How to check whether a Storage item is set

Question

How can I check if an item is set in localStorage  Currently I am using  if    localStorage getItem  infiniteScrollEnabled      true    localStorage getItem  infiniteScrollEnabled      false            init variable set default variable for item     localStorage setItem  infiniteScrollEnabled   true

User · Answer

You can also try this if you want to check for undefined   if  localStorage user     undefined        localStorage user    username       getItem is a method which returns null if value is not found

User · Answer

localStorage  root2   null   localStorage getItem  root2       null   false   Maybe better to do a scan of the plan      localStorage  root1   187  187  root1  in localStorage true

User · Answer

You should check for the type of the item in the localStorage  if localStorage token     null          this will only work if the token is set in the localStorage    if typeof localStorage token      undefined          do something with token    if typeof localStorage token      undefined          token doesn t exist in the localStorage  maybe set it

User · Answer

easist way is  if localStorage test   console log  now defined      else  console log  undefined    localStorage test  defined       How it works   when you call localStorage test first time it does not contain  any store into localStorage object so it returns undefined else condition triggers  after else triggered i set new variable and again check it contains data so it return data with true in if condition

User · Answer

Try this code   if  localStorage getItem  infiniteScrollEnabled       null       else

User · Answer

For TRUE  localStorage infiniteScrollEnabled   1    FOR FALSE  localStorage removeItem  infiniteScrollEnabled     CHECK EXISTANCE  if  localStorage   infiniteScrollEnabled           CODE IF ENABLED

User · Answer

The shortest way is to use default value  if key is not in storage   var sValue   localStorage  my token             for strings    var iValue   localStorage  my token      0     for integers

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I ve used in my project and works perfectly for me   var returnObjName  JSON parse localStorage getItem  ObjName     if returnObjName  amp  amp  Object keys returnObjName  length  gt  0        Exist data in local storage  else      Non Exist data block

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if  localStorage hash  localStorage hash    thinkdj     Or  var secret    localStorage hash    42

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The getItem method in the WebStorage specification  explicitly returns null if the item does not exist          If the given key does not exist in the list associated with the object then this method must return null        So  you can   if  localStorage getItem  infiniteScrollEnabled       null                See this related question    Storing Objects in HTML5 localStorage

User · Answer

You can use hasOwnProperty method to check this   gt  localStorage setItem  foo   123  undefined  gt  localStorage hasOwnProperty  foo   true  gt  localStorage hasOwnProperty  bar   false   Works in current versions of Chrome Mac   Firefox Mac  and Safari

User · Answer

How can one test existence of an item in localStorage  this method works in internet explorer    lt script gt      try          localStorage getItem  username         catch e           alert  we are in catch   e print          lt  script gt

User · Answer

Best and Safest way i can suggest is this    if Object prototype hasOwnProperty call localStorage   infiniteScrollEnabled            init variable set default variable for item     localStorage setItem  infiniteScrollEnabled   true       This passes through ESLint s no-prototype-builtins rule

[javascript] How to check whether a Storage item is set?

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