[Vuejs]-Vue Js – Calculation Criteria in Reverse

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0👍

You need to make computed properties they will recompute any time a dependancy is changed, for example: 

subtotal_with_ewa(){
     return Number((this.subtotal_price / 100) * 
     this.unit.reservation.prices.ewa_parentage) + Number(this.subtotal_price);
    }

You can use getters and setters with computed properties or separate them from the bound v-model on the fields.

0👍

The below functions should solve the problem.

the function accepts the percentage of each tax as argument and returns a json will all the values.

function fromSubTotal(subTotal, pre, vato, tx) {
    const preAmount = subTotal * pre / 100
    const vatoAmount = (subTotal + pre) * vato / 100
    const txAmount = subTotal * tx / 100
    const total = subTotal + preAmount + vatoAmount + txAmount
    return {subTotal, preAmount, vatoAmount, txAmount, total}
}

function fromTotal(total, pre, vato, tx) {
    const subTotal = (total * 100) / (100 + pre + tx + (1.01 * pre * vato))
    return fromSubTotal(subTotal, pre, vato, tx)
}

// eg.
console.log(fromSubTotal(100,1,1,1))
console.log(fromTotal(103.01,1,1,1))

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