check null empty or undefined angularjs

Question

I am creating a project using angularjs I have variable like   scope test   null  scope test   undefined  scope test        I want to check all null undefined and empty value in one condition

User · Answer

You can do  if  scope test    null     scope test               null    undefined     if false  0 and NaN can also be considered as false values you can just do   if  scope test      not any of the above

User · Answer

A very simple check that you can do   Explanation 1   if  value        it will come inside     If value is either undefined  null or    empty string      Explanation 2     value     Case 1     Case 2    If the value is either undefined   null or    then Case 1   otherwise for any other value of value Case 2

User · Answer

You can use angular s function called angular isUndefined value  returns boolean   You may read more about angular s functions here  AngularJS Functions  isUndefined

User · Answer

You can do simple check    if  a          do something when  a  is not undefined  null

User · Answer

just use -   if  a     if a is negative undefined null empty value then             do whatever   else          do whatever     this works because of the    difference from     in javascript  which converts some values to  equal  values in other types to check for equality  as opposed for     which simply checks if the values equal  so basically the    operator know to convert the     null  undefined to a false value  which is exactly what you need

User · Answer

You can also do a simple check using function    scope isNullOrEmptyOrUndefined   function  value        return  value

User · Answer

if  scope test    null     scope test    undefined     scope test              scope test lenght    0    console log  test is not defined      else  console log  test is defined    scope test

[angularjs] check null,empty or undefined angularjs

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