角度textarea计数行

Question

我有一个textarea，我想计算每行的行和价格，然后将数量添加到Stripe结帐。

<textarea id="textarea-1" rows="15" maxlenght="540" placeholder="Type or paste text here">
</textarea> 

输入

Hello World! 

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam
condimentum metus eget facilisis convallis. Nam facilisis magna quis
pretium ultricies.

脚本中的计数/输出

Hello World!

Lorem ipsum dolor sit amet, cons
ectetur adipiscing elit. Aliquam
condimentum metus eget facilisis
convallis. Nam facilisis magnaqu
is pretium ultricies.

行数应为7。

var flatFee = '70.00';
var perRow = '10.00';

function rowController() {

  //Textarea as string
  var text = document.getElementById("textarea").value;

  //Split string into array with 32 characters in each
  var rowSplit = text.val().split("\n", 32);
    //Count arrays (7)
    console.log(rowSplit.length);
}
  //Take string array
  var rows = rowSplit.length(this.value);

  //Counted arrays and add value
  var additionalFees=0;
    if (count.rows > 2) {
      additionalFees = perRow * (count.rows - 2);
  } 

  var amount = parseFloat(flatFee) + parseFloat(additionalFees);

  console.log(amount);

最终金额应该能够放入条带变量。无论如何，这是一般的想法。控制台可以查看它是否重要。

非常感谢帮助。