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You can overwrite some things in ReceiptScreenWidget.
1. The get_receipt_render_env function of the ReceiptScreenWidget. This function is used here:
render_receipt: function() {
this.$('.pos-receipt-container').html(QWeb.render('PosTicket', this.get_receipt_render_env()));
},
var CustomReceiptScreenWidget = ReceiptScreenWidget.include({
rand_number_for_ticket: function(){
return 7;
},
get_receipt_render_env: function() {
var order = this.pos.get_order();
var number = 4;//use js to find rand number
return {
widget: this,
pos: this.pos,
order: order,
receipt: order.export_for_printing(),
orderlines: order.get_orderlines(),
paymentlines: order.get_paymentlines(),
random_number: this.rand_number_for_ticket(),
};
},
});
2. Overwrite the xml template.
<t t-extend="ReceiptScreenWidget">
<!--place with jquery the rand number-->
<t t-jquery="some_selector" t-operation="after">//or another operation
<span t-esc="random_number"/>
</t>
</t>