Using the GET parameter of a URL in JavaScript

Question

If I am on a page such as   http   somesite com somepage php param1 asdf  In the JavaScript of that page  I would like to set a variable to the value of the parameter in the GET part of the URL   So in JavaScript    lt script gt     param1var                would be replaced with the code to get asdf from URI  lt  script gt    What would       be

User · Answer

You don t need to do anything special  actually  You can mix JavaScript and PHP together to get variables from PHP straight into JavaScript   var param1val     lt  php echo   GET  param1     gt

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Using jquery   I ve used this before   http   projects allmarkedup com jquery url parser   and it worked pretty well

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From my programming archive   function querystring key       var re new RegExp          amp    key            amp       gi       var r     m     while   m re exec document location search      null  r r length  m 1      return r      If the value doesn t exist  an empty array is returned  If the value exists  an array is return that has one item  the value  If several values with the name exists  an array containing each value is returned   Examples   var param1var   querystring  param1   0    document write querystring  name      if  querystring  id     42   alert  We apoligize for the inconvenience      if  querystring  button   length gt 0  alert querystring  info

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You can use this function  function getParmFromUrl url  parm        var re   new RegExp       amp      parm         amp      amp            var match   url match re       return match   match 1

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Here s some sample code for that    lt script gt  var param1var   getQueryVariable  param1     function getQueryVariable variable      var query   window location search substring 1     var vars   query split   amp       for  var i 0 i lt vars length i          var pair   vars i  split           if  pair 0     variable          return pair 1                alert  Query Variable     variable     not found       lt  script gt

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If you re already running a php page then   php bit        json       json encode   REQUEST  JSON FORCE OBJECT       print   lt script gt var getVars    json  lt  script gt      js bit       var param1var   getVars param1var    But for Html pages Jose Basilio s solution looks good to me   Good luck

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Here is a version that JSLint likes     jslint browser  true    var GET        function  input         use strict       if  input length  gt  1            var param   input slice 1  replace     g       split   amp                 plength   param length              tmp              p           for  p   0  p  lt  plength  p    1                tmp   param p  split                   GET decodeURIComponent tmp 0      decodeURIComponent tmp 1                      window location search     window alert JSON stringify GET      Or if you need support for several values for one key like eg   key value1 amp key value2 you can use this     jslint browser  true    var GET        function  input         use strict       if  input length  gt  1            var params   input slice 1  replace     g       split   amp                 plength   params length              tmp              key              val              obj              p           for  p   0  p  lt  plength  p    1                tmp   params p  split                   key   decodeURIComponent tmp 0                val   decodeURIComponent tmp 1                if  GET hasOwnProperty key                     obj   GET key                   if  obj constructor     Array                        obj push val                     else                       GET key     obj  val                                   else                   GET key    val                                  window location search     window alert JSON stringify GET

User · Answer

This looked ok   function gup  name       name   name replace                replace                    var regexS         amp    name       amp           var regex   new RegExp  regexS       var results   regex exec  window location href       if  results    null         return        else       return results 1       From http   www netlobo com url query string javascript html

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Here s how you could do it in Coffee Script  just if anyone is interested    decodeURIComponent  v split        1    if decodeURIComponent  v split        0       name for v in window location search substring  1   split    amp

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You can get the  search  part of the location object - and then parse it out   var matches    param1     amp        exec window location search   var param1   matches 1

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I made this variation of gnarf s solution  so the call and the result is similar to PHP   function S GET id       var a   new RegExp id       amp              return decodeURIComponent a exec window location search  1        But as being called in a function slows the process  its better to use as global   window  var name     decodeURIComponent   var in get     amp        exec window location search  1      UPDATE  As I m still learning JS  I created a better answer in a more JS behaviour   Url         get get            var vars              if window location search length   0              window location search replace     amp        amp         amp     gi  function m key value                   key decodeURIComponent key                   if typeof vars key     undefined    vars key   decodeURIComponent value                    else  vars key      concat vars key   decodeURIComponent value                             return vars             This allows to be called just using Url get   Example The url  param1 param1Value amp param2 param2Value can be called like   Url get param1    param1Value  Url get param2    param2Value    here is a snipet    x000D   x000D     URL GET params x000D  url     a 2 amp a 3 amp b 2 amp a 4   x000D   x000D  Url     x000D      get get    x000D          var vars      x000D          if url length   0  x000D              url replace     amp        amp         amp     gi  function m key value   x000D                  key decodeURIComponent key   x000D                  if typeof vars key     undefined    vars key   decodeURIComponent value    x000D                  else  vars key      concat vars key   decodeURIComponent value     x000D                  x000D          return vars  x000D        x000D     x000D   x000D  document querySelector  log   innerHTML   JSON stringify Url get   x000D   lt log gt  lt  log gt  x000D   x000D   x000D

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