Javascript and MS Edge behaviour

[Purple]

I have the following Javascript function to manage the edit of a field on a bootstrap modal web page. It works fine with Chrome but Edge does a page reload after completion which closes the modal.

Any thoughts on why this is happening? Suggestions to stop it?

function edit(element) {
    if (document.getElementById(element + "-glyph").className == "glyphicon glyphicon-pencil") {
        document.getElementById(element).readOnly = false;
        document.getElementById(element + "-glyph-remove").style.visibility = "visible";
        document.getElementById(element + "-can").style.visibility = "visible";
        document.getElementById(element + "-glyph").className = "glyphicon glyphicon-ok";
        document.getElementById(element + "-glyph").title = "save?";
        document.getElementById(element).focus();
        return true;
    }
}

[Purple]

Ok - update, I found the issue..

There was an issue with my handling of a button in the HTML.

I had set the type to submit rather than button..