CODEWITHSUNDEEP
javascripttexttextareaenter
CKH
CKH

Reputation: 133

Javascript to count number of texts within textarea by "enter"

could you please inform how the number of texts can be counted within textarea by pressing "enter".

Textarea can be created like this:

 <textarea name="ta1" id="ta1" rows="4" cols="50">
 ABC[enter]
 DEF[enter]
 GHI[enter]
 </textarea>
 <input type="text" name="textnumber" value="">

Then "textnumber" will show "3" instantaneously. Thanks.

Upvotes: 0

Views: 1352

Answers (3)

Den Kison
Den Kison

Reputation: 1084

Try do that in this way

function getEntersCount(textarea, result) {
   var text = textarea.value,
       enters = text.split(/\r|\r\n|\n/),
       count = enters.length;

   result.value = count;
}

getEntersCount(
    document.getElementById("ta1"), 
    document.querySelector('[name="textnumber"]')
);

Guess this will help you

EDIT 1

getEntersCount(
    document.getElementById("ta1"), 
    document.getElementById('textnumber')
);

EDIT 2

// Function will take text and return count of lines in it
function getEntersCount(text) {
    var enters = text.split(/\r|\r\n|\n/),
        count = enters.length;       
    return count;
}

// Usage example
var count = getEntersCount(document.getElementById("ta1").value) 
console.log(count);

Upvotes: 1

maioman
maioman

Reputation: 18744

To count the number of newlines in the textarea you have to :

  • get the value of textarea var val = document.querySelector('textarea').value

  • then count \n (newline) var res = val.match(/\n/g).length

To bind the result and have it visualized in your input you can wrap this process in a function to be called on every textarea update,

try this:

var tarea = document.querySelector('textarea')
var input = document.querySelector('input')

function update() {
  var res = (tarea.value.match(/\n/g)) ? tarea.value.match(/\n/g).length : 0;
  //                 ^^^^^^
  //          this is a ternary (like a conditional check)
  input.value = res;
}

tarea.addEventListener('input', update)
<textarea name="ta1" id="ta1" rows="4" cols="50">
  ABC DEF GHI
</textarea>
<input type="text" name="textnumber" value="0">

Upvotes: 0

Guy Waldman
Guy Waldman

Reputation: 467

This question has been asked before (see here).

You can use Regex to find the number of newlines in a string. The pattern to match is: /\n/g which means the number of occurances of a newline

See this.

Upvotes: 0

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