How validate confirm password with vue/quasar

Question

I write a code to connect to an application in vue/quasar/C# I'm just begin with vue. And I don't understand how rules run. I write this to check input is not empty for password/ConfimPassword

<q-form v-bind:submit="createUser"
            v-bind:reset="resetCreateUser"
            class="q-gutter-md"
            v-if="status==2"
            ref="frmCreateUser"
            autofocus>
         <q-input filled
                 v-model="loginData.password"
                 label="Votre mot de passe"
                 hint="Saisissez votre mot de passe"
                 v-bind:type="isPwd ? 'password' : ''"
                 lazy-rules
                 v-bind:rules="[ val => val && val.length > 0 || 'Saisissez votre mot de passe']"
                 ref="fldPasswordCreateUser"
                 data-vv-name="fldPasswordCreateUser">
            <template v-slot:append>
                <q-icon :name="isPwd ? 'visibility_off' : 'visibility'"
                        class="cursor-pointer"
                        v-on:click="isPwd = !isPwd"></q-icon>
            </template>
        </q-input>
        <q-input filled
                 v-model="loginData.passwordConfirm"
                 label="Confirmez votre mot de passe"
                 v-bind:type="isPwd ? 'password' : ''"
                 lazy-rules
                 v-bind:rules="[ val => val && val.length > 0 || 'Saisissez votre mot de passe']">
            <template v-slot:append>
                <q-icon :name="isPwd ? 'visibility_off' : 'visibility'"
                        class="cursor-pointer"
                        v-on:click="isPwd = !isPwd"></q-icon>
            </template>
        </q-input>
       ...
    </q-form>

I check on my method if (this.loginData.password == this.loginData.passwordConfirm) {... But I want modify my v-bind:rules and display error like empty field and put 'Password not match' But I have always errors sysntaxs... Thanks for your helps

UPDATE

I try

v-bind:rules="[val => val && val.length > 0 || 'saisissez quelque chose :)',val => val != $refs.fldPasswordChange || 'Mots de passe différents']"

To have 2 controls but seems second not fire

UPDATE2

I try what Dean suggest

 <q-input filled
                 v-model="loginData.password"
                 label="Votre mot de passe"
                 hint="Saisissez votre mot de passe"
                 v-bind:type="isPwd ? 'password' : ''"
                 lazy-rules
                 v-bind:rules="Required"
                 ref="fldPasswordChange">
            <template v-slot:append>
                <q-icon :name="isPwd ? 'visibility_off' : 'visibility'"
                        class="cursor-pointer"
                        v-on:click="isPwd = !isPwd"></q-icon>
            </template>
        </q-input>
        <q-input filled
                 v-model="loginData.passwordConfirm"
                 label="Confirmez votre mot de passe"
                 v-bind:type="isPwd ? 'password' : ''"
                 lazy-rules
                 v-bind:rules="ConfirmPWD"
                 ref="fldPasswordChangeConfirm">
            <template v-slot:append>
                <q-icon :name="isPwd ? 'visibility_off' : 'visibility'"
                        class="cursor-pointer"
                        v-on:click="isPwd = !isPwd"></q-icon>
            </template>
        </q-input>

and

 computed: {
            ConfirmPWD() {
                return [
                    (v) => !!v || "Saisissez quelquechose :-)",
                    (v) => v != this.$refs.fldPasswordChange.value || "Mots de passe différents"
                 ]
            },
            Required() {
                return [(v) => !!v || 'Saisissez quelque chose :-)']
            }
        },

But seems second controls not fire. If I don't fill confimPassword, i've message but if I put 2 different password nothing.. I put breakpoint, all value is good. Cetainly a problem of syntax in my condition.. when I put

(v) => v != this.$refs.fldPasswordChange.value || "Mots de passe différents"

without (v) =>:,v || "Saisissez quelquechose :-)", no message error

Answer 1

<q-input filled
             v-model="loginData.password"
             label="Votre mot de passe"
             hint="Saisissez votre mot de passe"
             v-bind:type="isPwd ? 'password' : ''"
             lazy-rules
             v-bind:rules="Required"
             ref="fldPasswordChange">
        <template v-slot:append>
            <q-icon :name="isPwd ? 'visibility_off' : 'visibility'"
                    class="cursor-pointer"
                    v-on:click="isPwd = !isPwd"></q-icon>
        </template>
    </q-input>
    <q-input filled
             v-model="loginData.passwordConfirm"
             label="Confirmez votre mot de passe"
             v-bind:type="isPwd ? 'password' : ''"
             lazy-rules
             v-bind:rules="ConfirmPWD"
             ref="fldPasswordChangeConfirm">
        <template v-slot:append>
            <q-icon :name="isPwd ? 'visibility_off' : 'visibility'"
                    class="cursor-pointer"
                    v-on:click="isPwd = !isPwd"></q-icon>
        </template>
    </q-input>

and

computed: {
            ConfirmPWD() {
                return [
                    (v) => !!v || "Saisissez quelque chose :-)",
                    (v) => v == this.$refs.fldPasswordChange.value || "Mots de passe différents"
                 ]
            },
            Required() {
                return [(v) => !!v || 'Saisissez quelque chose :-)']
            }
        },

It's just a misunderstanding about first part... I need put good expression not condition to put error message.