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Event Handlers for Mobile phone functions?

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I have a script to limit field characters to numbers only.  Works great on computer/html but not on Smartphones.  


function isNumberKey(evt){
    var charCode = (evt.which) ? evt.which : event.keyCode
    if (charCode > 31 && (charCode < 48 || charCode > 57))
        return false;
    return true;
document.getElementById('InsertRecordTIME2').onkeypress =isNumberKey;


Do smart phones use an entirely different set of event handlers or script?  Is it the .onkeypress or something more intense?

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