编写我的第一个jQuery插件

Question

Good Day,

I'm trying to write my first jQuery plugin. I believe it to be a simple one. When I focus in on a textbox, I want to remove any currency formatting (ie removing '$', ',', and '.') When I focus out of a textbox, I want to apply numeric comma formatting.

(function($) {
    $.fn.enableCommify = function() {
        $(this).on('focus', function () {
            var currentValue = $(this).val().trim();
            var stripped = currentValue.replace(',', '');
            $(this).val(stripped);
        });

        $(this).on('focusout', function () {
            var currentValue = $(this).val();
            $(this).val(currentValue.toLocaleString());
        });
    }
}(jQuery));

and when I use it:

$('.commify').enableCommify();

but it's not working. What else am I missing?

ps I'm aware that there are plugins that do this, I'm just trying to learn how to write one then move on to bigger things.

TIA,

coson

Answer 1

toLocaleString() only adds commas when it's applied to a number. But $(this).val() is a string, not a number. Use parseInt() to convert it to a number.

Also, to replace multiple matches of a string, you need to use a regexp with the g modifier.

 (function($) { $.fn.enableCommify = function() { $(this).on('focus', function() { var currentValue = $(this).val().trim(); var stripped = currentValue.replace(/,/g, ''); $(this).val(stripped); }); $(this).on('focusout', function() { var currentValue = parseInt($(this).val(), 10); $(this).val(currentValue.toLocaleString()); }); } }(jQuery)); $('.commify').enableCommify(); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input class="commify">