javascript - Use local css file if link to online css file is dead -


the problem:

i using w3.css(if enter w3schools.com site down maintenance) styling website.the problem here w3schools.com going down times times.

then website looks creepy , don't need that.

so have local copy of w3.css on computer , server holding website.

online:

<link rel="stylesheet" href="http://www.w3schools.com/lib/w3.css">

local:

<link rel="stylesheet" href="../css/w3.css">

the question:

how know when link pointing on w3schools dead,so can use local w3.css file.how can that?

1)detect if broken

2)use local css before website has been loaded

finally

what big companies doing that?if 3-4 webservices go down whole company going down.....

i new web developing so..thank you...

edit:(i have in mind)

loading local(...site in on server,that local mean) , w3schools file , increase site loading...

its possible php. haven't tested should work.

put inside <head> tag.

<?php  if (isdomainavailible('http://www.w3schools.com')){     echo '<link rel="stylesheet" href="http://www.w3schools.com/lib/w3.css">'; } else {     echo '<link rel="stylesheet" href="../css/w3.css">'; }  //returns true, if domain availible, false if not    function isdomainavailible($domain)    {            //check, if valid url provided            if(!filter_var($domain, filter_validate_url))            {                    return false;            }             //initialize curl            $curlinit = curl_init($domain);            curl_setopt($curlinit,curlopt_connecttimeout,10);            curl_setopt($curlinit,curlopt_header,true);            curl_setopt($curlinit,curlopt_nobody,true);            curl_setopt($curlinit,curlopt_returntransfer,true);             //get answer            $response = curl_exec($curlinit);             curl_close($curlinit);             if ($response) return true;             return false;    }  ?>

reference: https://css-tricks.com/snippets/php/check-if-website-is-available/


-

Comments

Post a Comment

Popular posts from this blog

java - SSE Emitter : Manage timeouts and complete() -

i writing web app multiple listeners(evcentsource sse clients js) connected server . want store sse emitter per connected listener : can done in memory or other means assigning id each client able achieve far now question ; how send response/event specific client connected web app ? while doing sseemmiters stored either getting completed or timed out. how prevent ? how keep sseemmiter available open infinite time (till client closes) , send events selectively .
Read more

jquery - uncaught exception: DataTables Editor - remote hosting of code not allowed -

i'm trying implement crud operation using datatableseditor using datatables.but i'm getting error messages: 1)uncaught exception: datatables editor - remote hosting of code not allowed. please see http://editor.datatables.net details on how purchase editor license 2)typeerror: a.editor undefined 3) $.fn.datatable.editor not constructor" what reason? here configuration: <%@ page language="java" contenttype="text/html; charset=iso-8859-1" pageencoding="iso-8859-1"%> <!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=iso-8859-1"> <title>insert title here</title> <link rel="stylesheet" type="text/css" href="//cdn.datatables.net/1.10.12/css/jquery.datatables.min.css"> <link re...
Read more

java - How to resolve error - package com.squareup.okhttp3 doesn't exist? -

i trying convert json java object use of gson in maven, following youtube video guidance - https://www.youtube.com/watch?v=vqgghm9pwe0 , theres error occurs when in main class error - package com.squareup.okhttp3 doesn't exist. code below: java package com.codebeasty.json; import com.squareup.okhttp3.okhttpclient; public class main { private static okhttpclient client = new okhttpclient(); public static void main (string [] args) { } } i put in dependency in pom.xml: <dependencies> <dependency> <groupid>com.squareup.okhttp3</groupid> <artifactid>okhttp</artifactid> <version>3.4.2</version> </dependency> <dependency> <groupid>com.google.code.gson</groupid> <artifactid>gson</artifactid> <version>2.8.0</version> </dependency> </dependencies> i dont understand why doesn't recognize com.squareup. there may need download? have downl...
Read more