html5 - What is the Javascript Equivalent of A User Clicking on the Input Type File Button? -


what need programmatically hook file select dialog created when user clicks on button input type file, without user clicking on button. javascript test if file exists, , handle needed: read it, copy it, etc.

try utilizing onchange event access file object if user selects file ; js cannot select user file . 

var input = document.queryselector("[type=file]");    input.onchange = function() {    console.log(this.files)  }
<input type="file" />


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