jquery - How to catch input on document[keypress] on window in javascript from Zebra mc330m scanner? - Stack Overflow

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I configured the scanner to send Enter at the end of the input and js reads it correctly but the other characters are lost.

I have tried to decode the input characters with event.keyCode, event.which, event.charCode and nothing works. If I attach it to normal input it works. It also works in the browser address bar (chrome). But when I attach it to the document['onkeypress'] it doesn't read the characters.

I tried Martin Orth solution from here: but I couldn't make it work I even don't know if it's the same scanner.

From here I understood that the scanner is sending ASCII characters and javascript has no mechanizm to read them?

If anyone knows the solution to this problem, help is highly appreciated. I prefer with js/jquery if it is possible at all.

I configured the scanner to send Enter at the end of the input and js reads it correctly but the other characters are lost.

I have tried to decode the input characters with event.keyCode, event.which, event.charCode and nothing works. If I attach it to normal input it works. It also works in the browser address bar (chrome). But when I attach it to the document['onkeypress'] it doesn't read the characters.

I tried Martin Orth solution from here: https://developer.zebra./thread/35513 but I couldn't make it work I even don't know if it's the same scanner.

From here I understood that the scanner is sending ASCII characters and javascript has no mechanizm to read them? https://developer.zebra./thread/34536

If anyone knows the solution to this problem, help is highly appreciated. I prefer with js/jquery if it is possible at all.

• javascript
• jquery
• barcode

Share Improve this question Follow edited Oct 2, 2019 at 20:55 DelphiCoder 2,01711 gold badge1717 silver badges2727 bronze badges asked Feb 19, 2019 at 14:30 martomarto 46011 gold badge55 silver badges1717 bronze badges

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2 Answers 2

Sorted by: Reset to default 4

What this code does is it creates an input focuses on it, but absolutely positions off screen becacuse IE has a problem with focusing on hidden text fields. Then detects changes to the input and outputs that for now to console.

$(document).ready(function(){
     $(".scanner-input").focus().on("input",function(){
          let barcode = $(this).val();
          console.log(barcode);
          $(this).val("");
     }).blur(function(){
         $(this).focus();
     });
});

.scanner-input{position:absolute;left:-10000px;}

<script src="https://cdnjs.cloudflare./ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="text" class="scanner-input">

This feature, using keypress, was recently added to DataWedge 7.3 which is included in the latest MC33 OS update (02.13.15 - LG Update 16) - I wrote a blog about how to use it: https://developer.zebra./blog/listening-keypress-events-datawedge. For clarity, I work for Zebra

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