Sales Tax Template Not Getting Pulled Nor Applied To A Custom Doctype

I created a custom Doctype, Proposal from Quotation. The rate(Unit Price) wasn’t getting multiplied with quantity to give me Amount(Total Price). The Total and Grand Total weren’t working, hence, @ Balamurugan_Ravichan gave me a code which worked for me to get the above. The code is below:

frappe.ui.form.on("Proposal Item", {
  item_code: function (frm, cdt, cdn) {
    var child = locals[cdt][cdn];
    if (child.item_code) {
      calculateTotal(frm);
    }
  },

  qty: function (frm, cdt, cdn) {
    var d = locals[cdt][cdn];
    frappe.model.set_value(cdt, cdn, "total_price", d.qty * d.unit_price);
    calculateTotal(frm);
  },

  unit_price: function (frm, cdt, cdn) {
    var d = locals[cdt][cdn];
    frappe.model.set_value(cdt, cdn, "total_price", d.qty * d.unit_price);
    calculateTotal(frm);
  },
});

function calculateTotal(frm) {
  var total = 0;
  frm.doc.items.forEach(function (item) {
    total += item.total_price;
  });
  frm.set_value("total", total);
}




frappe.ui.form.on("Proposal Item", {
  item_code: function (frm, cdt, cdn) {
    var child = locals[cdt][cdn];
    if (child.item_code) {
      calculateGrandTotal(frm);
    }
  },

  qty: function (frm, cdt, cdn) {
    var d = locals[cdt][cdn];
    frappe.model.set_value(cdt, cdn, "total_price", d.qty * d.unit_price);
    calculateGrandTotal(frm);
  },

  unit_price: function (frm, cdt, cdn) {
    var d = locals[cdt][cdn];
    frappe.model.set_value(cdt, cdn, "total_price", d.qty * d.unit_price);
    calculateGrandTotal(frm);
  },
});


function calculateGrandTotal(frm) {
  var grand_total = 0;
  frm.doc.items.forEach(function (item) {
    grand_total += item.total_price;
  });
  frm.set_value("grand_total", grand_total);
}



frappe.ui.form.on("Proposal Item", {
  item_code: function (frm, cdt, cdn) {
    var child = locals[cdt][cdn];
    if (child.item_code) {
      calculateNetTotal(frm);
    }
  },

  qty: function (frm, cdt, cdn) {
    var d = locals[cdt][cdn];
    frappe.model.set_value(cdt, cdn, "total_price", d.qty * d.unit_price);
    calculateNetTotal(frm);
  },

  unit_price: function (frm, cdt, cdn) {
    var d = locals[cdt][cdn];
    frappe.model.set_value(cdt, cdn, "total_price", d.qty * d.unit_price);
    calculateNetTotal(frm);
  },
});


function calculateNetTotal(frm) {
  var net_total = 0;
  frm.doc.items.forEach(function (item) {
    net_total += item.total_price;
  });
  frm.set_value("net_total", net_total);
}

The next challenge now is that the Sales Tax is not getting pulled, although set up. How do I get the system to calculate VAT? I sincerely need help with this. There is this code I have been playing with for the VAT but it only get called after I have saved the form and it simply attempt to add the VAT on each item whether I want VAT or not which is not how I want things to run! Also, the code give error while calculating each Item’s VAT and the Total/Grand Total are not being updated. Here is the code for that below:


frappe.ui.form.on("Proposal", {
    validate: function (frm) {
        frm.clear_table("taxes");

        var total_tax_amount = 0;

        $.each(frm.doc.items || [], function (i, item) {
            if (item.item_code) {
                var tax_and_charge = {
                    charge_type: "On Net Total",
                    account_head: "VAT - SGSL",
                    description: "VAT",
                    rate: 7.5
                };

                var item_tax_amount = (item.amount * tax_and_charge.rate) / 100;
                tax_and_charge.tax_amount = item_tax_amount;
                total_tax_amount += item_tax_amount;

                frm.add_child("taxes", tax_and_charge);
            }
        });

        frm.set_value("total_taxes_and_charges", total_tax_amount);

        var total_taxes = 0;
        $.each(frm.doc.taxes || [], function (i, tax_row) {
            total_taxes += tax_row.tax_amount || 0;
        });
        frm.doc.taxes.forEach(function (row) {
            row.total = total_taxes;
        });

        var total = (frm.doc.total || 0) + total_tax_amount;
        frm.set_value("total", total);

        frm.refresh_field("taxes");
        frm.refresh_field("total_taxes_and_charges");
        frm.refresh_field("total");
    }
});

Please can anyone help me solve this? Thank you all in advance.

Dear All,

Please I need help with this problem. How can it be solved? What are the available alternatives?

Hello everyone, please can i get any help with this?

Hello everyone, please is there a way I can solve this? Any alternative method to get custom doctype to pull sales tax or any charges at all?