How can I view array structure in JavaScript with alert

Question

How can I view the structure of an array in JavaScript using alert

User · Answer

You can use alert arrayObj toSource

User · Answer

If what you want is to show with an alert   the content of an array of objects  i recomend you to define in the object the method toString   so with a simple alert MyArray   the full content of the array will be shown in the alert   Here is an example     -------------------------------------------------------------------    Defininf the Point object function Point CoordenadaX  CoordenadaY           Sets the point coordinates depending on the parameters defined     switch  arguments length            case 0              this x   null              this y   null              break          case 1              this x   CoordenadaX              this y   null              break          case 2              this x   CoordenadaX              this y   CoordenadaY              break               This adds the toString Method to the point object so the         point can be printed using alert        this toString   function             return        this x         this y                     Then if you have an array of points   var MyArray       MyArray push   new Point 5 6     MyArray push   new Point 7 9       You can print simply calling   alert MyArray     Hope this helps

User · Answer

Better use Firebug  chrome console etc  and use console dir

User · Answer

For readability purposes you can use      alert JSON stringify someArrayOrObj      2      More about JSON stringify     Example   let user       name   John     age  30    roles        isAdmin  false      isEditor  true         alert JSON stringify user      2       Result       name    John      age   30     roles          isAdmin   false       isEditor   true

User · Answer

A very basic approach is alert arrayObj join   n     which will display each array element in a row

User · Answer

EDIT  Firefox and Google Chrome now have a built-in JSON object  so you can just say alert JSON stringify myArray   without needing to use a jQuery plugin   This is not part of the Javascript language spec  so you shouldn t rely on the JSON object being present in all browsers  but for debugging purposes it s incredibly useful   I tend to use the jQuery-json plugin as follows   alert    toJSON myArray       This prints the array in a format like   5  6  7  11    However  for debugging your Javascript code  I highly recommend Firebug  It actually comes with a Javascript console  so you can type out Javascript code for any page and see the results   Things like arrays are already printed in the human-readable form used above   Firebug also has a debugger  as well as screens for helping you view and debug your HTML and CSS

User · Answer

If this is for debugging purposes  I would advise you use a JavaScript debugger such as Firebug  It will let you view the entire contents of arrays and much more  including modifying array entries and stepping through code

User · Answer

alert     form id   serialize

User · Answer

pass  your js array to the function below and it will do the same as php print r   function   alert print r your array       call it like this  function print r arr level    var dumped text       if  level  level   0     The padding given at the beginning of the line  var level padding       for var j 0 j lt level 1 j    level padding             if typeof arr      object       Array Hashes Objects      for var item in arr            var value   arr item            if typeof value      object       If it is an array              dumped text    level padding         item          n               dumped text    print r value level 1             else               dumped text    level padding         item        gt        value       n                     else     Stings Chars Numbers etc      dumped text        gt   arr   lt       typeof arr         return dumped text

User · Answer

I d recommend using toString     Ex  alert array toString     or console log array toString

User · Answer

You could write a function that will convert and format this array as string  Even better  use FireBug for debugging instead of alerts

[javascript] How can I view array structure in JavaScript with alert()?

Examples related to javascript