JavaScript String Multiline Trim/Cleanup

These small JavaScript prototypes enhance the trim() function and allow for better trimming and/or replacing line breaks with commas (or any other character).

JavaScript

/*
 * Prototype function to remove all double whitespaces and preceding line breaks
 */
String.prototype.allTrim = String.prototype.allTrim || function() {
    return this
            .replace(/  +/g, ' ')
            .replace(/\n\s*\n/g, '\n')
            .replace(/(\r\n|\n|\r)/gm, '') // Remove all 3 types of line breaks
            .replace(/^,+/, '')
            .replace(', ,', ',')
            .trim();
};

/*
 * Prototype function to replace all line breaks with commas
 */
String.prototype.allCommas = String.prototype.allCommas || function() {
    return this
            .replace(/(\r\n|\n|\r)/gm, ', ')
            .allTrim()
            .trim();
};

Usage

// JavaScript
document.getElementById('myElement').innerText.allTrim();
document.getElementById('myElement').innerText.allCommas();

Find more JavaScript tutorials, code snippets and samples here.

Ciprian on Friday, September 15, 2017 in Methods, Events and Scopes | Last modified on Wednesday, April 30, 2025

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