Question

How I can allow negative numbers in my mask using jQuery Masked Input plugin?

Answer 1

Start by going to the “documentation” page for the plugin.
http://digitalbush.com/projects/masked-input-plugin/

Then reference the section that starts with “You can now supply your own mask definitions.”

jQuery(function($){
   $.mask.definitions['~']='[+-]';
   $("#eyescript").mask("~9.99 ~9.99 999");
});

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So you would probably want something like….

jQuery(function($){
   $.mask.definitions['~']='[+-]?';
   $("#eyescript").mask("~999999999");
});

I’m assuming the question mark at the end ‘[+-]?’ will work as expected for a regex fragment.