使用Jquery验证插件对输入框的更改进行负值检查

Question

I have multiple input boxes and I have to check whether the entered values are positive or negative using jquery Validator plugin .

It is basically doing some calculation based on the value entered in the first input box.

The value entered must be positive, if not I should throw an error message saying the value must be positive or greater than zero.

Answer 1

Use the min rule to specify that the minimum value is 1.

$("#formid").validate({
    rules: {
        fieldname: {
           min: 1
        },
    messages: {
       fieldname: {
           min: "Value must be greater than 0"
       }
    }
});

Answer 2

You can use regex for validating numeric value. Code given below. The function will return true if input box contains numeric value (negative or positive)

function checkNumericValue(num)
{
var objRegExp  =  /(^-?\d\d*\.\d*$)|(^-?\d\d*$)|(^-?\.\d\d*$)/;
return objRegExp.test(num);
}

For checking -ve value, follow the link How to check the value given is a positive or negative integer?