How can I do array to assign another array and trim?

Question

I have textarea and textare jsccode as the following :

var checkName = (document.getElementById("List").value);
var tempcheckNames = checkName.split('\n');

and assign array another array with trim.

for (var i = 0; i < tempcheckNames.length;i++){
    checkNames = tempcheckNames[i].trim().split('\n');
}

But checkNames is empty because assign with not array ?

So I want to trim from textarea value (I did textarea value split so my array is textarea value ('\n')

Should checkNames be a string, an array, or an array of arrays? — guest271314
– guest271314, Commented Jun 28, 2016 at 6:16
Just try checkName.split('\n').map(function(item){ return item.trim(); }) — Rajesh Dixit
– Rajesh Dixit, Commented Jun 28, 2016 at 6:20

kevin ternet · Accepted Answer · 2016-06-28 10:06:28Z

1

This way, that's shorter

var checkName = document.getElementById("List").value.split("\n").map(element => element.trim());

answered Jun 28, 2016 at 10:06

kevin ternet

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1 Comment

eagle Over a year ago

Yeap. that's it !!

guest271314 · Accepted Answer · 2016-06-28 06:20:47Z

1

Define checkNames as an array, use .push() to add items to checkNames array within for loop, remove call to .split() within for loop

for (var i = 0, checkNames = [] /* define `checkNames` as an array */
    ; i < tempcheckNames.length
    ; i++) {
    checkNames.push(tempcheckNames[i].trim()); 
    // .split('\n'); `.split()` not needed here
}

answered Jun 28, 2016 at 6:20

guest271314

1

1 Comment

eagle Over a year ago

Thank you very much @guest271314

Aditya Singh · Accepted Answer · 2016-06-28 08:03:19Z

1

You can push the values to an array to get all the split values

var btn = document.getElementById('btn-show');
btn.addEventListener('click', btnShow);

function btnShow (e) {
  var checkName = (document.getElementById("list").value);
  var tempcheckNames = checkName.split('\n');
  var checkNames = [];
  
  for (var i = 0; i < tempcheckNames.length;i++){
    checkNames.push(tempcheckNames[i].trim());
  }
  alert(checkNames);
}

<textarea id='list'> </textarea>

<button id='btn-show'>Show</button>

Functional approach using Array.map

var btn = document.getElementById('btn-show');
btn.addEventListener('click', btnShow);

function btnShow (e) {
  var checkName = (document.getElementById("list").value);

  const checkNames = checkName.split('\n').map((name) => name.trim() );
  
  alert(checkNames);
}

    <textarea id='list'> </textarea>

    <button id='btn-show'>Show</button>

edited Jun 28, 2016 at 8:03

answered Jun 28, 2016 at 6:23

Aditya Singh

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2 Comments

guest271314 Over a year ago

What is purpose of calling .split('\n') within for loop?

eagle Over a year ago

than you very much.

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