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In what situations would AJAX long/short polling be preferred over HTML5 WebSockets?
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WebSockets is definitely the future.
Long polling is a dirty workaround to prevent creating connections for each request like AJAX does -- but long polling was created when WebSockets didn't exist. Now due to WebSockets,
lo...
Insert code into the page context using a content script
...pt):
var s = document.createElement('script');
// TODO: add "script.js" to web_accessible_resources in manifest.json
s.src = chrome.runtime.getURL('script.js');
s.onload = function() {
this.remove();
};
(document.head || document.documentElement).appendChild(s);
Note: For security reasons, Chro...
How to change an input button image using CSS?
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guys, check the answer by SI Web Design below. please vote up if those answer is better.
– deval
Jan 2 '14 at 5:35
add a comment
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Run java jar file on a server as background process
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You can try this:
#!/bin/sh
nohup java -jar /web/server.jar &
The & symbol, switches the program to run in the background.
The nohup utility makes the command passed as an argument run in the background even after you log out.
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Do HTML WebSockets maintain an open connection for each client? Does this scale?
I am curious if anyone has any information about the scalability of HTML WebSockets. For everything I've read it appears that every client will maintain an open line of communication with the server. I'm just wondering how that scales and how many open WebSocket connections a server can handle. Mayb...
When using Spring Security, what is the proper way to obtain current username (i.e. SecurityContext)
I have a Spring MVC web app which uses Spring Security. I want to know the username of the currently logged in user. I'm using the code snippet given below . Is this the accepted way?
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How to disable CSS in Browser for testing purposes
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The Web Developer plugin for Firefox and Chrome is able to do this
Once you have installed the plugin the option is available in the CSS menu. For example, CSS > Disable Styles > Disable All Styles
Alternatively with t...
Local file access with JavaScript
...licious authors to
deliver scripts to run on a client
computer via the web. Browser authors
contain this risk using two
restrictions. First, scripts run in a
sandbox in which they can only perform
web-related actions, not
general-purpose programming tasks like
creating files.
2016 ...
WebSockets vs. Server-Sent events/EventSource
Both WebSockets and Server-Sent Events are capable of pushing data to browsers. To me they seem to be competing technologies. What is the difference between them? When would you choose one over the other?
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How can I scroll a web page using selenium webdriver in python?
I am currently using selenium webdriver to parse through facebook user friends page and extract all ids from the AJAX script. But I need to scroll down to get all the friends. How can I scroll down in Selenium. I am using python.
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