Check whether white spaces exist without using trim

Question

I have following code that checks whether date is valid. http://jsfiddle.net/uzSU6/36/

If there is blank spaces in date part, month part or year part the date should be considered invalid. For this, currently I am checking the length of string before and after trim operation. It works fine. However is there a better method to check for white spaces? (For example, using === operator)

function isValidDate(s) 
{
var bits = s.split('/');

//Javascript month starts at zero
var d = new Date(bits[2], bits[0] - 1, bits[1]);


if ( isNaN( Number(bits[2]) ) ) 
{
    //Year is not valid number
    return false;
}

if ( Number(bits[2]) < 1 ) 
{
    //Year should be greater than zero
    return false;
}


//If there is unwanted blank space, return false
if  ( ( bits[2].length != $.trim(bits[2]).length ) ||
      ( bits[1].length != $.trim(bits[1]).length ) ||
      ( bits[0].length != $.trim(bits[0]).length ) )
{
    return false;
}



//1. Check whether the year is a Number
//2. Check whether the date parts are eqaul to original date components
//3. Check whether d is valid

return d && ( (d.getMonth() + 1) == bits[0]) && (d.getDate() == Number(bits[1]) );

}

Adil · Accepted Answer · 2012-12-17T09:33:09.927

6

You can use indexOf() function if there is space in the date string.

if(s.indexOf(' ') != -1)
{
    //space exists
}

edited Dec 17 '12 at 09:33

answered Dec 17 '12 at 09:22

Adil

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score 1 · Answer 2 · answered Dec 17 '12 at 09:25

1

you can test for any whitespace like

 if( /\s/g.test(s) )

it will test any whitespace.

answered Dec 17 '12 at 09:25

user160820

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Alnitak · Answer 3 · 2012-12-17T09:37:28.973

You may want to consider using a regexp to test your string's validity:

function isValidDate(s) {
    var re = /^(\d{1,2})\/(\d{1,2})\/(\d{4})$/;
    var mdy = s.match(re);
    if (!mdy) {
        return false;   // string syntax invalid;
    }

    var d = new Date(mdy[3], mdy[1] - 1, mdy[2]);
    return (d.getFullYear() == mdy[3]) &&
           (d.getMonth() == mdy[1] - 1) &&
           (d.getDate() == mdy[2]);
}

The regex does all this in one go:

checks that there are three fields separated by slashes
requires that the fields be numbers
allows day and month to be 1 or 2 digits, but requires 4 for the year
ensures that nothing else in the string is legal

See http://jsfiddle.net/alnitak/pk4wU/

Check whether white spaces exist without using trim

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