xmlhttprequest

Allow Google Chrome to use XMLHttpRequest to load a URL from a local file

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Using –disable-web-security switch is quite dangerous! Why disable security at all while you can just allow XMLHttpRequest to access files from other files using –allow-file-access-from-files switch? Before using these commands be sure to end all running instances of Chrome. On Windows: chrome.exe –allow-file-access-from-files On Mac: open /Applications/Google\ Chrome.app/ –args –allow-file-access-from-files Discussions of this “feature” of … Read more

No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘…’ is therefore not allowed access

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Use addHeader Instead of using setHeader method, response.addHeader(“Access-Control-Allow-Origin”, “*”); * in above line will allow access to all domains. For allowing access to specific domain only: response.addHeader(“Access-Control-Allow-Origin”, “http://www.example.com”); Check this blog post.

What is the difference between XMLHttpRequest, jQuery.ajax, jQuery.post, jQuery.get

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XMLHttpRequest is the raw browser object that jQuery wraps into a more usable and simplified form and cross browser consistent functionality. jQuery.ajax is a general Ajax requester in jQuery that can do any type and content requests. jQuery.get and jQuery.post on the other hand can only issue GET and POST requests. If you don’t know … Read more

Sending a JSON to server and retrieving a JSON in return, without JQuery

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Sending and receiving data in JSON format using POST method // Sending and receiving data in JSON format using POST method // var xhr = new XMLHttpRequest(); var url = “url”; xhr.open(“POST”, url, true); xhr.setRequestHeader(“Content-Type”, “application/json”); xhr.onreadystatechange = function () { if (xhr.readyState === 4 && xhr.status === 200) { var json = JSON.parse(xhr.responseText); console.log(json.email … Read more

Why am I seeing an “origin is not allowed by Access-Control-Allow-Origin” error here? [duplicate]

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Javascript is limited when making ajax requests outside of the current domain. Ex 1: your domain is example.com and you want to make a request to test.com => you cannot. Ex 2: your domain is example.com and you want to make a request to inner.example.com => you cannot. Ex 3: your domain is example.com:80 and … Read more

What does it mean when an HTTP request returns status code 0?

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Many of the answers here are wrong. It seems people figure out what was causing status==0 in their particular case and then generalize that as the answer. Practically speaking, status==0 for a failed XmlHttpRequest should be considered an undefined error. The actual W3C spec defines the conditions for which zero is returned here: https://fetch.spec.whatwg.org/#concept-network-error As … Read more

HTML5 Pre-resize images before uploading

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Yes, use the File API, then you can process the images with the canvas element. This Mozilla Hacks blog post walks you through most of the process. For reference here’s the assembled source code from the blog post: // from an input element var filesToUpload = input.files; var file = filesToUpload[0]; var img = document.createElement(“img”); … Read more

Origin null is not allowed by Access-Control-Allow-Origin

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Origin null is the local file system, so that suggests that you’re loading the HTML page that does the load call via a file:/// URL (e.g., just double-clicking it in a local file browser or similar). Most browsers apply the Same Origin Policy to local files by disallowing even loading files from the same directory … Read more

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)