[Rails] Show thumbnail preview of image before upload

Is there any ruby way to show thumbnail preview of image before upload?

Using below javascript, I can achieve this

window.URL = window.URL || window.webkitURL;

var fileElem = document.getElementById("fileElem");

function handleFiles(files) {
var img = document.getElementById("image-preview");

if (!files.length) {
img.src = "/img/default-profile-image.png";
} else {
img.src = window.URL.createObjectURL(files[0]);
img.height = 60;
img.onload = function(e) {
window.URL.revokeObjectURL(this.src);
}
}

}

but I want to keep the thumbnail image in the case of validation fails.

Please help me....

Thanks in advance,
Avantec

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