JQuery code only working in script tag not in external file

I'm using this plugin http://plugins.krajee.com/file-input for image upload and the piece of jquery code only works in a script tag only, not in the external file. I have tried many times but no success yet.

$(document).ready(function(){
$("#imageUploadOffer").fileinput({
    theme: "fa",
    browseClass: "btn btn-outline-info btn-block",
    showCaption: false,
    showRemove: false,
    showUpload: false,
    allowedFileExtensions: ["jpg", "png", "gif"],
    maxImageWidth: 250,
    maxImageHeight: 250
});

});

Thanks in advance. I'm a newbie.

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