How to check if a query string value is present via JavaScript

Question

How can I check if the query string contains a q  in it using JavaScript or jQuery

User · Answer

This should help   function getQueryParams        try          url   window location href          query str   url substr url indexOf      1  url length-1           r params   query str split   amp             params              for  i in r params               param   r params i  split                   params  param 0      param 1                     return params            catch e          return

User · Answer

var field    q   var url   window location href  if url indexOf       field           -1      return true  else if url indexOf   amp     field           -1      return true  return false

User · Answer

this function help you to get parameter from URL in JS  function getQuery q        return  window location search match new RegExp     amp      q         amp              null   1

User · Answer

The plain javascript code sample which answers your question literally   return location search indexOf  q    gt  0    The plain javascript code sample which attempts to find if the q parameter exists and if it has a value   var queryString location search  var params queryString substring 1  split   amp     for var i 0  i lt params length  i         var pair params i  split           if decodeURIComponent pair 0     q   amp  amp  pair 1           return true    return false

User · Answer

one more variant  but almost the same as Gumbos solution   var isDebug   function        return window location href search     amp  debug       -1

User · Answer

Using URL   url   new URL window location href    if  url searchParams get  test           EDIT  if you re sad about compatibility  I d highly suggest https   github com medialize URI js

User · Answer

Try this    field  search   var pattern       amp  search    var URL   location search   if pattern test URL         alert  Found        else      alert  Not found         JSFiddle  https   jsfiddle net codemirror zj4qyao2

User · Answer

In modern browsers  this has become a lot easier  thanks to the URLSearchParams interface  This defines a host of utility methods to work with the query string of a URL   Assuming that our URL is https   example com  product shirt amp color blue amp newuser amp size m  you can grab the query string using window location search   const queryString   window location search  console log queryString       product shirt amp color blue amp newuser amp size m   You can then parse the query string   s parameters using URLSearchParams   const urlParams   new URLSearchParams queryString     Then you can call any of its methods on the result   For example  URLSearchParams get   will return the first value associated with the given search parameter   const product   urlParams get  product   console log product      shirt  const color   urlParams get  color   console log color      blue  const newUser   urlParams get  newuser   console log newUser      empty string   You can use URLSearchParams has   to check whether a certain parameter exists   console log urlParams has  product        true  console log urlParams has  paymentmethod        false   For further reading please click here

User · Answer

I ve used this library before which does a pretty good job of what you re after  Specifically -  qs contains name      Returns true if the querystring has a parameter name  else false       if  qs2 contains  name1     alert qs2 get  name1

User · Answer

You could also use a regular expression       amp  q   test location search

[javascript] How to check if a query string value is present via JavaScript?

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