jquery ajax function not working
put the event handler function inside $(document).ready(function(){…}). it shall work now also add preventDefault() to restrict page refreshing
ajax
JQuery: ‘Uncaught TypeError: Illegal invocation’ at ajax request – several elements
Thanks to the talk with Sarfraz we could figure out the solution. The problem was that I was passing an HTML element instead of its value, which is actually what I wanted to do (in fact in my php code I need that value as a foreign key for querying my cities table and filter correct entries). So, instead … Read more
What exactly is Ajax request? Is it different from Servlet Request?
An Ajax call is an asynchronous request initiated by the browser that does not directly result in a page transition. A servlet request is a Java-specifc term (servlets are a Java specification) for servicing an HTTP request that could get a simple GET or POST (etc) or an Ajax request. An Ajax (“Asynchronous Javascript and … Read more
jQuery’s .on() method combined with the submit event
You need to delegate event to the document level $(‘form.remember’).on(‘submit’ work same as $(‘form.remember’).submit( but when you use $(document).on(‘submit’,’form.remember’ then it will also work for the DOM added later.
What is ‘xmlhttp.setRequestHeader();’ and in which situations is it used?
HTTP is a protocol. Part of that protocol is the concept of request headers. When an xhr happens, text is exchanged between the client and server. Request headers are part of the text that the client sends to the server. This is a way to set the request headers. The arguments you see are 1) … Read more
Download a file by jQuery.Ajax
2019 modern browsers update This is the approach I’d now recommend with a few caveats: A relatively modern browser is required If the file is expected to be very large you should likely do something similar to the original approach (iframe and cookie) because some of the below operations could likely consume system memory at least as … Read more
Uncaught TypeError: Cannot read property ‘toLowerCase’ of undefined
When you call loadTeachers() on DOMReady the context of this will not be the #CourseSelect element. You can fix this by triggering a change() event on the #CourseSelect element on load of the DOM: Alternatively can use $.proxy to change the context the function runs under: Or the vanilla JS equivalent of the above, bind():
FormData append not working
When logging a formData object with just console.log(formData) it always returns empty, as you can’t log formData. If you just have to log it before sending it, you can use entries() to get the entries in the formData object
Call PHP function from jQuery?
AJAX does the magic:
How to allow CORS in react.js?
Possible repeated question from How to overcome the CORS issue in ReactJS CORS works by adding new HTTP headers that allow servers to describe the set of origins that are permitted to read that information using a web browser. This must be configured in the server to allow cross domain. You can temporary solve this … Read more