javascript get a function s variable s value within another function

Question

okay so I have this code in body    lt input type  text  value  haha  id  full name   gt    And this code in script   lt script language  javascript  type  text javascript  gt      function first            var nameContent document getElementById  full name   value             function second             first            y nameContent           alert y             second     lt  script gt    I want a alert showing the value of the element full name  but it doesn t seem to work  does anyone know why   S

User · Answer

the OOP way to do this in ES5 is to make that variable into a property using the this keyword   function first        this nameContent document getElementById  full name   value     function second         y new first        alert y nameContent

User · Answer

nameContent only exists within the first   function  as you defined it within the first   function   To make its scope broader  define it outside of the functions   var nameContent   function first        nameContent document getElementById  full name   value     function second         first        y nameContent  alert y     second      A slightly better approach would be to return the value  as global variables get messy very quickly   function getFullName       return document getElementById  full name   value     function doStuff       var name   getFullName       alert name      doStuff

User · Answer

you need a return statement in your first function   function first        var nameContent   document getElementById  full name   value      return nameContent      and then in your second function can be   function second        alert first

User · Answer

Your nameContent variable is inside the function scope and not visible outside that function so if you want to use the nameContent outside of the function then declare it global inside the  lt script gt  tag and use inside functions without the var keyword as follows   lt script language  javascript  type  text javascript  gt      var nameContent     In the global scope     function first            nameContent document getElementById  full name   value             function second             first            y nameContent           alert y             second     lt  script gt

User · Answer

Your nameContent scope is only inside first function  You ll never get it s value that way   var nameContent     now it s global  function first        nameContent   document getElementById  full name   value     function second         first         y nameContent       alert y     second

[javascript] javascript: get a function's variable's value within another function

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