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What I need to do is programmatically hook into the file select dialog created when a user clicks on the button for input type file, without the user actually clicking on the button. The JavaScript would test if a file exists, and handle it as needed: read it, copy it, etc.

Brian Tompsett - 汤莱恩
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Guessed
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  • Could the file:// protocol be what you're looking for? – Graham P Heath Aug 30 '15 at 23:39
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    Um, you want to just click the button or try selecting a file? Selelcting the file with JS is not going to happen... – epascarello Aug 31 '15 at 00:45
  • @epascarello Yes, I ultimately want JS to try and select a file autonomously - crawl the client's file system, effectively. – Guessed Aug 31 '15 at 02:43
  • @Guessed _"Yes, I ultimately want JS to try and select a file autonomously - crawl the client's file system, effectively. "_ This is not possible. See http://stackoverflow.com/a/29873845/ – guest271314 Aug 31 '15 at 03:03

1 Answers1

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Try utilizing onchange event to 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" />
guest271314
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  • Since in the scenario presented the user does not click and therefore does not select a file either, what would trigger the onchange? – Guessed Aug 30 '15 at 23:39
  • @Guessed See http://stackoverflow.com/questions/29728705/trigger-click-on-input-file-on-asynchronous-ajax-done – guest271314 Aug 31 '15 at 00:14
  • @epascarello _"Because you did not answer the question...."_ ? See _"`js` cannot select user file"_ at post ? Similar to last sentence at comment http://stackoverflow.com/questions/32302210/what-is-the-javascript-equivalent-of-a-user-clicking-on-the-input-type-file-butt/32302224#comment52481312_32302210 ? see also `js` included at post which could access user file , if selected by user ? , link to SO Question , accepted Answer at second comment above . Can detail why solution , explaination at post does not answer question ? How could this answer be improved ? – guest271314 Aug 31 '15 at 00:54