Question

I have this code:

$(document).ready(function() {

 var MidUpperArmCircumference = 0;
 var TricepsSkinfold = 0;

function checkMethod(method,parameters){
    $('#'+method+'_check').change(function() {
    if (this.checked == true) {
        $.each(parameters, function() {
            $('.'+this).css('color','blue');
            this++;    //HERE IS THE ERROR!
        });
    }
    });
}

var parametersMuscleArea = ['TricepsSkinfold', 'MidUpperArmCircumference'];
checkMethod('MidUpperArmMuscleArea',parametersMuscleArea);
});

How can I increase the variables TricepsSkinfold and MidUpperArmCircumference inside the $.each function?

Answer 1

this is the string, not the a reference to the local variable. You can’t increase your variable by increasing the string. Also, you’re trying to refer to a local variable by a name as given in a string. With local variables, this can only be done via eval, or by namespacing the variables.

This will work:

var ns = {
    MidUpperArmCircumference: 0,
    TricepsSkinfold: 0
};

function checkMethod(method,parameters){
    $('#'+method+'_check').change(function() {
        if (this.checked == true) {
            $.each(parameters, function() {
                $('.'+this).css('color','blue');
                ns[this]++;    // <-- Fixed.
            });
        }
    });
}