What is the best way to format a string into a specific pattern within an Angular application

In my Angular component, I have 4 fields: customerName, startDate, and startTime. Additionally, I have a fourth field that is a textarea where the user can see the message that will be sent via email or SMS. Within my component, I have defined a string as follows:

emailContent = 'Hi [customer_name],↵↵Your appointment has been scheduled for [start_date] at [start_time]'

Upon loading the component, I generate a message by replacing all text within the square brackets [] with the respective values of the input fields. For example, [customer_name] is replaced with the value of customerName, and so on. The resulting template looks like this:

Hi John Doe,

Your appointment has been scheduled for 30-Mar-20 at 03:00 pm.  
Please confirm your appointment.

This template is visible in a textarea field, allowing the user to view and modify the text. If the user adds additional text in the textarea like this:

Hi John Doe,

Your appointment has been scheduled for 30-Mar-20 at 03:00 pm.  
Please confirm your appointment. Please be on time there

The added text ("Please be on time there") needs to be parsed back into the tags format, like so:

'Hi [customer_name],↵↵Your appointment has been scheduled for [start_date] at [start_time]. Please be on time there'

I am looking for a way to extract that additional text entered by the user in the textarea in Angular.

javascriptangulartypescript

Answer №1

Here is a simple method to find the differences between two strings. You have the option to customize the difference calculator as needed.

function getDifferences(str1, str2) {
  let differences = "";
    
  const str1Array = str1.split(/\n/);
  str2.split(/\n/).some((line, index) => {
    const originalLine = str1Array[index].trim();
    const modifiedLine = line.trim();
    if (modifiedLine !== originalLine) {
      differences =
        originalLine.length > modifiedLine
          ? originalLine.replace(modifiedLine, "")
          : modifiedLine.replace(originalLine, "");
      return false;
    }
  });

  return differences;
}

const text1 = "Hello World!";
const text2 = "Hi World!";

const result = getDifferences(text1, text2);

console.log(result);

Answer №2

Template literals are the way to go in typescript when it comes to string formatting. Forget about using single quotes, just switch to backticks instead. With this method, printing variables is a piece of cake:

`Hey ${customer_name},

Your appointment is set for ${start_date} at ${start_time}. Please arrive promptly`

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