Usage with UpCart

Third-party cart solutions like UpCart operate independently from your theme code, requiring JavaScript-based approaches for customization. This guide outlines how to implement custom cart features with UpCart.

Understanding the Challenge

UpCart renders content independently from your theme, making direct modification impossible through traditional methods. JavaScript techniques allow you to integrate custom behaviors without modifying UpCart's core code.

Implementation Strategy

Initial Setup

Create a script that initializes when the page loads:

window.addEventListener('load', function(){
  // Initialize modifications
  updateCartFeatures()
})

Core Update Function

Build an asynchronous function to handle cart modifications:

async function updateCartFeatures(){
  // Check cart conditions
  let specialItemsCount = await window.trynow.cart.getTryNowItemCount()
  
  if(specialItemsCount > 0){
    // Apply custom modifications
    modifyPrices()
    updateCheckoutButton()
    adjustVisibility()
  } else {
    // Reset to default state
    resetCartElements()
  }
}

Event Integration

Leverage UpCart's event hooks:

// Cart contents change
window.upcartOnCartUpdated = () => {
  setTimeout(updateCartFeatures, 500)
}

// New items added
window.upcartOnAddToCart = () => {
  let upCart = document.querySelector('#UpcartPopup')
  
  if(!upCart.classList.contains('upcartPopupShow')){
    upcartRefreshCart()
    upcartOpenCart()
  }
}

Common Customizations

Price Modifications

function modifyPrices() {
  let cartItems = document.querySelectorAll('.upcart-product-item')
  cartItems.forEach(item => {
    let itemProperty = item.querySelector('.upcart-item-property')
    
    if(itemProperty && itemProperty.textContent.includes('Your Identifier')){
      item.querySelector('.upcart-item-price span').textContent = '$0.00'
    }
  })
}

Checkout Button Customization

async function updateCheckoutButton() {
  let modifiedAmount = await yourAPI.cart.getModifiedAmount()
  let checkoutButton = document.querySelector('.upcart-checkout-button .money')
  checkoutButton.textContent = modifiedAmount
}

Element Visibility

function adjustVisibility() {
  let elements = {
    badge: document.querySelector('.upcart-trust-badge'),
    subtotal: document.querySelector('.upcart-subtotal')
  }
  
  elements.badge.style.display = 'none'
  // Other visibility adjustments
}

Implementation Example

A complete implementation might look like this:

window.addEventListener('load', function(){
  async function updateCartFeatures(){
    let specialItemsCount = await window.trynow.cart.getTryNowItemCount()
    let upCartBadge = document.querySelector('.upcart-trust-badge')

    if(specialItemsCount > 0){
      let cartItems = document.querySelectorAll('.upcart-product-item')
      cartItems.forEach(item => {
        let itemProperty = item.querySelector('.upcart-item-property')
        if(itemProperty && itemProperty.textContent.includes('Your Identifier')){
          item.querySelector('.upcart-item-price span').textContent = '$0.00'
        }
      })

      let modifiedAmount = await yourAPI.cart.getModifiedAmount()
      let checkoutText = document.querySelector('.upcart-checkout-button .money')
      checkoutText.textContent = modifiedAmount

      upCartBadge.style.display = 'none'
    } else {
      upCartBadge.style.display = 'block'
    }
  }

  window.upcartOnCartUpdated = () => {
    setTimeout(updateCartFeatures, 500)
  }

  window.upcartOnAddToCart = () => {
    let upCart = document.querySelector('#UpcartPopup')
    if(!upCart.classList.contains('upcartPopupShow')){
      upcartRefreshCart()
      upcartOpenCart()
    }
  }

  updateCartFeatures()
})

Remember to adjust selectors based on your specific UpCart implementation and replace placeholder API calls with your actual integration code.