<mdl-dialog> from mdl 1.1, for vue-mdl

app.vue

<template>
    <div>
        <mdl-dialog v-if="alert" title="alert heading" :message="alert">
        </mdl-dialog>
    </div>
</template>

<script>
import MdlDialog from './MdlDialog.vue';

export default {
    components: {
        MdlDialog,
    },
    data() {
        return {
            alert: '',
        }
    },
    ready() {
        this.alert = "hello world";
    },
};
</script>

MdlDialog.vue

<style>
/* for dialog-polyfill, from node_modules/dialog-polyfill/dialog-polyfill.css */
dialog {
    position: absolute;
    left: 0; right: 0;
    width: -moz-fit-content;
    width: -webkit-fit-content;
    width: fit-content;
    height: -moz-fit-content;
    height: -webkit-fit-content;
    height: fit-content;
    margin: auto;
    border: solid;
    padding: 1em;
    background: white;
    color: black;
    display: none;
}

dialog[open] {
    display: block;
}

dialog + .backdrop {
    position: fixed;
    top: 0; right: 0; bottom: 0; left: 0;
    background: rgba(0,0,0,0.1);
}

/* for small devices, modal dialogs go full-screen */
@media screen and (max-width: 540px) {
    dialog[_polyfill_modal] {  /* TODO: implement */
        top: 0;
        width: auto;
        margin: 1em;
    }
}

._dialog_overlay {
    position: fixed;
    top: 0; right: 0; bottom: 0; left: 0;
}
</style>

<template>
    <dialog
            class="mdl-dialog">
        <h4 class="mdl-dialog__title">{{ title }}</h4>
        <div class="mdl-dialog__content">
            <p>
                {{ message }}
            <p>
        </div>
        <div class="mdl-dialog__actions">
            <button type="button" class="mdl-button" @click="close">{{ $t('nav.close') }}</button>
        </div>
    </dialog>
</template>

<script>
import 'dialog-polyfill';

export default {
    props: {
        title: '',
        message: '',
    },

    ready() {
        this.$el.showModal();
    },

    methods: {
        close() {
            this.$el.close();
        },
    },
};
</script>