JSFiddle - React, Tailwind, and code Playground

HTML

<body>
<div id="postText">
тестовая строчка простая<br>
тестовая строчка простая<br>
тестовая строчка простая<br>
тестовая строчка простая<br>

</div>

<!--блок первого динамического поля-->
<div style=" display: block; width: 470px;position:static;">
                <div style="padding-top: 5px;">
                    <input type="text" class="form-control" name = "nameInformation[]" id="prizName" placeholder="Приз">
                </div>
                    <div class="information_json_plus">
                        <div>
                            <span style="float: right; margin-bottom: 20px;" class="btn btn-success plus pull-right">+</span>
                        </div>
                    </div>



            </div>
            
          
         
</body>

CSS

/* общий стиль */
    input[type="checkbox"]{zoom:1.5; }
    .hr{border-bottom: 1px solid #000}
    .block{ width: 450px; padding: 10px; border: 1px solid #000;float: right; }
    .information_json * {
        -webkit-box-sizing: border-box;
        -moz-box-sizing: border-box;
        box-sizing: border-box;
    }
    /* стиль динамических полей*/
    .pull-right {float: left;}
    .form-control {
        display: block;
        width: 100%;
        height: 34px;
        padding: 6px 12px;
        font-size: 14px;
        line-height: 1.42857143;
        color: #555;
        background-color: #fff;
        background-image: none;
        border: 1px solid #ccc;
        border-radius: 4px;
        -webkit-box-shadow: inset 0 1px 1px rgba(0,0,0,.075);
        box-shadow: inset 0 1px 1px rgba(0,0,0,.075);
        -webkit-transition: border-color ease-in-out .15s,-webkit-box-shadow ease-in-out .15s;
        -o-transition: border-color ease-in-out .15s,box-shadow ease-in-out .15s;
        transition: border-color ease-in-out .15s,box-shadow ease-in-out .15s;
    }
    .btn {
        display: inline-block;
        padding: 6px 12px;
        margin-bottom: 0;
        font-size: 14px;
        font-weight: 400;
        line-height: 1.42857143;
        text-align: center;
        white-space: nowrap;
        vertical-align: middle;
        -ms-touch-action: manipulation;
        touch-action: manipulation;
        cursor: pointer;
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
        background-image: none;
        border: 1px solid transparent;
        border-radius: 4px;
    }
    .btn-danger {
        color: #fff;
        background-color: #d9534f;
        border-color: #d43f3a;
    }
    .btn-success {
        color: #fff;
        background-color: #5cb85c;
        border-color: #4cae4c;
    }

JavaScript

// формируем новые поля
    jQuery('.plus').click(function(){
        jQuery('.information_json_plus').before(
            '<div><input style="width: 430px; float: left; margin-top: 5px;" type="text" class="form-control" name = "nameInformation[]" id="prizName" placeholder="Приз">' +
            '<span class="btn btn-danger minus pull-right" style="float: right; margin-top: 5px;">&ndash;</span></div>'

        );
    });
    // on - так как элемент динамически создан и обычный обработчик с ним не работает
    jQuery(document).on('click', '.minus', function(){
        jQuery( this ).closest( 'div' ).remove(); // удаление строки с полями
    });

  
    
    
    var inputFocused;
    var inputFocusedNotTrueText;
    var inputFocusedDate;
    
    $('div').on('focus', '#prizName',function() {

        inputFocused = $(this);
        inputFocusedNotTrueText=null;
        inputFocusedDate = null;

    });

    $('#phone, #adress').on('focus', function() {

        inputFocusedNotTrueText = $(this);
        inputFocused=null;
        inputFocusedDate = null;
    });

    $('div').on('focus', '#oneDate',function() {
        inputFocusedDate = $(this);
        inputFocused=null;
        inputFocusedNotTrueText=null;
    });
    
$('#postText').on('mouseup', function(e) {

        if (inputFocused == null && !inputFocusedNotTrueText == null && !inputFocusedDate == null) {
            return false;
        }

        if (inputFocused != null) {
     
               if (e.ctrlKey === true) {
                    inputFocused.val(getTrueText(getSelectedText()));

                } else if (e.altKey === true) {
                    inputFocused.val(getTrueText(inputFocused.val() + ", " + getSelectedText()));
                }
                else {
                    inputFocused.val(getTrueText(inputFocused.val() + " " + getSelectedText()));
                }
            


        }
        if (inputFocusedNotTrueText != null) {
         
               ...