I have an object defined in a .js file, which is done via PHP on the server side.
I would like to know how to set a variable equal to this object, because the JS file doesn't actually define anything, it is just the object...
EX: (this is my .js file on my server)
{
"Title": {"Link" = "http://example.com", "img" = "http://imgurl.com"},
"Title2": {"Link" = "http://blahblah.com", "img" = "http://imgurl.com"}
}
This is what we call a JSON file. You can parse it with JSON.parse.
As for how to get the content of the file dynamically, you could use the JQuery function getJSON or work the AJAX yourself, but I don't know a lot about that.
Related
How can I create a function that loops through a folder in my directory called "data." It contains only image files, and I will keep adding more image files to it. Previously, I was using the following function that returns an array of URLs:
function _image_urls(){return(
[
"https://images.pexels.com/photos/4050284/pexels-photo-4050284.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1",
"https://images.pexels.com/photos/1323550/pexels-photo-1323550.jpeg?auto=compress&cs=tinysrgb&w=600",
"https://images.pexels.com/photos/2002719/pexels-photo-2002719.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1",
"https://images.pexels.com/photos/919606/pexels-photo-919606.jpeg?auto=compress&cs=tinysrgb&w=600",
"https://images.pexels.com/photos/1983038/pexels-photo-1983038.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1",
"https://images.pexels.com/photos/1702624/pexels-photo-1702624.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1",
"https://images.pexels.com/photos/3631430/pexels-photo-3631430.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1",
"https://images.pexels.com/photos/5011647/pexels-photo-5011647.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1",
"https://images.pexels.com/photos/135018/pexels-photo-135018.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1",
"https://images.pexels.com/photos/161154/stained-glass-spiral-circle-pattern-161154.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1"
]
)}
I'm trying to create a function that returns an array of paths for all the images in the data folder. I have been trying the following approach:
function _image_urls(){
const image_folder = 'data';
const image_extension = '.jpg';
let image_urls = [];
for (let i = 0; i < 10; i++) {
let image_url = image_folder + i + image_extension;
image_urls.push(image_url);
}
return image_urls;
}
It seems like this will just return an array like:
[
"data0.jpg",
"data1.jpg",
"data2.jpg",
"data3.jpg",
"data4.jpg",
"data5.jpg",
"data6.jpg",
"data7.jpg",
"data8.jpg",
"data9.jpg"
]
If that's what you're getting, then you need to use i as the index for an array that contains the file names.
The bigger question is how are you getting that list of files in the first place? This is generally not something that JavaScript can do on its own. If the files exist on the server, you'd need some server-side script to actually access the folder and output the array of file names - this can then be put into an array several ways (either writing it directly to the code if you allow your server side code to process the JS file or probably more likely using an XHR to request the file names and then populate the array when you get the response.)
If you write this server side script such that it formats the output as JSON, then it could simply be a matter of using JSON.parse() to convert the output to an array directly without any need to iterate over the response such as the function in the question.
EDIT/UPDATE after comment from OP:
Since you're using PHP on the server side, I would create a server side script that readers the contents of the "Data" folder and outputs a JSON formatted string which can then be parsed by the JS on the front end.
In general, this is done using the scandir function. See https://www.php.net/manual/en/function.scandir.php for details.
and the steps would be as follows:
Use scandir to get an array of files in the Data folder
Remove the first two items in the array (. and ..)
Use the json_encode function to convert the array to a JSON formatted string
Echo that string
Then on the page where you have your JS you have two options:
Include the PHP script described above such that it becomes a JS array using JSON.parse().
Use an XHR to request the PHP script, and when you get a response use JSON.parse() to set it as an array variable.
The first method is outdated, but very simple - though it does require that your JS code is parsed by PHP which may or may not be possible/advisable depending on your server configuration.
The second method is probably what you should do, as long as you're fine with the array being populated after the page loads and that you wait for the XHR to complete before calling any functions that rely on the array.
The main thing to know here is that what you want to do is not possible using only JavaScript because JS cannot read the contents of a folder on the server. Your JS will need to interact with some server side code in order to read the contents of a folder into any array.
I am using the karate api framework to automate web services.
Currently, I am facing problem to set the response value back to the .js or JSON file which I receive from the cucumber feature file.
My response:{"authorizationtoken" : "58102a8c9e074d578edae8f3d5e96001'}
How can I save this to .js or JSON file to reuse them in other scripts [feature files] ?
Thanks in advance.
You cannot save the value to a .js or JSON file provided you don't want to write the value to a json file
You can assign the value to a variable , let say using a namespacing technique to avoid collision
var nameSpaceObject = {
authKey : "",
someOtherFunctionIfNecessary :function(){}
};
Then you can call this name space & assign value to it
var response = {"authorizationtoken" : "58102a8c9e074d578edae8f3d5e96001' }
nameSpaceObject.authKey = response.authorizationtoken;
I have json file with given data (total.json)
var data = {"trololo":{"info":"61511","path".... }}
I need to get object "info" and then print data "61511" in alert window
I include my json like
var FILE = 'total'
var data_file_names = {};
data_file_names[FILE] = 'total.json';
And then i use it like
var data_trololo = data_file_names[FILE];
Plese, help me print object "info". Maybe there is another way to solve this problem
You need to make an ajax call to the json file. Then you can access the array like the below example.
Note : Your json wasn't properly formatted.
var data = {
"trololo":{
"info": ["61511","path"]
}
};
console.log(data.trololo.info[0]); //this one will print 61511
Usually one can make an ajax call to read the file on the server.
But if you are ok with using HTML5 features then go through the link find out how to read the file on the browser itself. Though File API being part of HTML5 spec is stable across browsers.
http://www.html5rocks.com/en/tutorials/file/dndfiles/
I have a subject.js javascript file in which json data is stored:
Subject.js
Example:
Teacher = {
"Eng" : "English",
"Math" : "Maths",
"Sci" : "Science",
"SST" : "Social Studies",
"Hin" : "Hindi"
};
I want to read json data from this js file into another js file.
But I learnt that $.getJSON('filename.json', function(data) { is used to get data from json file but my json data is stored in js file. Can anyone tell me how to get started? I tried using getJson but can't get it to work.
There are two possibilities:
The file can just be included and use the teacher variable as if you ran the getJSON function.
The Teacher = and semi-colon at the end can be removed (verify it is a correct JSON structure) and save the file as .json. Assuming your server will send a JSON file, this should allow the file to be requested.
Remove the varibale declaration "Teacher =" and your js become a json content that can be called by $.getJSON
You simply need to include the file with your Teacher definition on the same page as your other JS file. Then you will have access to the variables defined in Subject.js. For instance:
<script src="Subject.js"></script>
<script>
console.log(Teacher.Sci)
</script>
would output Science to the javascript console.
JSON is not its own type in Javascript, it is simply a certain syntax for defining plain-old Javascript objects. JSON stands for JavaScript Object Notation. This is the JSON part of your example:
{
"Eng" : "English",
"Math" : "Maths",
"Sci" : "Science",
"SST" : "Social Studies",
"Hin" : "Hindi"
}
So when you set a variable equal to a JSON block as in your example, you are creating an object with those properties. As such, you can simply treat that JSON object like any other javascript object. The code you provided is the same as the following:
Teacher = new Object();
Teacher.Eng = "English";
Teacher.Math = "Maths";
Teacher.Sci = "Science";
Teacher.SST = "Social Studies";
Teacher.Hin = "Hindi";
$.getJSON, on the other hand, is used for converting a text file (or file output) in JSON notation into a javascript object, but that is not necessary in this case, as your JSON object is already created within the javascript code.
Here's something I want to learn and do. I have a JSON file that contains my product and details (size, color, description). In the website I can't use PHP and MySQL, I can only use Javascript and HTML. Now what I want to happen is using JQuery I can read and write a JSON file (JSON file will serve as my database). I am not sure if it can be done using only JQuery and JSON.
First thing, How to query a JSON file? (Example: I would search for the name and color of the product.)
How to parse the JSON datas that were searched into an HTML?
How to add details, product to the JSON file?
It will also be great if you can point me to a good tutorial about my questions.
I'm new to both JQuery and JSON.
Thanks!
Since Javascript is client side, you won't be able to write to the JSON file on the server using only Javascript. You would need some server side code in order to do that.
Reading and parsing the JSON file is not a problem though. You would use the jQuery.getJSON function. You would supply both a url and a callback parameter (data isn't needed, because you're reading a file, so no need to send data). The url would be the path to your JSON file, and the callback would be a function that uses the data.
Here's an example of what your code might look like. I don't know exactly what your JSON is, but if you have a set called "products" containing a set of objects with the details "name" and "price", this code would print those out:
$.getJSON("getProductJSON.htm",
function(data) {
$.each(data.products, function(i, item) {
var name = item.name;
var price = item.price;
// now display the name and price on the page here!
});
},
);
Basically, the data variable in $.getJSON makes the entire contents of the JSON available to you, very easily. And the $.each is used to loop over a set of JSON objects.