Efficiently replacing the new line character with a comma within an Angular application

One of the fields in my form allows users to input data either on a new line or separated by commas. However, when this data is sent via an API, a newline character (/n) is added for each new line which I do not want to display on the detail page. Here is an example of user input:

Example 1

ABC

red

test,blue

Example 2

abc,blue,

green,red

test

I need to ensure that any new line breaks are replaced with commas and existing commas are left unchanged.

Desired output:

Example 1

ABC,red,test,blue

Example 2

abc,blue,green,red,test

Here is the relevant code snippet:

createData(data) {
    const Obj = {};   
    if (data.enum && data.value_type === 'Enum') {
        Obj['values'] = data.enum.split(',');
    }    
    console.log(Obj,"constraint");
    return Obj;
}

Answer №1

To start, split the string using a newline character. Remove any empty strings from the resulting array and then join them with a ,. Be mindful of instances where there are double commas in the string.

var str = `ABC

red

test,blue`;

var str2 = `abc,blue,

green,red

test`;
formatString(str);
formatString(str2);

function formatString(str) {

  var strArray = str.split("\n");
  strArray = strArray.filter((item) => {
    return item !== '';
  });
  console.log(strArray.join(",").split(",,,").join(","));
}

Answer №2

Utilizing regex with the split() method

Check out the Regex Demo here

We have two strings:
    const str1 = `ABC
    
    red
    
    test,blue`;
    
    const str2 = `abc,blue,
    
    green,red
    
    test`;
    
    console.log(str1.split(/[,\n]+\s+/g).join(','))
    console.log(str2.split(/[,\n]+\s+/g).join(','))

Answer №3

A different strategy involves capturing user input each time a character is entered. This allows you to avoid repeatedly parsing the entire text with each keystroke, which can include unnecessary processing.

Below is a straightforward code snippet that dynamically replaces newlines and spaces with commas as the user types. Just make sure you have a textarea element with the ID textArea in your HTML document.

const textArea = document.getElementById('textArea');

const parseText = function parseText(e) {

  if (e.keyCode === 13 || e.keyCode === 32) {
  
    e && e.preventDefault();
    
    let text = textArea.value;
    let curStart = textArea.selectionStart;
    let curEnd = textArea.selectionEnd;

    if (curStart == text.length && curEnd == text.length && !text.endsWith(',')) {
      text += ',';
      textArea.value = text;
    }

  }


}

textArea.addEventListener('keydown', parseText);

Best regards

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