primevue-mirror/apps/showcase/doc/fileupload/CustomUploadDoc.vue

<template>
    <DocSectionText v-bind="$attrs">
        <p>Uploading implementation can be overridden by enabling <i>customUpload</i> property. This sample, displays the image on the client side with a grayscale filter.</p>
    </DocSectionText>
    <div class="card flex flex-col items-center gap-6">
        <FileUpload mode="basic" @select="onFileSelect" customUpload auto severity="secondary" class="p-button-outlined" />
        <img v-if="src" :src="src" alt="Image" class="shadow-md rounded-xl w-full sm:w-64" style="filter: grayscale(100%)" />
    </div>
    <DocSectionCode :code="code" />
</template>

<script>
export default {
    data() {
        return {
            src: null,
            code: {
                basic: `
<FileUpload mode="basic" @select="onFileSelect" customUpload auto severity="secondary" class="p-button-outlined" />
<img v-if="src" :src="src" alt="Image" class="shadow-md rounded-xl w-full sm:w-64" style="filter: grayscale(100%)" />
`,
                options: `
<template>
    <div class="card flex flex-col items-center gap-6">
        <FileUpload mode="basic" @select="onFileSelect" customUpload auto severity="secondary" class="p-button-outlined" />
        <img v-if="src" :src="src" alt="Image" class="shadow-md rounded-xl w-full sm:w-64" style="filter: grayscale(100%)" />
    </div>
</template>

<script>
export default {
    data() {
        return {
            src: null
        }
    },
    methods: {
        onFileSelect(event) {
            const file = event.files[0];
            const reader = new FileReader();

            reader.onload = async (e) => {
                this.src = e.target.result;
            };

            reader.readAsDataURL(file);
        }
    }
};
<\/script>
`,
                composition: `
<template>
    <div class="card flex flex-col items-center gap-6">
        <FileUpload mode="basic" @select="onFileSelect" customUpload auto severity="secondary" class="p-button-outlined" />
        <img v-if="src" :src="src" alt="Image" class="shadow-md rounded-xl w-full sm:w-64" style="filter: grayscale(100%)" />
    </div>
</template>

<script setup>
import { ref } from "vue";

const src = ref(null);

function onFileSelect(event) {
    const file = event.files[0];
    const reader = new FileReader();

    reader.onload = async (e) => {
        src.value = e.target.result;
    };

    reader.readAsDataURL(file);
}
<\/script>
`
            }
        };
    },
    methods: {
        onFileSelect(event) {
            const file = event.files[0];
            const reader = new FileReader();

            reader.onload = async (e) => {
                this.src = e.target.result;
            };

            reader.readAsDataURL(file);
        }
    }
};
</script>