PayPal Smart Buttons Custom amount - paypal

Question

i'm having a bit of an issue with some code regarding the paypal smart button i'm no code expert i dabble a bit but could do with some help.
I have the button set up and all is working but i would like to make it so the customer can enter the amount they wish to pay but everything i have tried has failed so far.
for example if customer A owes £25 they can visit the pay section enter £25 and then click the nice new fancy paypal button.
Been looking for like 3 days now and hitting dead ends im no coder i know a bit but not enough to work out the issue.
<script src="https://www.paypal.com/sdk/js?client-id=xxxxxxx&currency=GBP&commit=true">
</script>
<div id="paypal-button-container"></div>
<script>
paypal.Buttons({
createOrder: function(data, actions) {
// Set up the transaction
return actions.order.create({
purchase_units: [{
amount: {
value: '10'
}
}]
});
}
}).render('#paypal-button-container')
</script>

Answer 1

You have to pass the amount dynamically to PayPal Create order function.
Added a input field and passed amount to function - in addition to this you can check for negative and non 0 amount as well by adding checks to input fields.
Try the below basic code , i hope that this will solve the issue
<script src="https://www.paypal.com/sdk/js?client-id=xxxxxxx&currency=GBP&commit=true">
</script>
<label>Enter amount : </label><input name="amount" type="text" id="amount" />
<!-- Set up a container element for the button -->
<div id="paypal-button-container"></div>
<script>
paypal.Buttons({
createOrder: function(data, actions) {
var amt = document.getElementById("amount").value;
// Set up the transaction
return actions.order.create({
purchase_units: [{
amount: {
value: amt
}
}]
});
}
}).render('#paypal-button-container')
</script>

Answer 2

Building on the example by PayPal_vidya, I used the following code that worked with the latest PayPal smart button code:
<div id="paypal-button-container">
<label>Enter amount : </label><input name="amount" type="text" id="amount" />
</div>
<script src="https://www.paypal.com/sdk/js?client-id=sb&currency=USD" data-sdk-integration-source="button-factory"></script>
<script>
paypal.Buttons({
style: {
shape: 'rect',
color: 'gold',
layout: 'vertical',
label: 'paypal',
},
createOrder: function(data, actions) {
amt = document.getElementById("amount").value;
return actions.order.create({
purchase_units: [{
amount: {
value: amt
}
}]
});
},
onApprove: function(data, actions) {
return actions.order.capture().then(function(details) {
alert('Transaction completed by ' + details.payer.name.given_name + '!');
});
}
}).render('#paypal-button-container');
</script>