About take a variable from a array widget.

[maybeg...@gmail.com]

Hi.

How can I express the first element of a array widget in JavaScript?

For example, if my array id is: "id_array", and the variable of the array is "array"..

Thanks

[maybeg...@gmail.com]

For example.

The column name is "User", How can I the first element of this column or the second element in javascript?.

[Sabine El Rassy]

Hello, 

Let's say you have a widget array: 'id_array' with its variable 'variable_array'. Your array contains 1 column having 'array_column' as a name of variable.

In order to get the value of the first element in of the column 'array_column' of your array, you need to do as follow:

JSON.parse(RMPApplication.get("variable_array.array_column"))[0]

If you need the whole first row, you need to transpose the value of 

JSON.parse(RMPApplication.get("variable_array")) as the result within the array is by column and not by line.

Hope this was helpful,

Regards,

Sabine EL RASSY

[maybeg...@gmail.com]

Thank you so much Sabine!!!

One more thing,
Using:
JSON.parse(RMPApplication.get("variable_array"))

how could I create a pre launch script that compare all elements of the first column and if it finds a repeated element of the column, it shows a message like "I'm afraid that you have created a repeated one"

I appreciate it.

[thoshino]

Hi,

I found a Javascript in Stackoverflow  that might help you.

http://stackoverflow.com/questions/840781/easiest-way-to-find-duplicate-values-in-a-javascript-array

function find_duplicates(arr) {

  var len=arr.length,

      out=[],

      counts={};

  for (var i=0;i<len;i++) {

    var item = arr[i];

    var count = counts[item];

    counts[item] = counts[item] >= 1 ? counts[item] + 1 : 1;

  }

  for (var item in counts) {

    if(counts[item] > 1)

      out.push(item);

  }

  return out;

}

This function will return values that are duplicate.

So, in your pre-launch script, you can do something like this:

/*copy&paste the function above */

var user_duplicate = find_duplicates([[array.user]]);

if(user_duplicate == ""){

true;

}else {alert("your message")

};

You can even tell which users are duplicate in your alert like this:

alert("Error: following users are selected multiple times - " + user_duplicate);

In above example, array is the array variable, and user is the column variable. 

FYI: JSON.parse() that Sabine explained is incorporated in the JS function from Stackoverflow by multiple if's and for's. 

You can see how JSON.parse() is helpful and convenient - no need for that logic. This is the recommended way if you are dealing with data with your own code.

Best regards,

Taka

[maybeg...@gmail.com]

It works!!!

Thanks so much!
I'm so glad you could help me, a very detailed answer.

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