Json not defined javascript

Javascript - fetch not defined in Safari (ReferenceError, I am using react with redux and here is some example code: export function fetchData (url) < return dispatch =>< dispatch (loading ()) fetch (url, < method: 'GET' >) .then (response => < response.json () .then (data =>< dispatch (success (data)) >) >) > > javascript safari fetch-api Share Improve this question

Using JQuery getJSON with other JavaScripts included gives ReferenceError

It certainly sounds as if some of the additional code you have brought in has undefined the $ symbol. In fact, it is possible you have included some code that calls jQuery's noConflict function, which specifically undefines $.

jQuery, in essence, defines it like this:

That means that you could replace the $ symbol in your code with "jQuery," for example:

Of course, the $ symbol shortcut certainly is handy. It would be a shame to give that up, so you could redefine it to stand in for "jQuery" once again. You would not want it to break any of your other, non-jQuery JavaScript, though, so the safe way to reestablish the $ shortcut would be to wrap all of your own code in closures. The lone parameter to each closure function would be "$" and the argument passed to each closure would "jQuery." For example:

Notice that the anonymous function closure has the parameter $, so inside the entire function the $ will have the value you pass to the anonymous function. Next, notice that at the end of the function definition, we immediately invoke the function we have just defined and we pass jQuery as the argument. That means that inside the closure, but only inside the closure, $ is now a shortcut for jQuery.

One final note, you can deliberately turn off jQuery's use of the $ symbol by calling jQuery.noConflict() (see http://api.jquery.com/jQuery.noConflict/). If you will be using other JavaScript code beyond just your code and jQuery, it is a good idea to call that function after you have loaded all of your JavaScript files, then use the closure technique described above, so that you can safely continue to the $ shortcut in your own code.

$ is not defined means that jQuery is not linked to the $ variable at the point of the error. This could be for one of two reasons:

1. jQuery used to be set as the $ variable, but no longer is. You may have called jQuery.noConflict(), for instance.
2. You have not yet defined jQuery. This may be because you have placed this script above the call to the jQuery library. Make sure that the first script you reference is the jQuery source.

You have a conflict with the $ variable as mootools is also attempting to use the variable. Only 1 can use it at a time.

Check out jQuery.noConflict() -> http://api.jquery.com/jquery.noconflict/

You need to call no conflict before any attempt to use jQuery is made. You have a few optons with using jQuery.noConflict(). One is to just reassign and use a jQuery specific variable everywhere:

When dealing with a separate JS file you can use a litte JS functionality to allow the '$' variable to mean "jQuery" within your file:

That little beauty is called a self-invoking anonymous function. We are defining the $ as an input parameter, but passing in jQuery to ensure that is what the $ variable means.

Javascript - Catch a referenceError in js, I have a textarea where user can enter javascript code which upon press of the button would be passed to eval (). I am having trouble catching the referenceError for cases when a user enters something like this: var myName = Maria; instead of var myName = "Maria"; Thank you for you time! javascript …

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Cannot fetch JSON data using GET method: resJSON is not defined error

error happens in this line: .then((data) => (resJSON = data)) The wierd thing is that I see in the backend that the json is created. Also I'm using very similar fetch request for POST data on another endpoint without any issues. So I'm wondering what could be wrong here?

When I use .then((data) => (users = data)) directly, I get an [object Object] instead of the resulting json.

I get an [object Object] instead of the resulting json , the line res.json() parses the json and returns a Promise that fulfills with that parsed result (or rejects in case of a parsing error). In the shown code there is nothing that would emit [object Object] , but if data is an object then the request to /users returns an as json encoded object.

@T.J.Crowder It is a much cleaner way and resolves the problem. Thanks for the tip. I really got lost in the .then( jungle.

2 Answers 2

The problem is that resJSON = data is assigning to an identifier that isn't declared anywhere. Apparently your code is running in strict mode (good!), so assigning to an undeclared identifier is an error.

But there's no need for resJSON , it doesn't do anything useful in that code. You could combine the two then handlers and do users = data . But, that's generally poor practice, because you're setting yourself up for this problem where you try to use users before it's filled in. (Your code is also falling prey to the fetch API footgun I describe in this post on my anemic old blog: You need to check ok before you call json() .)

But fundamentally, having fetchUsers directly assign to a users variable declared outside of it is asking for trouble. Instead, have fetchUsers return a promise of the users array. Here in 2022 you can do that with an async function:

const fetchUsers = async () => < const response = await fetch(baseUrl + "/users/", < method: "GET", >); if (!response.ok) < throw new Error(`HTTP error $`); > return await response.json(); >; 

(If you want to hide errors from the calling code (which is poor practice), wrap it in a try / catch and return an empty array from the catch .)

Then have the code that needs to fill in users do let users = await fetchUser(); (note that that code will also need to be in a async function, or at the top level of a module).

If for some reason you can't use an async function, you can do it the old way:

const fetchUsers = () => < return fetch(baseUrl + "/users/", < method: "GET", >) .then(response => < if (!response.ok) < throw new Error(`HTTP error $`); > return response.json(); >); >; 

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AliasIO / Raphael.JSON Public archive

ReferenceError: json is not defined #16

ReferenceError: json is not defined #16

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I've setup a simple sample page. The Json object is created but when i try and load it back i get

ReferenceError: json is not defined

The text was updated successfully, but these errors were encountered:

On 12 Jan 2013, at 00:14, Elbert Alias wrote:

If you use var inside a function that variable will only be available in the scope of that function. If you define it outside the function it will work:

$('#clickhere').click(function() var json = paper.toJSON();
var json;

$('#clickhere').click(function() json = paper.toJSON();
—
Reply to this email directly or view it on GitHub.

I hope you are well. I'm trying to save and reload the canvas. It seems to be working well apart from when i scale text or images. They are positioned in the correct place but when i click on them the free transform handles are not in the correct position. Is there an easy way to fix this?

It sounds similar to this issue:

Are you using Raphael methods to apply transformations? If so, try using FreeTransform methods instead.

Feel free to open a new issue if you have questions.

Thanks for getting back to me. I think this problem is slightly different.
I'm using free transform. It works perfectly.
I'm trying to save the canvas to database then reload it. The text is in the correct position but the handles and bounding box are not in the correct place. This only happens on text and images that have been scaled or rotated prior to saving. If i move the handles the text will reposition inside the bounding box and continues to work as expected.

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How to access this JSON object - not defined error

This is the url that I call to get the JSON data : This is the url with the data : JSON Data I get the error - noCB is not defined . I guess I'm trying to access the JSON object the wrong way - but I'm unsure about the right way. Please let me know - I'm a beginner.

1 Answer 1

The response you're getting is using JSONP (not JSON). Instead of data.noCB.response.docs , you'd just use data.response.docs . noCB isn't part of the object, it's a function call (that's how JSONP works).

You also want to remove callback=noCB from the URL, so that jQuery will handle the JSONP plumbing for you.

You have a couple of other issues as well:

1. You're trying to use output before you've filled it in. See How do I return the response from an asynchronous call? for details.
2. Don't use for-in to loop through arrays unless you do it advisedly with safeguards; see For-each over an array in JavaScript? for details.

Finally, not an issue per se, but as long as you're using jQuery, you may as well use it for things like document.getElementById("listt").innerHTML = output; (e.g.: $("#listt").html(output); ).

$(document).ready(function() < var output = "
"; $.getJSON('https://search-a.akamaihd.net/typeahead/suggest/?solrformat=true&rows=20&q=*%3A*+AND+schoolid_s%3A1255&defType=edismax&qf=teacherfirstname_t%5E2000+teacherlastname_t%5E2000+teacherfullname_t%5E2000+autosuggest&bf=pow(total_number_of_ratings_i%2C2.1)&sort=total_number_of_ratings_i+desc&siteName=rmp&rows=20&start=0&fl=pk_id+teacherfirstname_t+teacherlastname_t+total_number_of_ratings_i+averageratingscore_rf+schoolid_s&fq=&prefix=schoolname_t%3A%22University+of+Texas+at+Austin%22&callback=?', function(data) < data.response.docs.forEach(function(doc) < output += "a"; >); output += "
"; document.getElementById("listt").innerHTML = output; >); >);

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