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<label for="description">Donation To Solve Problem </label><input type="text" name="descriptionInput" id="description" maxlength="127" value="">
<label for="amount">Amount </label><input name="amountInput" type="number" id="amount" value="" > USD
 <script src="https://www.paypal.com/sdk/js?client-id=sb&enable-funding=venmo&currency=USD" data-sdk-integration-source="button-factory"></script>
 <script>
 function initPayPalButton() {
   var description = document.querySelector('#smart-button-container #description');
   var amount = document.querySelector('#smart-button-container #amount');
   var descriptionError = document.querySelector('#smart-button-container #descriptionError');
   var priceError = document.querySelector('#smart-button-container #priceLabelError');
   var invoiceid = document.querySelector('#smart-button-container #invoiceid');
   var invoiceidError = document.querySelector('#smart-button-container #invoiceidError');
   var invoiceidDiv = document.querySelector('#smart-button-container #invoiceidDiv');

   var elArr = [description, amount];

   if (invoiceidDiv.firstChild.innerHTML.length > 1) {
     invoiceidDiv.style.display = "block";
   }

   var purchase_units = [];
   purchase_units[0] = {};
   purchase_units[0].amount = {};

   function validate(event) {
     return event.value.length > 0;
   }

   paypal.Buttons({
     style: {
       color: 'blue',
       shape: 'rect',
       label: 'pay',
       layout: 'vertical',
       
     },

     onInit: function (data, actions) {
       actions.disable();

       if(invoiceidDiv.style.display === "block") {
         elArr.push(invoiceid);
       }

       elArr.forEach(function (item) {
         item.addEventListener('keyup', function (event) {
           var result = elArr.every(validate);
           if (result) {
             actions.enable();
           } else {
             actions.disable();
           }
         });
       });
     },

     onClick: function () {
       if (description.value.length < 1) {
         descriptionError.style.visibility = "visible";
       } else {
         descriptionError.style.visibility = "hidden";
       }

       if (amount.value.length < 1) {
         priceError.style.visibility = "visible";
       } else {
         priceError.style.visibility = "hidden";
       }

       if (invoiceid.value.length < 1 && invoiceidDiv.style.display === "block") {
         invoiceidError.style.visibility = "visible";
       } else {
         invoiceidError.style.visibility = "hidden";
       }

       purchase_units[0].description = description.value;
       purchase_units[0].amount.value = amount.value;

       if(invoiceid.value !== ) {
         purchase_units[0].invoice_id = invoiceid.value;
       }
     },

     createOrder: function (data, actions) {
       return actions.order.create({
         purchase_units: purchase_units,
       });
     },

     onApprove: function (data, actions) {
       return actions.order.capture().then(function (orderData) {

         // Full available details
         console.log('Capture result', orderData, JSON.stringify(orderData, null, 2));

         // Show a success message within this page, e.g.
         const element = document.getElementById('paypal-button-container');
         element.innerHTML = ;

element.innerHTML = '

Thank you for your payment!

'; 

         // Or go to another URL:  actions.redirect('thank_you.html');
         
       });
     },

     onError: function (err) {
       console.log(err);
     }
   }).render('#paypal-button-container');
 }
 initPayPalButton();
 </script>
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