Vue - Enhanced Image Cropper (Error: Unable to retrieve image result from this.$refs.cropper)

I have a crop function for Vue Advanced Cropper similar to the one below:

            crop() {
            const { canvas } = this.$refs.cropper.getResult();
            if (canvas) {
                const form = new FormData();
                canvas.toBlob(blob => {
                    form.append('files[]', blob);
                    // Maybe consider setting the appropriate file format here
                }, 'image/jpeg');

                this.formData = form;

            }

        },

This is how I've structured my HTML:

    <div v-if="cropView">
    <h1>Step 2: Crop images</h1>
    <div class="upload-example__cropper-wrapper">
        <div v-for="image in this.images" :key="image">
            <cropper ref="cropper" class="upload-example__cropper"
                     check-orientation :src="image.src"/>
            <button v-if="image.src" class="upload-example__button" @click="crop">Crop</button>
            <!--<div class="upload-example__reset-button" title="Reset Image" @click="reset()"></div>-->
            <div class="upload-example__file-type" v-if="image.type">
                {{ image.type }}
            </div>
        </div>
    </div>
</div>

I made sure to include the import statement for Cropper:

    import {Cropper} from 'vue-advanced-cropper'

The version specified in package.json is:

"vue-advanced-cropper": "^2.8.1"

Although everything seems to be working fine, I encounter the following error message within the crop function:
Uncaught TypeError: this.$refs.cropper.getResult is not a function

Initially, I thought that it could be related to iterating through multiple images, however, the issue persists even with just one image. I attempted to combine the upload to server functionality as shown in the tutorial here:

--- Edit ---

I also have export default set up, and while cropping works fine, I am unable to retrieve the results:

    export default {

    components: {
        Cropper,
    },

Answer №1

It's important to note that if you are using the same ref name for each element in your v-for loop, it is possible that this.$refs.cropper could be an array. This will vary depending on the version of Vue you are using. In such cases, you may need to pass a parameter to your crop function to ensure that the correct index of the calling element is known and getResult can be executed properly.

You might want to try console logging this.$refs or check out this helpful thread: Vue.js ref inside the v-for loop

Answer №2

aleksKamb found the perfect solution. By implementing indexes, everything started to function correctly. I made adjustments to the v-for loop like so:

            <div v-for="(image, index) in this.images" :key="image">
            <cropper ref="cropper" class="upload-example__cropper"
                     check-orientation :src="image.src"/>
            <button v-if="image.src" class="upload-example__button" @click="crop(index)">Crop</button>
            <!--<div class="upload-example__reset-button" title="Reset Image" @click="reset()"></div>-->
            <div class="upload-example__file-type" v-if="image.type">
                {{ image.type }}
            </div>
        </div>

I then updated the cropping method to this:

            crop(index) {
            const { canvas } = this.$refs.cropper[index].getResult();
            if (canvas) {
                const form = new FormData();
                canvas.toBlob(blob => {
                    form.append('files[]', blob);
                    // You may want to include specific file format settings here
                }, 'image/jpeg');

            }
        },

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