Dynamic Freeshipping Bar Shopify (Liquid, Javascript, CSS)

freeshipping-bar.css

.fsb {
  background-color: var(--bg-color);
  color: var(--color);
  font-size: 15px;
  height: 4em;
}

.fsb .fsb-progress {
  display: flex;
  padding: 1em;
  align-items: center;
  justify-content: center;
  text-align: center;
  height: 100%;
  position: relative;
}

.fsb .fsb-progress p {
  font-size: 1em;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0;
  position: relative;
  z-index: 2;
}

.fsb .fsb-progress p .fsb--number {
  color: var(--accent-color);
  font-weight: bold;
}

.fsb .fsb-progress::before {
  content: "";
  width: var(--progress);
  background-color: var(--progress-color);
  position: absolute;
  left: 0;
  height: 100%;
  transition: width 0.75s ease-in-out;
  z-index: 1;
}

freeshipping-bar.js

class Fsb {
    constructor(fsb = { selector: '#fsb', events: [], placeholder: '(x)' }) {
      if (fsb.selector && typeof fsb.selector == 'string' && fsb.selector !== '') {
        this.selector = fsb.selector;
      } else {
        throw new TypeError("Please pass a valid selector");
      }
      
      this.fsbElement = document.querySelector(this.selector);
      if(!this.fsbElement) {
        throw new TypeError("Freeshipping Bar Element Not Found");
      }
      
      this.events = fsb.events;
      this.placeholder = fsb.placeholder;
      
      this.goal = parseInt(this.fsbElement.dataset.goal);
      this.startHeadline = this.fsbElement.dataset.headlineStart;
      this.middleHeadline = this.fsbElement.dataset.headlineMiddle;
      this.endHeadline = this.fsbElement.dataset.headlineEnd;
    }
    
    getCart() {
      return fetch('/cart.js')
      .then(res=>res.json())
    }
  
    update(cart) {
      let shipping = {
        difference: this.goal - cart.total_price,
        progress: Math.round((cart.total_price * 100) / this.goal) 
      }
      
      if(cart.total_price <= 0) {
        this.fsbElement.style.setProperty('--progress', `${shipping.progress}%`);
        this.fsbElement.querySelector('.fsb-paragraph').innerHTML = this.startHeadline.replace(this.placeholder, `<span class="fsb--number">${this.formatMoney(this.goal)}</span>`);
      } else if(cart.total_price > 0 && cart.total_price < this.goal) {
        this.fsbElement.style.setProperty('--progress', `${shipping.progress}%`);
        this.fsbElement.querySelector('.fsb-paragraph').innerHTML = this.middleHeadline.replace(this.placeholder, `<span class="fsb--number">${this.formatMoney(shipping.difference)}</span>`);
      } else if(cart.total_price >= this.goal) {
        this.fsbElement.style.setProperty('--progress', `${shipping.progress}%`);
        this.fsbElement.querySelector('.fsb-paragraph').innerHTML = this.endHeadline.replace(this.placeholder, `<span class="fsb--number">${this.formatMoney(this.goal)}</span>`);
      } 
    }
    
    attachEvents() {
      if(this.events.length > 0) {
        this.events.forEach(event => {
          document.addEventListener(event, e => this.getCart().then(cart => this.update(cart)), true);
        })
      }
    }
  
    formatMoney(cents, format) {
      if (typeof cents == 'string') { cents = cents.replace('.',''); }
      var value = '';
      var placeholderRegex = /\{\{\s*(\w+)\s*\}\}/;
      var formatString = (format || "${{amount_no_decimals}}");
  
      function defaultOption(opt, def) {
        return (typeof opt == 'undefined' ? def : opt);
      }
  
      function formatWithDelimiters(number, precision, thousands, decimal) {
        precision = defaultOption(precision, 2);
        thousands = defaultOption(thousands, ',');
        decimal   = defaultOption(decimal, '.');
  
        if (isNaN(number) || number == null) { return 0; }
  
        number = (number/100.0).toFixed(precision);
  
        var parts   = number.split('.'),
            dollars = parts[0].replace(/(\d)(?=(\d\d\d)+(?!\d))/g, '$1' + thousands),
            cents   = parts[1] ? (decimal + parts[1]) : '';
  
        return dollars + cents;
      }
  
      switch(formatString.match(placeholderRegex)[1]) {
        case 'amount':
          value = formatWithDelimiters(cents, 2);
          break;
        case 'amount_no_decimals':
          value = formatWithDelimiters(cents, 0);
          break;
        case 'amount_with_comma_separator':
          value = formatWithDelimiters(cents, 2, '.', ',');
          break;
        case 'amount_no_decimals_with_comma_separator':
          value = formatWithDelimiters(cents, 0, '.', ',');
          break;
      }
  
      return formatString.replace(placeholderRegex, value);
    }
  }

freeshipping-bar.liquid

{% assign freeShipping = settings.fsb_goal | times: 100 %}
{% assign totalPrice = cart.total_price %}
{% assign shippingDifference = freeShipping | minus: totalPrice %}  
{% assign shippingDifferencePercentage = shippingDifference | divided_by: 100 %}
{% assign shippingProgress = totalPrice | times:100 | divided_by:freeShipping | append:'%' %}
{% assign initial_message = settings.fsb_headline_start %} 
{% assign middle_message = settings.fsb_headline_middle %}
{% assign end_message = settings.fsb_headline_end %}

{% assign shippingGoalWithCurrency = freeShipping | money_without_trailing_zeros | prepend:'<span class="fsb--number">'| append:'</span>' %}
{% assign shippingDifferenceWithCurrency = shippingDifference | money_without_trailing_zeros | prepend:'<span class="fsb--number">'| append:'</span>' %}

<div id="fsb" class="fsb" style="--bg-color: {{settings.fsb_background_color}};
                                    --progress-color: {{settings.fsb_progress_color}};
                                    --color: {{settings.fsb_text_color}};
                                    --accent-color: {{settings.fsb_accent_color}};
                                    --progress: {{shippingProgress}};
                                    "
     data-headline-start="{{settings.fsb_headline_start}}"
     data-headline-middle="{{settings.fsb_headline_middle}}"
     data-headline-end="{{settings.fsb_headline_end}}"
     data-goal="{{freeShipping}}">
  <div class="fsb-progress">
    {% if cart.total_price <= 0 %}
    <p class="fsb-paragraph">
      {{ initial_message | replace: "(x)",  shippingGoalWithCurrency }}
    </p>
    {% elsif cart.total_price > 0 and cart.total_price < freeShipping %}
    <p class="fsb-paragraph">
      {{ middle_message | replace: '(x)', shippingDifferenceWithCurrency }}	
    </p>
    {% elsif cart.total_price >= freeShipping %}
    <p class="fsb-paragraph">
      {{ end_message | replace: "(x)",  shippingGoalWithCurrency }}
    </p>
    {% endif %}
  </div>
</div>

schema-settings.json

{
  "name": "Freeshipping Bar",
  "settings": [
    {
      "type": "checkbox",
      "id": "fsb_enable",
      "label": "Enable/Disable Free Shipping Bar",
      "default": true
    },
    {
      "type": "checkbox",
      "id": "fsb_ajax",
      "label": "Enable/Disable Ajax Functionality",
      "default": true
    },
    {
      "type": "header",
      "content": "Goal"
    },
    {
      "type": "range",
      "id": "fsb_goal",
      "min": 1,
      "max": 100,
      "step": 1,
      "unit": "$",
      "label": "Goal",
      "default": 5
    },
    {
      "type": "header",
      "content": "Headline Steps"
    },
    {
      "type": "text",
      "id": "fsb_headline_start",
      "label": "Start Headline",
      "default": "If you add (x) worth of products to your cart, you'll get Freeshipping!",
      "info": "Use the special character '(x)' as a placeholder for the 'Goal' amount"
    },
    {
      "type": "text",
      "id": "fsb_headline_middle",
      "label": "Middle Headline",
      "default": "You are (x) away from Freeshipping!",
      "info": "Use the special character '(x)' as a placeholder for the 'Remaining' amount"
    },
    {
      "type": "text",
      "id": "fsb_headline_end",
      "label": "End Headline",
      "default": "You have Freeshipping!",
      "info": "Use the special character '(x)' as a placeholder for the 'Goal' amount"
    },
    {
      "type": "header",
      "content": "Colors"
    },
    {
      "type": "color",
      "id": "fsb_background_color",
      "label": "Background Color",
      "default": "#000000"
    },
    {
      "type": "color",
      "id": "fsb_progress_color",
      "label": "Progress Bar Color",
      "default": "#006fbb"
    },
    {
      "type": "color",
      "id": "fsb_text_color",
      "label": "Text Color",
      "default": "#FFFFFF"
    },
    {
      "type": "color",
      "id": "fsb_accent_color",
      "label": "Accent Color",
      "default": "#c03"
    }
  ]
}

theme.liquid

//ADD THIS BEFORE </head>
    {% if settings.fsb_enable %}
      
      {{ 'hc-freeshipping-bar.css' | asset_url | stylesheet_tag }}
    
      {% if settings.fsb_ajax %}
        {{ 'hc-freeshipping-bar.js' | asset_url | script_tag }}
        <script>
          document.addEventListener('DOMContentLoaded', function() {
            const freeshippingBar = new HCFsb({
              selector: '#hc-fsb', // Selector of the HTML template (Snippet)
              events: ['fsb:product:added', 'fsb:cart:update'], //Events used to update the FSB
              placeholder: '(x)' //Placeholder character to replace the goal/remaining amount in the FSB headline
            });
            freeshippingBar.attachEvents();
          });
        </script>
      {% endif %}
    
    {% endif %}

//ADD THIS WHEREVER YOU WANT THE FSB TO APPEAR
    {% if settings.fsb_enable %}
    	{% render 'hc-freeshipping-bar' %}
    {% endif %}

Hi the Json script can't be saved, How can i do pls ?