Auto Link shorting via PHP&AJAX (bit.ly) - javascript
I would like to build a form (VIA POST METHOD) with just one field (url - link shortening). Now the question is how and if is it possible to build a form that detects the value of the URL field is a link and automatically shortens it rather than waiting you click Send (for exmaple like the web of Bit.ly).
The main idea is once the field is an identifier that value is a proper Hyperlink is directly sends and shortens (And the field is replaced by a shortened link) it without waiting for the click on the SEND.
index.html
<html>
<head>
<script>
function showHint(str) {
if (str.length == 0) {
document.getElementById("txtHint").innerHTML = "";
return;
} else {
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("txtHint").innerHTML = this.responseText;
}
};
xmlhttp.open("GET", "gethint.php?q=" + str, true);
xmlhttp.send();
}
}
</script>
</head>
<body>
<p><b>Start typing a url in the input field below:</b></p>
<form>
Url: <input type="text" onkeyup="showHint(this.value)">
</form>
<p><span id="txtHint"></span></p>
</body>
</html>
gethint.php
<?php
// get the q parameter from URL
$q = $_REQUEST["q"];
$hint = "";
if (!filter_var($q, FILTER_VALIDATE_URL) === FALSE) {
// short the link
$rand = rand(1,1000);
$hint = 'http://domain.com/'.$rand; }
echo $hint === "" ? "Not a valid URL" : $hint; ?>
I'd use jQuery for the event triggering/AJAX and https://gist.github.com/dperini/729294 for weburl regex.
I'm not that at home on pure JavaScript AJAX calls, but is
xmlhttp.open("GET")
the right way to go at it if you want to make a POST?
Anyway the main thing you're missing is
function isUrl(url){
var regex = /^(?:(?:https?|ftp):\/\/)(?:\S+(?::\S*)?#)?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,}))\.?)(?::\d{2,5})?(?:[/?#]\S*)?$/i;
if(regex.test(url)){
return regex.test(url);
}else{
return regex.test("http://"+url);
}
}
So this should be your new index.html
<html>
<head>
<script>
var extensions = [".aero",".biz",".cat",".com",".coop",".edu",".gov",".info",".int",".jobs",".mil",".mobi",".museum",".name",".net",".org",".travel",".ac",".ad",".ae",".af",".ag",".ai",".al",".am",".an",".ao",".aq",".ar",".as",".at",".au",".aw",".az",".ba",".bb",".bd",".be",".bf",".bg",".bh",".bi",".bj",".bm",".bn",".bo",".br",".bs",".bt",".bv",".bw",".by",".bz",".ca",".cc",".cd",".cf",".cg",".ch",".ci",".ck",".cl",".cm",".cn",".co",".cr",".cs",".cu",".cv",".cx",".cy",".cz",".de",".dj",".dk",".dm",".do",".dz",".ec",".ee",".eg",".eh",".er",".es",".et",".eu",".fi",".fj",".fk",".fm",".fo",".fr",".ga",".gb",".gd",".ge",".gf",".gg",".gh",".gi",".gl",".gm",".gn",".gp",".gq",".gr",".gs",".gt",".gu",".gw",".gy",".hk",".hm",".hn",".hr",".ht",".hu",".id",".ie",".il",".im",".in",".io",".iq",".ir",".is",".it",".je",".jm",".jo",".jp",".ke",".kg",".kh",".ki",".km",".kn",".kp",".kr",".kw",".ky",".kz",".la",".lb",".lc",".li",".lk",".lr",".ls",".lt",".lu",".lv",".ly",".ma",".mc",".md",".mg",".mh",".mk",".ml",".mm",".mn",".mo",".mp",".mq",".mr",".ms",".mt",".mu",".mv",".mw",".mx",".my",".mz",".na",".nc",".ne",".nf",".ng",".ni",".nl",".no",".np",".nr",".nu",".nz",".om",".pa",".pe",".pf",".pg",".ph",".pk",".pl",".pm",".pn",".pr",".ps",".pt",".pw",".py",".qa",".re",".ro",".ru",".rw",".sa",".sb",".sc",".sd",".se",".sg",".sh",".si",".sj",".sk",".sl",".sm",".sn",".so",".sr",".st",".su",".sv",".sy",".sz",".tc",".td",".tf",".tg",".th",".tj",".tk",".tm",".tn",".to",".tp",".tr",".tt",".tv",".tw",".tz",".ua",".ug",".uk",".um",".us",".uy",".uz", ".va",".vc",".ve",".vg",".vi",".vn",".vu",".wf",".ws",".ye",".yt",".yu",".za",".zm",".zr",".zw"];
var delay = (function(){
var timer = 0;
return function(callback, ms){
clearTimeout (timer);
timer = setTimeout(callback, ms);
};
})();
function isUrl(url){
var regex = /^(?:(?:https?|ftp):\/\/)(?:\S+(?::\S*)?#)?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]-*)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,}))\.?)(?::\d{2,5})?(?:[/?#]\S*)?$/i;
if(regex.test(url)){
return regex.test(url);
}else{
return regex.test("http://"+url);
}
}
function showHint(str) {
delay(function(){
str = str.toLowerCase();
var dot = str.lastIndexOf(".");
var extension = str.substr(dot);
extension = extension.split('/')[0];
var found = $.inArray(extension, extensions) > -1;
if (!isUrl(str)||!found) {
document.getElementById("txtHint").innerHTML = "";
return;
} else {
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("txtHint").innerHTML = this.responseText;
}
};
xmlhttp.open("GET", "gethint.php?q=" + str, true);
xmlhttp.send();
}
}, 500)
}
</script>
</head>
<body>
<p><b>Start typing a url in the input field below:</b></p>
<form>
Url: <input type="text" onkeyup="showHint(this.value)">
</form>
<p><span id="txtHint"></span></p>
</body>
</html>
edit: Say you will start typing in http://www.example.net.. The AJAX will trigger on "http://www.example.ne" and then again when you add the last letter. To avoid that, you might try "change" instead of "keyup" event.
edit2: Now checks against list of valid domain extensions
edit3: Now waits half a second before posting the result.
edit4: Small oversight while checking for extensions, fixed with
extension = extension.split('/')[0];
Also if you want to enable users to write URL's without "http://" and similar, you'll need an edited regex or write a small hack that adds that to your string before you send it into "isUrl()".
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