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HTML 

              
                <h1 class="h5 mb-3">Flmngr: select image with preview</h1>

<div id="btn" class="btn btn-primary" style="opacity:0.2;cursor:default">Select image...</div>
<div id="loading" style="font-size:12px">Loading file manager...</div>

<h2 class="h5 mt-5">Selected image</h2>

<p id="hint" style="display:none" class="hint"><b>Hint</b>: the preview is clickable.</p>

<div id="images">
  No image selected yet.
</div>
!

CSS 

              
                body {
  padding: 20px;
  background-color: #F4F4F4;
}

#images {
    
  p {
    margin: 5px 0 0 0;
    font-size: 14px;
    color: #444;
  }
  
  img[data-src-original] {
    cursor: pointer;
    border: 2px solid #007FFF;
    
    &:hover {
      border-color: orange;
    }
  }
  
}

.lum-lightbox-image-wrapper {
    background: rgba(0, 0, 0, 0.7);
}

.hint {
  color: #007FFF; 
  font-size:14px; 
  margin-top: 10px; 
  line-height: 16px;
}
!

JS 

              
                // In real app replace with:
// import Flmngr from "flmngr";
import Flmngr from "https://cdn.skypack.dev/flmngr";

// This demo uses a script for animating showing full-screen image when user clicks on a preview (a-la LightBox)
import {Luminous} from "https://cdn.skypack.dev/luminous-lightbox@2.4.0";

Flmngr.load({
  apiKey: "FLMNFLMN",
  urlFileManager: 'https://fm.flmngr.com/fileManager',
  urlFiles: 'https://fm.flmngr.com/files',
  imageFormats: [
     {
        id: "preview",
        title: "Preview",
        suffix: "-preview",
        maxWidth: 250,
        maxHeight: 250
     }
  ]
}, {
  onFlmngrLoaded: () => {
    attachOnClickListenerToButton();
  }
});

function attachOnClickListenerToButton() {
  let elBtn = document.getElementById("btn");
  
    // Style button as ready to be pressed
    elBtn.style.opacity = 1;
    elBtn.style.cursor = "pointer";
    let elLoading = document.getElementById("loading");
    elLoading.parentElement.removeChild(elLoading);

    // Add a listener for selecting files
    elBtn.addEventListener("click", () => {
      selectFiles();
    });
}

function selectFiles() {
  Flmngr.open({
    createImageFormats: ["preview"],
    acceptExtensions: ["png", "jpeg", "jpg", "webp", "gif"],
    isMultiple: false,
    onFinish: (files) => {
      showSelectedImageWithPreview(files);
    }
  });
}

function showSelectedImageWithPreview(files) {
  let elImages = document.getElementById("images");
  elImages.innerHTML = "";
  
  // As far we requested just one file, it is the only item of the array
  let file = files[0];
  let filePreview = file.formats.find(file => file.format === "preview");
  let urlPreview = Flmngr.getNoCacheUrl(filePreview.url);
  let urlOriginal = Flmngr.getNoCacheUrl(file.url)
  
  // Add preview image
  let elTextPreview = document.createElement("p");
  elTextPreview.textContent = "Preview image";
  elImages.appendChild(elTextPreview);
  
  let elImgPreview = document.createElement("img");
  
  elImgPreview.src = urlPreview;
  elImgPreview.alt = "Image preview selected in Flmngr";
  elImgPreview.setAttribute("data-src-original", urlOriginal);
  elImages.appendChild(elImgPreview);
  attachLightBoxToImage(elImgPreview);
  
  // Add image original
  let elText = document.createElement("p");
  elText.textContent = "Original image";
  elImages.appendChild(elText);
  
  let elImg = document.createElement("img");
  elImg.src = urlOriginal;
  elImg.alt = "Image selected in Flmngr";
  elImages.appendChild(elImg);
  
  document.getElementById("hint").style.display = "block";
}

function attachLightBoxToImage(elImg) {
  new Luminous(
    elImg,
    {
      "showCloseButton": true,
      "sourceAttribute": "data-src-original",
    }
  );
}
!
999px

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