\"stone_x\":\"132.80\",\"stone_y\":\"114.50\",\"stone_width\":\"71.60\",\"stone_height\":\"71.60\",\"stone_rotation\":\"0.00\",\"stone_number\":\"1\",\"stone_mm_width\":\"5.00\",\"stone_mm_height\":\"5.00\"},{\"stone_id\":\"28\",\"ring_id\":\"9\",\"stone_shape\":\"round\",\"stone_x\":\"100.50\",\"stone_y\":\"166.20\",\"stone_width\":\"36.20\",\"stone_height\":\"36.60\",\"stone_rotation\":\"0.00\",\"stone_number\":\"2\",\"stone_mm_width\":\"2.50\",\"stone_mm_height\":\"2.50\"},{\"stone_id\":\"29\",\"ring_id\":\"9\",\"stone_shape\":\"round\",\"stone_x\":\"200.20\",\"stone_y\":\"105.10\",\"stone_width\":\"33.90\",\"stone_height\":\"33.90\",\"stone_rotation\":\"0.00\",\"stone_number\":\"3\",\"stone_mm_width\":\"2.50\",\"stone_mm_height\":\"2.50\"},{\"stone_id\":\"30\",\"ring_id\":\"9\",\"stone_shape\":\"round\",\"stone_x\":\"165.80\",\"stone_y\":\"82.50\",\"stone_width\":\"35.50\",\"stone_height\":\"33.90\",\"stone_rotation\":\"0.00\",\"stone_number\":\"4\",\"stone_mm_width\":\"2.50\",\"stone_mm_height\":\"2.50\"}]","images":"[{\"title\":\"white gold\",\"source\":\"Style4_4_W_M.png\"},{\"title\":\"yellow gold\",\"source\":\"Style4_4_Y_M.png\"}]"}
Update 2
Based on mikerobi's answer I was able to figure out what was happening:
Here is where I encoded it:
$row = $sth->fetch(PDO::FETCH_ASSOC);
$row['stones'] = getStones($ring_id);
$row['images'] = getRingVariations($ring_id);
return json_encode($row);
But the functions getStones and getRingVariations were returning json_encode'd strings. I needed to change them to return plain strings.

Your JSON structure is wrong, it is wrapping stones in quotes, turning it into a string.
Your JSON looks like:
{
stones: "[{\"stone_id":\"27\"},{\"stone_id\":\"27\"}]"
}
It should look like:
{
stones: [{"stone_id": 27},{"stone_id": 27}]
}
EDIT
It appears you are converting all values to string, including numbers, I updated my example to reflect this.
Also, I'm guessing by the output that you are writing your own code to serialize the JSON, I highly recommend using an existing library.

It is recursive, but your input string (response) is not in correct format. Get rid of those escape characters (\") and try again.

Categories