Highlight "red" the text box when value is not numeric, numeric with dot or comma

Same as below (upvoted) since it does 90% of the job, except assuming by your comment that you want bootstraps warning class applied to the input.

All of these classes are defined on Bootstraps website (getbootstrap.com). So you want to apply the input classes which I believe are on the "components" page.

Use jQuery's addClass() given the event that @Reza layed out:

var val = $("#inputId").val();
if(Math.floor(val) == val && $.isNumeric(val))
    $("#inputId").addClass('input-warning');