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Preview a PDF before It is Uploaded in a DataPage


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Hi there. I was trying to find a way to preview a PDF file before it is uploaded in a DataPage. The flow described in this article works for images only: https://howto.caspio.com/tech-tips-and-articles/advanced-customizations/preview-an-image-before-it-is-uploaded-in-a-datapage/

Here is a solution I came up with:

<script>

const HTMLFileInput = document.getElementById("EditRecordFile_1");

HTMLFileInput.addEventListener("change", event => {
const src = URL.createObjectURL(event.target.files[0]);
const outputWidth = window.getComputedStyle(HTMLFileInput.parentElement.parentElement).getPropertyValue('width')
const outputHeight = parseInt(outputWidth.replace('px',''))*1.3+'px'

if(document.querySelector('#output')==null) {
HTMLFileInput.parentElement.insertAdjacentHTML('afterend', `<iframe src="${src}" width="${outputWidth}" height="${outputHeight }" id="output" class="cbFormFieldCell">IFRAME IS NOT SUPPORTED IN YOUR BROWSER</iframe>`)
}
else {
document.querySelector('#output').setAttribute("src", src)
}
})

</script>


Just substitute EditRecordFile_1 with id of your file input. You can also tweak the value of width and the height of the iframe so it fits your usual pdf file size.

Hope this helps
 

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