I get an array of numbers as a response from remote command execution (using ssh2). How do I convert it to a string?
[97,112,112,46,106,115,10,110,111,100,101,46,106,115,10]
var result = String.fromCharCode.apply(null, arrayOfValues);
JSFiddle
Explanations:
String.fromCharCode can take a list of char codes as argument, each char code as a separate argument (for example: String.fromCharCode(97,98,99)).
apply allows to call a function with a custom this, and arguments provided as an array (in contrary to call which take arguments as is). So, as we don't care what this is, we set it to null (but anything could work).
In conclusion, String.fromCharCode.apply(null, [97,98,99]) is equivalent to String.fromCharCode(97,98,99) and returns 'abc', which is what we expect.
It depends on what you want and what you mean.
Option One: If you want to convert the text to ASCII, do this:
var theArray = [97,112,112,46,106,115,10,110,111,100,101,46,106,115,10];
theString = String.fromCharCode.apply(0, theArray);
(Edited based on helpful comments.)
Produces:
app.js
node.js
Option Two: If you just want a list separated by commas, you can do .join(','):
var theArray = [97,112,112,46,106,115,10,110,111,100,101,46,106,115,10];
var theString = theArray.join(',');
You can put whatever you want as a separator in .join(), like a comma and a space, hyphens, or even words.
In node.js it's usually done with buffers:
> new Buffer([97,112,112,46,106,115,10,110,111,100,101,46,106,115,10]).toString()
'app.js\nnode.js\n'
It'll be faster than fromCharCode, and what's most important, it'll preserve utf-8 sequences correctly.
just use the toString() function:
var yourArray = [97,112,112,46,106,115,10,110,111,100,101,46,106,115,10];
var strng = yourArray.toString();
The ssh2 module passes a Buffer (not an actual javascript array) to 'data' event handlers for streams you get from exec() or shell(). Unless of course you called setEncoding() on the stream, in which case you'd get a string with the encoding you specified.
If you want the string representation instead of the raw binary data, then call chunk.toString() for example.
Related
In my app a user submits text through a form's textarea and this text is passed on to the app and is then processed by jsesc library, which escapes javascript strings.
The problem is that when I type in a text in Russian, such as
нам #интересны наши #идеи
what i get is
'\u043D\u0430\u043C #\u0438\u043D\u0442\u0435\u0440\u0435\u0441\u043D\u044B \u043D\u0430\u0448\u0438 #\u0438\u0434\u0435\u0438'
I then need to pass this data through FlowDock to extract hashtags and FlockDock just does not recognize it.
Can someone please tell me
1) What is the need for converting it into that representation;
2) If it makes sense to convert it back to cyrillic encoding for FlowDock and for the database, or shall I keep it in Unicode and try to make FlowDock work with it?
Thanks!
UPDATE
The complete script is:
result = getField(req, field);
result = S(result).trim().collapseWhitespace().s;
// at this point result = "нам #интересны наши #идеи"
result = jsesc(result, {
'quotes': 'double'
});
// now i end up with Unicode as above above (\u....)
var hashtags = FlowdockText.extractHashtags(result);
FlowDock receives the result which is
\u043D\u0430\u043C #\u0438\u043D\u0442\u0435\u0440\u0435\u0441\u043D\u044B \u043D\u0430\u0448\u0438 #\u0438\u0434\u0435\u0438
And doesn't extract hashtags from it...
These are 2 representations of the same string:
'нам #интересны наши #идеи' === '\u043D\u0430\u043C #\u0438\u043D\u0442\u0435\u0440\u0435\u0441\u043D\u044B \u043D\u0430\u0448\u0438 #\u0438\u0434\u0435\u0438'
looks like flowdock-text doesn't work well with non-ASCII characters
UPD: Tried, actually works well:
fdt.extractHashtags('\u043D\u0430\u043C #\u0438\u043D\u0442\u0435\u0440\u0435\u0441\u043D\u044B \u043D\u0430\u0448\u0438 #\u0438\u0434\u0435\u0438');
You shouldn't have used escaping in the first place, it gives you string literal representation (suits for eval, etc), not a string.
UPD2: I've reduced you code to the following:
var jsesc = require('jsesc');
var fdt = require('flowdock-text');
var result = 'нам #интересны наши #идеи';
result = jsesc(result, {
'quotes': 'double'
});
var hashtags = fdt.extractHashtags(result);
console.log(hashtags);
As I said, the problem is with jsesc: you don't need it. It returns javascript-encoded string. You need when you are doing eval with concatenation to protect from code injection, or something like this. For example if you add result = eval('"' + result + '"');, it will work.
What is the need for converting it into that representation?
jsesc is a JavaScript library for escaping JavaScript strings while generating the shortest possible valid ASCII-only output. Here’s an online demo.
This can be used to avoid mojibake and other encoding issues, or even to avoid errors when passing JSON-formatted data (which may contain U+2028 LINE SEPARATOR, U+2029 PARAGRAPH SEPARATOR, or lone surrogates) to a JavaScript parser or an UTF-8 encoder, respectively.
Sounds like in this case you don’t intend to use jsesc at all.
Try this:
decodeURIComponent("\u043D\u0430\u043C #\u0438\u043D\u0442\u0435\u0440\u0435\u0441\u043D\u044B \u043D\u0430\u0448\u0438 #\u0438\u0434\u0435\u0438");
Thanks for looking!
BACKGROUND
I am writing some front-end code that consumes a JSON service which is returning malformed JSON. Specifically, the keys are not surrounded with quotes:
{foo: "bar"}
I have NO CONTROL over the service, so I am correcting this like so:
var scrubbedJson = dirtyJson.replace(/(['"])?([a-zA-Z0-9_]+)(['"])?:/g, '"$2": ');
This gives me well formed JSON:
{"foo": "bar"}
Problem
However, when I call JSON.parse(scrubbedJson), I still get an error. I suspect it may be because the entire JSON string is surrounded in double quotes but I am not sure.
UPDATE
This has been solved--the above code works fine. I had a rogue single quote in the body of the JSON that was returned. I got that out of there and everything now parses. Thanks.
Any help would be appreciated.
You can avoid using a regexp altogether and still output a JavaScript object from a malformed JSON string (keys without quotes, single quotes, etc), using this simple trick:
var jsonify = (function(div){
return function(json){
div.setAttribute('onclick', 'this.__json__ = ' + json);
div.click();
return div.__json__;
}
})(document.createElement('div'));
// Let's say you had a string like '{ one: 1 }' (malformed, a key without quotes)
// jsonify('{ one: 1 }') will output a good ol' JS object ;)
Here's a demo: http://codepen.io/csuwldcat/pen/dfzsu (open your console)
something like this may help to repair the json ..
$str='{foo:"bar"}';
echo preg_replace('/({)([a-zA-Z0-9]+)(:)/','$1"$2"${3}',$str);
Output:
{"foo":"bar"}
EDIT:
var str='{foo:"bar"}';
str.replace(/({)([a-zA-Z0-9]+)(:)/,'$1"$2"$3')
There is a project that takes care of all kinds of invalid cases in JSON https://github.com/freethenation/durable-json-lint
I was trying to solve the same problem using a regEx in Javascript. I have an app written for Node.js to parse incoming JSON, but wanted a "relaxed" version of the parser (see following comments), since it is inconvenient to put quotes around every key (name). Here is my solution:
var objKeysRegex = /({|,)(?:\s*)(?:')?([A-Za-z_$\.][A-Za-z0-9_ \-\.$]*)(?:')?(?:\s*):/g;// look for object names
var newQuotedKeysString = originalString.replace(objKeysRegex, "$1\"$2\":");// all object names should be double quoted
var newObject = JSON.parse(newQuotedKeysString);
Here's a breakdown of the regEx:
({|,) looks for the beginning of the object, a { for flat objects or , for embedded objects.
(?:\s*) finds but does not remember white space
(?:')? finds but does not remember a single quote (to be replaced by a double quote later). There will be either zero or one of these.
([A-Za-z_$\.][A-Za-z0-9_ \-\.$]*) is the name (or key). Starts with any letter, underscore, $, or dot, followed by zero or more alpha-numeric characters or underscores or dashes or dots or $.
the last character : is what delimits the name of the object from the value.
Now we can use replace() with some dressing to get our newly quoted keys:
originalString.replace(objKeysRegex, "$1\"$2\":")
where the $1 is either { or , depending on whether the object was embedded in another object. \" adds a double quote. $2 is the name. \" another double quote. and finally : finishes it off.
Test it out with
{keyOne: "value1", $keyTwo: "value 2", key-3:{key4:18.34}}
output:
{"keyOne": "value1","$keyTwo": "value 2","key-3":{"key4":18.34}}
Some comments:
I have not tested this method for speed, but from what I gather by reading some of these entries is that using a regex is faster than eval()
For my application, I'm limiting the characters that names are allowed to have with ([A-Za-z_$\.][A-Za-z0-9_ \-\.$]*) for my 'relaxed' version JSON parser. If you wanted to allow more characters in names (you can do that and still be valid), you could instead use ([^'":]+) to mean anything other than double or single quotes or a colon. You can have all sorts of stuff in here with this expression, so be careful.
One shortcoming is that this method actually changes the original incoming data (but I think that's what you wanted?). You could program around that to mitigate this issue - depends on your needs and resources available.
Hope this helps.
-John L.
How about?
function fixJson(json) {
var tempString, tempJson, output;
tempString = JSON.stringify(json);
tempJson = JSON.parse(tempString);
output = JSON.stringify(tempJson);
return output;
}
I'm having an issue with a javascript call to an api function in NetSuite that returns a string with quotes in it. An error is thrown each time the call is made.
var selling_point_1 = "<%=getCurrentAttribute('item','custitemsellingpoint1')%>";
when looking in the debugger, this evaluates to:
var selling_point_1 = "Product Dimensions: H:14" W:24"";
Any string function (like .length or charAt(0) ) on this also throws an error. I have no control over what the function call returns, so i need to know how to handle embedded quotes.
Any help would be greatly appreciated, John
Although not the most robust method you could use:
var selling_point_1 = escape("<%=getCurrentAttribute('item','custitemsellingpoint1')%>");
This is actually for URI escaping, but will get rid of the pesky double quotes, plus you can use unescape to get the original format back. As suggested
var selling_point_1 = '<%=getCurrentAttribute(\'item\',\'custitemsellingpoint1\')%>';
Should also work in your case.
See this thread for someone dealing with roughly the same issue. The short answer is that you need to run some kind of escape function in the server-side code (i.e., within the <%=...%> block) so that only escaped values get inserted into the client-side code. All of the solutions below can handle an unlimited number of single and double quotes.
My first suggestion is to try:
var selling_point_1 = decodeURI("<%=Server.URLEncode(getCurrentAttribute('item','custitemsellingpoint1'))%>");
This will produce server-side JS that looks like:
var selling_point_1 = decodeURI("Product Dimensions: H:14%22 W:24%22");
The decodeURI JavaScript function will convert the %22 back into quotes and the correct string will be stored in selling_point_1.
If that fails, you might also try something like:
var selling_point_1 = unescape("<%=HttpServerUtility.HtmlEncode(getCurrentAttribute('item','custitemsellingpoint1'))%>");
which operates similarly, but tuuns your quotes into \" sequences, which will be converted back into ordinary quotes by JavaScript's unescape.
I have a string formatted like this:
item_questions_attributes_abc123_id
I'm specifically trying to get the abc123 bit. That string can be any alphanumeric of any case. No special characters or spaces.
I'm using jQuery, though I'm certainly fine with using straight javascript if that's the best solution.
If it's always the 4th part of the string you can use split.
var original = 'item_questions_attributes_abc123_id';
var result = original.split('_')[3];
Try this:
var myArray = myString.split("_");
alert(myArray[3]);
use split method of javascript and then use 2nd last index you will have your required data.
In PHP, it's pretty simple, I'd assume, array_shift($string)?
If not, I'm sure there's some equally simple solution :)
However, is there any way to achieve the same thing in JavaScript?
My specific example is the pulling of window.location.hash from the address bar in order to dynamically load a specific AJAX page. If the hash was "2", i.e. http://foo.bar.com#2...
var hash = window.location.hash; // hash would be "#2"
I'd ideally like to take the # off, so a simple 2 gets fed into the function.
Thanks!
hash = hash.substr(1);
This will take off the first character of hash and return everything else. This is actually similar in functionality to the PHP substr function, which is probably what you should be using to get substrings of strings in PHP rather than array_shift anyway (I didn't even know array_shift would work with strings!)
As you suspected, there's also a shift() function on the Array prototype (MDN).
Strings are not Arrays, they are "array-like objects" so to call shift() on a String, it must be split() first:
var arr = str.split("");
var char = arr.shift();
var originalString = arr.join("");
Building on Ben's point regarding conversion to an Array, given that we are assuming there is only one character as the hash, and that it is the last character, we should really just use:
var hash = window.location.split("").pop();