1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Using JavaScript to extract GET parameters from URL query string

Discussion in 'JavaScript and AJAX' started by ManzZup, Oct 21, 2013.

  1. ManzZup

    ManzZup New Member

    Joined:
    May 9, 2009
    Messages:
    278
    Likes Received:
    43
    Trophy Points:
    0
    Occupation:
    Production Manager:Software @ ZONTEK
    Location:
    Sri Lanka
    Home Page:
    So i was working on an awesome project when i wanted to extract GET parameters from the URL string. Like in php $_GET['param'], i need to use javascript since the front end is building on an REST API [that is no direct interaction between front end and back end].

    You probably should ave seen this feature used in google search and may others, but the problem is JavaScript donot provide such function to access the parameters like PHP. After searching for ages i found dozen or more codes that were good, bad and unusable. But most of the code weren't much portable or user friendly. So i decided to make my own JS class for it :)

    JsPara



    Download from github
    JsPara Homepage

    Features

    * Extract parameter=value pairs
    ex: index.html?search=test
    * Extract null valued parameters
    ex: index.html?c&d
    * Extract parameters followed by hash (#) (used in AJAX based sites)
    ex: index.html#search=test

    Logic

    JsPara simply use regular expression to find parameter=value pairs and then parameters with null value pairs.

    The Code



    Usage

    Using JsPara is so damn easy. You just have to attach the script (which is only 2kb) and initiate a new JsPara object

    For the sake of the tutorial, assume that the URL used here is
    http://example.com/index.html?search=keyword&nothing&page=1#p=new

    1) Initiate a JsPara object with window.location

    Code:
     jp = new JsPara(window.location);
     //ex: http://example.com/index.html?search=keyword&nothing&page=1#p=new
    
    2) To get all the extracted parameters [gives an array]
    Code:
     var paras = jp.params;
     //output: search, page, p, nothing
    
    3) To get value corresponding to a parameter
    Code:
     var search = jp.param['search']
     //output: keyword
    
    NOTE: Gives null if no value for the parameter

    4) Get some other info about the URL
    Code:
    var hostname = jp.hostname; // example.com
    var protocol = jp.protocol; // http
    var path = jp.path; // example.com/index.html
    
    Limitations

    1) Some characters are not valid in the URL [since the regex breaks if those characters are present]

    Valid parameter,value names

    & and # are not allowed [you dont say :D]
    Code:
    test
    test123
    test_me
    test me
    test.me
    "search"
    [1,"abc",'def']
    
    so that's basically it, but this is HIGLY BETA
    so please please report me bugs and feature requests :)

    Cyah
     

Share This Page