pass array and individual string to php file using ajax call

Question

I try to implement the following code

 var flag = new Array();
 var name = $("#myselectedset").val();      
$.ajax({
    type:         'post',
    cache:         false,
    url:          'moveto.php',
    data:     {'myselectset' : name,
              'my_flag' : flag
              },
    success: function(msg){
                     $("#statusafter").ajaxComplete(function(){$(this).fadeIn("slow").html(msg)});
                      }     
          });

You can see that the name is a single string and the flag is an arry, am I using the right format for passing them throw ajax call, anyone could help me, thanks

Madara's Ghost · Accepted Answer · 2011-10-18 18:29:04Z

1

It is impossible to pass arrays in a POST request. Only strings.

You will either need to stringify your array, or consider posting as JSON instead.

answered Oct 18, 2011 at 18:29

Madara's Ghost

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3 Comments

Jordan Running Over a year ago

@Truth While your second sentence is good advice your first sentence is misleading if not outright false. Most web development platforms, including PHP, will interpret POST-data in the form arr[]=foo&arr[]=bar&arr[]=baz as an array value named arr with length 3.

smith Over a year ago

so can I do this: data: 'myselectset'+name+'&my_flag[]='+flag?

Madara's Ghost Over a year ago

@Jordan what I mean is that you can't pass arrays, JavaScript arrays, in a post request, you can send what you wrote in the form of a string, and PHP will interpret it as an array. But not the other way around.

LetterEh · Accepted Answer · 2011-10-18 20:03:01Z

0

You should be able to do something quite simple, like replace your "data" property with:

data : JSON.stringify( { myselectset : name, my_flag : flag } )

That will convert the data into a JSON string that you can turn into PHP on the other side, using json_decode($_POST["my_flag"]);

Very important note:

For JSON.stringify to work, there can't be any functions in the array - not even functions that are object methods.

Also, because this is a quick example, make sure that you're testing for null data and all of the rest of the best-practices.

answered Oct 18, 2011 at 20:03

LetterEh

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