I have seen lots of jQuery examples where parameter size and name are unknown.
My URL is only going to ever have 1 string:
http://example.com?sent=yes
I just want to detect:
Does sent exist?
Is it equal to "yes"?
Best solution here.
var getUrlParameter = function getUrlParameter(sParam) {
var sPageURL = window.location.search.substring(1),
sURLVariables = sPageURL.split('&'),
sParameterName,
i;
for (i = 0; i < sURLVariables.length; i++) {
sParameterName = sURLVariables[i].split('=');
if (sParameterName[0] === sParam) {
return sParameterName[1] === undefined ? true : decodeURIComponent(sParameterName[1]);
}
}
return false;
};
And this is how you can use this function assuming the URL is,
http://dummy.com/?technology=jquery&blog=jquerybyexample.
var tech = getUrlParameter('technology');
var blog = getUrlParameter('blog');
Solution from 2023
We have: http://example.com?sent=yes
let searchParams = new URLSearchParams(window.location.search)
Does sent exist?
searchParams.has('sent') // true
Is it equal to "yes"?
let param = searchParams.get('sent')
and then just compare it.
jQuery code snippet to get the dynamic variables stored in the url as parameters and store them as JavaScript variables ready for use with your scripts:
$.urlParam = function(name){
var results = new RegExp('[\?&]' + name + '=([^&#]*)').exec(window.location.href);
if (results==null) {
return null;
}
return decodeURI(results[1]) || 0;
}
example.com?param1=name¶m2=&id=6
$.urlParam('param1'); // name
$.urlParam('id'); // 6
$.urlParam('param2'); // null
example params with spaces
http://www.jquery4u.com?city=Gold Coast
console.log($.urlParam('city'));
//output: Gold%20Coast
console.log(decodeURIComponent($.urlParam('city')));
//output: Gold Coast
I always stick this as one line. Now params has the vars:
params={};location.search.replace(/[?&]+([^=&]+)=([^&]*)/gi,function(s,k,v){params[k]=v})
multi-lined:
var params={};
window.location.search
.replace(/[?&]+([^=&]+)=([^&]*)/gi, function(str,key,value) {
params[key] = value;
}
);
as a function
function getSearchParams(k){
var p={};
location.search.replace(/[?&]+([^=&]+)=([^&]*)/gi,function(s,k,v){p[k]=v})
return k?p[k]:p;
}
which you could use as:
getSearchParams() //returns {key1:val1, key2:val2}
or
getSearchParams("key1") //returns val1
Yet another alternative function...
function param(name) {
return (location.search.split(name + '=')[1] || '').split('&')[0];
}
Using URLSearchParams:
var params = new window.URLSearchParams(window.location.search);
console.log(params.get('name'));
Be careful about the compatibility (Mostly it's fine, but IE and Edge, may be different story, check this for compatible reference: https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams)
May be its too late. But this method is very easy and simple
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="jquery.url.js"></script>
<!-- URL: www.example.com/correct/?message=done&year=1990 -->
<script type="text/javascript">
$(function(){
$.url.attr('protocol') // --> Protocol: "http"
$.url.attr('path') // --> host: "www.example.com"
$.url.attr('query') // --> path: "/correct/"
$.url.attr('message') // --> query: "done"
$.url.attr('year') // --> query: "1990"
});
UPDATE
Requires the url plugin : plugins.jquery.com/url
Thanks -Ripounet
Or you can use this neat little function, because why overcomplicated solutions?
function getQueryParam(param, defaultValue = undefined) {
location.search.substr(1)
.split("&")
.some(function(item) { // returns first occurence and stops
return item.split("=")[0] == param && (defaultValue = item.split("=")[1], true)
})
return defaultValue
}
which looks even better when simplified and onelined:
tl;dr one-line solution
var queryDict = {};
location.search.substr(1).split("&").forEach(function(item) {queryDict[item.split("=")[0]] = item.split("=")[1]})
result:
queryDict['sent'] // undefined or 'value'
But what if you have got encoded characters or multivalued keys?
You better see this answer: How can I get query string values in JavaScript?
Sneak peak
"?a=1&b=2&c=3&d&e&a=5&a=t%20e%20x%20t&e=http%3A%2F%2Fw3schools.com%2Fmy%20test.asp%3Fname%3Dståle%26car%3Dsaab"
> queryDict
a: ["1", "5", "t e x t"]
b: ["2"]
c: ["3"]
d: [undefined]
e: [undefined, "http://w3schools.com/my test.asp?name=ståle&car=saab"]
> queryDict["a"][1] // "5"
> queryDict.a[1] // "5"
This one is simple and worked for me
$.urlParam = function(name){
var results = new RegExp('[\?&]' + name + '=([^&#]*)').exec(window.location.href);
return results[1] || 0;
}
so if your url is http://www.yoursite.com?city=4
try this
console.log($.urlParam('city'));
Perhaps you might want to give Dentist JS a look? (disclaimer: I wrote the code)
code:
document.URL == "http://helloworld.com/quotes?id=1337&author=kelvin&message=hello"
var currentURL = document.URL;
var params = currentURL.extract();
console.log(params.id); // 1337
console.log(params.author) // "kelvin"
console.log(params.message) // "hello"
with Dentist JS, you can basically call the extract() function on all strings (e.g., document.URL.extract() ) and you get back a HashMap of all parameters found. It's also customizable to deal with delimiters and all.
Minified version < 1kb
I hope this will help.
<script type="text/javascript">
function getParameters() {
var searchString = window.location.search.substring(1),
params = searchString.split("&"),
hash = {};
if (searchString == "") return {};
for (var i = 0; i < params.length; i++) {
var val = params[i].split("=");
hash[unescape(val[0])] = unescape(val[1]);
}
return hash;
}
$(window).load(function() {
var param = getParameters();
if (typeof param.sent !== "undefined") {
// Do something.
}
});
</script>
Try this working demo http://jsfiddle.net/xy7cX/
API:
inArray : http://api.jquery.com/jQuery.inArray/
This should help :)
code
var url = "http://myurl.com?sent=yes"
var pieces = url.split("?");
alert(pieces[1] + " ===== " + $.inArray("sent=yes", pieces));
This will give you a nice object to work with
function queryParameters () {
var result = {};
var params = window.location.search.split(/\?|\&/);
params.forEach( function(it) {
if (it) {
var param = it.split("=");
result[param[0]] = param[1];
}
});
return result;
}
And then;
if (queryParameters().sent === 'yes') { .....
This might be overkill, but there is a pretty popular library now available for parsing URIs, called URI.js.
Example
var uri = "http://example.org/foo.html?technology=jquery&technology=css&blog=stackoverflow";
var components = URI.parse(uri);
var query = URI.parseQuery(components['query']);
document.getElementById("result").innerHTML = "URI = " + uri;
document.getElementById("result").innerHTML += "<br>technology = " + query['technology'];
// If you look in your console, you will see that this library generates a JS array for multi-valued queries!
console.log(query['technology']);
console.log(query['blog']);
<script src="https://cdnjs.cloudflare.com/ajax/libs/URI.js/1.17.0/URI.min.js"></script>
<span id="result"></span>
function GetRequestParam(param)
{
var res = null;
try{
var qs = decodeURIComponent(window.location.search.substring(1));//get everything after then '?' in URI
var ar = qs.split('&');
$.each(ar, function(a, b){
var kv = b.split('=');
if(param === kv[0]){
res = kv[1];
return false;//break loop
}
});
}catch(e){}
return res;
}
So simple you can use any url and get value
function getParameterByName(name, url) {
if (!url) url = window.location.href;
name = name.replace(/[\[\]]/g, "\\$&");
var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
results = regex.exec(url);
if (!results) return null;
if (!results[2]) return '';
return decodeURIComponent(results[2].replace(/\+/g, " "));
}
Usage Example
// query string: ?first=value1&second=&value2
var foo = getParameterByName('first'); // "value1"
var bar = getParameterByName('second'); // "value2"
Note: If a parameter is present several times (?first=value1&second=value2), you will get the first value (value1) and second value as (value2).
There's this great library:
https://github.com/allmarkedup/purl
which allows you to do simply
url = 'http://example.com?sent=yes';
sent = $.url(url).param('sent');
if (typeof sent != 'undefined') { // sent exists
if (sent == 'yes') { // sent is equal to yes
// ...
}
}
The example is assuming you're using jQuery. You could also use it just as plain javascript, the syntax would then be a little different.
http://example.com?sent=yes
Best solution here.
function getUrlParameter(name) {
name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]');
var regex = new RegExp('[\\?&]' + name + '=([^&#]*)');
var results = regex.exec(location.href);
return results === null ? '' : decodeURIComponent(results[1].replace(/\+/g, ' '));
};
With the function above, you can get individual parameter values:
getUrlParameter('sent');
This is based on Gazoris's answer, but URL decodes the parameters so they can be used when they contain data other than numbers and letters:
function urlParam(name){
var results = new RegExp('[\?&]' + name + '=([^&#]*)').exec(window.location.href);
// Need to decode the URL parameters, including putting in a fix for the plus sign
// https://stackoverflow.com/a/24417399
return results ? decodeURIComponent(results[1].replace(/\+/g, '%20')) : null;
}
There is another example with using URI.js library.
Example answers the questions exactly as asked.
var url = 'http://example.com?sent=yes';
var urlParams = new URI(url).search(true);
// 1. Does sent exist?
var sendExists = urlParams.sent !== undefined;
// 2. Is it equal to "yes"?
var sendIsEqualtToYes = urlParams.sent == 'yes';
// output results in readable form
// not required for production
if (sendExists) {
console.log('Url has "sent" param, its value is "' + urlParams.sent + '"');
if (urlParams.sent == 'yes') {
console.log('"Sent" param is equal to "yes"');
} else {
console.log('"Sent" param is not equal to "yes"');
}
} else {
console.log('Url hasn\'t "sent" param');
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/URI.js/1.18.2/URI.min.js"></script>
Coffeescript version of Sameer's answer
getUrlParameter = (sParam) ->
sPageURL = window.location.search.substring(1)
sURLVariables = sPageURL.split('&')
i = 0
while i < sURLVariables.length
sParameterName = sURLVariables[i].split('=')
if sParameterName[0] == sParam
return sParameterName[1]
i++
A slight improvement to Sameer's answer, cache params into closure to avoid parsing and looping through all parameters each time calling
var getURLParam = (function() {
var paramStr = decodeURIComponent(window.location.search).substring(1);
var paramSegs = paramStr.split('&');
var params = [];
for(var i = 0; i < paramSegs.length; i++) {
var paramSeg = paramSegs[i].split('=');
params[paramSeg[0]] = paramSeg[1];
}
console.log(params);
return function(key) {
return params[key];
}
})();
I use this and it works.
http://codesheet.org/codesheet/NF246Tzs
function getUrlVars() {
var vars = {};
var parts = window.location.href.replace(/[?&]+([^=&]+)=([^&]*)/gi, function(m,key,value) {
vars[key] = value;
});
return vars;
}
var first = getUrlVars()["id"];
With vanilla JavaScript, you could easily take the params (location.search), get the substring (without the ?) and turn it into an array, by splitting it by '&'.
As you iterate through urlParams, you could then split the string again with '=' and add it to the 'params' object as object[elmement[0]] = element[1]. Super simple and easy to access.
http://www.website.com/?error=userError&type=handwritten
var urlParams = location.search.substring(1).split('&'),
params = {};
urlParams.forEach(function(el){
var tmpArr = el.split('=');
params[tmpArr[0]] = tmpArr[1];
});
var error = params['error'];
var type = params['type'];
What if there is & in URL parameter like filename="p&g.html"&uid=66
In this case the 1st function will not work properly. So I modified the code
function getUrlParameter(sParam) {
var sURLVariables = window.location.search.substring(1).split('&'), sParameterName, i;
for (i = 0; i < sURLVariables.length; i++) {
sParameterName = sURLVariables[i].split('=');
if (sParameterName[0] === sParam) {
return sParameterName[1] === undefined ? true : decodeURIComponent(sParameterName[1]);
}
}
}
Admittedly I'm adding my answer to an over-answered question, but this has the advantages of:
-- Not depending on any outside libraries, including jQuery
-- Not polluting global function namespace, by extending 'String'
-- Not creating any global data and doing unnecessary processing after match found
-- Handling encoding issues, and accepting (assuming) non-encoded parameter name
-- Avoiding explicit for loops
String.prototype.urlParamValue = function() {
var desiredVal = null;
var paramName = this.valueOf();
window.location.search.substring(1).split('&').some(function(currentValue, _, _) {
var nameVal = currentValue.split('=');
if ( decodeURIComponent(nameVal[0]) === paramName ) {
desiredVal = decodeURIComponent(nameVal[1]);
return true;
}
return false;
});
return desiredVal;
};
Then you'd use it as:
var paramVal = "paramName".urlParamValue() // null if no match
If you want to find a specific parameter from a specific url:
function findParam(url, param){
var check = "" + param;
if(url.search(check )>=0){
return url.substring(url.search(check )).split('&')[0].split('=')[1];
}
}
var url = "http://www.yourdomain.com/example?id=1&order_no=114&invoice_no=254";
alert(findParam(url,"order_no"));
Another solution that uses jQuery and JSON, so you can access the parameter values through an object.
var loc = window.location.href;
var param = {};
if(loc.indexOf('?') > -1)
{
var params = loc.substr(loc.indexOf('?')+1, loc.length).split("&");
var stringJson = "{";
for(var i=0;i<params.length;i++)
{
var propVal = params[i].split("=");
var paramName = propVal[0];
var value = propVal[1];
stringJson += "\""+paramName+"\": \""+value+"\"";
if(i != params.length-1) stringJson += ",";
}
stringJson += "}";
// parse string with jQuery parseJSON
param = $.parseJSON(stringJson);
}
Assuming your URL is http://example.com/?search=hello+world&language=en&page=3
After that it's only a matter of using the parameters like this:
param.language
to return
en
The most useful usage of this is to run it at page load and make use of a global variable to use the parameters anywhere you might need them.
If your parameter contains numeric values then just parse the value.
parseInt(param.page)
If there are no parameters param will just be an empty object.
$.urlParam = function(name) {
var results = new RegExp('[\?&]' + name + '=([^&#]*)').exec(window.location.href);
return results[1] || 0;
}
use this
$.urlParam = function(name) {
var results = new RegExp('[\?&]' + name + '=([^&#]*)').exec(window.location.href);
return results[1] || 0;
}
how can i change the style of menu, if it is selected, without php?
i can do it by php
`<? if($_GET[id] == "this_menu") echo "style='color:red'"?>`
but i want to do it without php. is it possible? thanks
if (document.location.search.match(/[?&]id=this_menu([&.*])?$/)) {
document.getElementById('yourId').setAttribute('style', 'color: red');
}
Do you want to do that on client? if so, use JavaScript.
With JS
document.getElementById(gup("param")).setAttribute('style', 'color: red');
function gup( param )
{
var name =
param.toLowerCase();
var regexS =
"[\?&]"+name+"=([^&#]*)";
var regex = new RegExp( regexS );
var tmpURL = window.location.href;
var results = egex.exec( tmpURL );
if( results == null )
{ // Try to find an
alternative value
if (typeof alternatives == "object")
{
if(typeof alternatives[name] !="undefined")
{
return alternatives[name];
}
}
return "";
}
else
{
return results[1];
}
};
it can be done easily done by javascript:
use something like this
document.getElementById('myMenu').style.color='#f0f0f0';
Is there a foreach code in JQuery as in PHP?
I have a code in php,like
<?php foreach ($viewfields as $viewfield): ?>
if ("<?php echo $viewfield['Attribute']['required'];?>" == 'true') {
$("<span class='req'><em> * </em></span>").appendTo("#fb_contentarea_col1down21 #label<?php echo $viewfield['Attribute']['sequence_no']?>");
}
if (<?=$viewfield['Attribute']['type'];?> == 'text' || <?=$viewfield['Attribute']['type'];?> == 'date' || <?=$viewfield['Attribute']['type'];?> == 'number') {
$("<input id=input<?=$viewfield['Attribute']['sequence_no'];?> type= 'text' style= 'width:<?=$viewfield['Attribute']['size'];?>px' data-attr=<?=$viewfield['Attribute']['type'];?> ></input><br>").appendTo("#fb_contentarea_col1down21 #<?=$viewfield['Attribute']['sequence_no'];?>");
}
else if (<?=$viewfield['Attribute']['type'];?> == 'textarea') {
$("<textarea style= 'width:<?=$viewfield['Attribute']['size'];?>px' data-attr=<?=$viewfield['Attribute']['type'];?> id=input<?=$viewfield['Attribute']['sequence_no'];?>></textarea><br>").appendTo("#fb_contentarea_col1down21 #<?=$viewfield['Attribute']['sequence_no'];?>");
}
<?php endforeach; ?>
Is there any equivalent of foreach in Jquery? How can I accomplish this same functioality in jQuery?
EDIT 1:
I thought it worked but I get an error. The code and the error message is given below.
for (<?=$viewfield;?> in <?=$viewfields;?>) {
if ("<?=$viewfield['Attribute']['required'];?>" == 'true') {
$("<span class='req'><em> * </em></span>").appendTo("#fb_contentarea_col1down21 #label<?php echo $viewfield['Attribute']['sequence_no']?>");
}
if (<?=$viewfield['Attribute']['type'];?> == 'text' || <?=$viewfield['Attribute']['type'];?> == 'date' || <?=$viewfield['Attribute']['type'];?> == 'number') {
$("<input id=input<?=$viewfield['Attribute']['sequence_no'];?> type= 'text' style= 'width:<?=$viewfield['Attribute']['size'];?>px' data-attr=<?=$viewfield['Attribute']['type'];?> ></input><br>").appendTo("#fb_contentarea_col1down21 #<?=$viewfield['Attribute']['sequence_no'];?>");
}
else if (<?=$viewfield['Attribute']['type'];?> == 'textarea') {
$("<textarea style= 'width:<?=$viewfield['Attribute']['size'];?>px' data-attr=<?=$viewfield['Attribute']['type'];?> id=input<?=$viewfield['Attribute']['sequence_no'];?>></textarea><br>").appendTo("#fb_contentarea_col1down21 #<?=$viewfield['Attribute']['sequence_no'];?>");
}
}
Error message:
syntax error
for( in Array)
Can someone help me..
The $.each function is similar.
It allows you to iterate arrays using a callback function where you have access to each item:
var arr = [ "one", "two", "three", "four", "five" ];
$.each(arr, function(index, value) {
// work with value
});
Maybe is useful to know, if you want to break the loop, you can do it with return false; or if you want to skip only one iteration (continue), you return true;
If you want to iterate an object, I would recommend the JavaScript variant:
for (var key in obj) {
alert(key + ': ' + obj[key]);
}
You can also iterate objects in jQuery like this:
Note! Doing this is pretty pointless unless you think this syntax is much simpler to maintain. The below syntax has much more overhead than the above, standard JavaScript, for-loop.
$.each(obj, function (key, value) {
alert(key + ': ' + value);
});
To iterate arrays, this is how you do it in standard JavaScript (assuming arr is the array):
for (var i = 0, l = arr.length; i < l; i++) {
alert(i + ': ' + arr[i]);
}
To do it in jQuery, you can do it like this:
$.each(arr, function (index, value) {
alert(index + ': ' + value);
});
There is jQuery.each.
Javascript supports the for(data in data_array) syntax. jQuery also has a $.each function (as already mentioned)
Jquery operating on selectors:
$('a').each(function() {
$(this).click(function(e) {
e.preventDefault()
var href = this.href;
open(href);
});
// operate on the anchor node.
});
jQuery direct $.each:
var a = ['one', 'two'];
$.each(a, function() {
alert(this)
});
JS: Vanilla for loop
for ( var i = 0, len = 10; i<l; ++i ) {
alert(i)
}
JS #2: vanilla for
var humanLimbs = ['arms', 'legs'];
for ( var limb in humanLimbs ) {
if ( humanLimbs.hasOwnProperty(limb) ) {
alert( limb )
}
}
Js #3: infinite loop
for (;;) { alert(1) } // dont try this :p