JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<div class="row">
<h2>Input Prefix plugin</h2>
  <div class="col-sm-offset-2 col-sm-8 form-inline">
    <input type="text" data-prefix="任意の接頭語：" class="form-control"/> 
    
  </div>
</div>

CSS

body{width:80%;margin:auto;}
h2{font-size:16px;margin-bottom:20px;}

JavaScript

/*!
 * Input Prefix plugin for jQuery, by Grégoire Fruleux
 * Copyright 2016 Salto Consulting
 * Licensed under https://opensource.org/licenses/GPL-3.0
 * Source https://github.com/gfruleux/jquery-plugin-input-prefix
 */

+function ($) {
	'use strict';
	
	// INPUTPREFIX CLASS DEFINITION
	// ============================
	var Inputprefix = function (element) {
		this.$element = $(element);
		
		this.prefix          = undefined;
		this.prefixLen       = undefined;
		this.cursorStart     = undefined;
		this.cursorEnd       = undefined;
		this.currentValue    = undefined;
		this.currentValueLen = undefined;
		
		this.setCurrentInfos(this.$element);
		this.$element.val(this.prefix);
		
		this.$element.on("keydown", $.proxy(this.preInputDataPrefixKeydown, this));
		this.$element.on("input", $.proxy(this.preInputDataPrefixChange, this));
	}
	
	Inputprefix.version = "0.0.1";
	
	// INPUTPREFIX TARGET FUNCTIONS
	// ============================
	
	Inputprefix.prototype.setCurrentInfos = function ($target) {
		this.prefix = $target.data("prefix");
		this.prefixLen = this.prefix.length;
		this.cursorStart = $target.get(0).selectionStart;
		this.cursorEnd = $target.get(0).selectionEnd;
		this.currentValue = $target.val();
		this.currentValueLen = this.currentValue.length;
		
		if (this.currentValueLen === undefined || this.currentValueLen === 0)
			$target.val(this.prefix);
	}
	
	Inputprefix.prototype.setTargetSelection = function ($target, value) {
		$target[0].selectionStart = $target[0].selectionEnd = value; 
	}
	
	// INPUTPREFIX KEYDOWN PREPROCESSOR-FUNCTION
	// =========================================
	Inputprefix.prototype.preInputDataPrefixKeydown = function (event) {
		var keyCode = event.which;
		this.setCurrentInfos(this.$element);
		if (keyCode === 8 || keyCode === 46) {
			event.preventDefault();
			this.inputDataPrefixKeydown(event);
		}
	};
	
	// INPUTPREFIX KEYDOWN FUNCTION
	// ============================
	Inputprefix.prototype.inputDataPrefixKeydown = function...