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Regex/Javascript to transform Degrees Decimal Minutes to Decimal Degrees

I have some javascript code that converts Decimal Degree Minutes to Decimal Degrees. But something is slightly screwy and am hoping someone here will know how to fix it.

How to I get this to consistently work when a user removes the ° or has extra spaces?

With the ° character it works great:

input "77° 50.51086497"
output "77.8418477495" 

input "-113° 40.54687527"
output "-113.6757812545"

However without the ° it sometimes breaks:

NOT WORKING

input "77 50.51086497"
ouput "775.0085144161667" 

WORKING

input "-113 40.54687527"
output "-113.6757812545" 

Same thing with extra spaces:

NOT WORKING

input "77   ` ` ` ` ` ` ` `50.51086497" 
output "775.0085144161667" 

WORKING

input "-113   ` ` ` ` ` ` ` `40.54687527 "
output "-113.6757812545" 

Here is my code: Please see the JSFIDDLE TO TEST

function ddmToDeg(ddm) { 
    if (!ddm) { 
        return Number.NaN; 
    } 
    var neg= ddm.match(/(^\s?-)|(\s?[SW]\s?$)/)!=null? -1.0 : 1.0; 
    ddm= ddm.replace(/(^\s?-)|(\s?[NSEW]\s?)$/,''); 
    ddm= ddm.replace(/\s/g,''); 
    var parts=ddm.match(/(\d{1,3})[.,°d]?(\d{0,2}(?:\.\d+)?)[']?/); 
        //dms.match(/(\d{1,3})[.,°d]?(\d{0,2})[']?(\d{0,2})[.,]?(\d{0,})(?:["]|[']{2})?/);
    if (parts==null) { 
        return Number.NaN; 
    } 
    // parts: 
    // 0 : degree 
    // 1 : degree 
    // 2 : minutes 


    var d= (parts[1]?         parts[1]  : '0.0')*1.0; 
    var m= (parts[2]?         parts[2]  : '0.0')*1.0; 
    var dec= (d + (m/60.0))*neg; 
    return dec; 
}

Answer 1

I answered this on the original question: Regex/Javascript to transform Degrees Decimal Minutes to Decimal Degrees

Solution posted to your fiddle: http://jsfiddle.net/NJDp4/6/

dmsToDeg: function(dms) { 
        if (!dms) { 
            return Number.NaN; 
        } 
        var neg= dms.match(/(^\s?-)|(\s?[SW]\s?$)/)!=null? -1.0 : 1.0; 
        dms= dms.replace(/(^\s?-)|(\s?[NSEW]\s?)$/,''); 
    var parts=dms.match(/(\d{1,3})[.,°d ]?\s*(\d{0,2}(?:\.\d+)?)[']?/); 
        if (parts==null) { 
            return Number.NaN; 
        } 
        // parts: 
        // 0 : degree 
        // 1 : degree 
        // 2 : minutes 


        var d= (parts[1]?         parts[1]  : '0.0')*1.0; 
        var m= (parts[2]?         parts[2]  : '0.0')*1.0; 
        var dec= (d + (m/60.0))*neg; 
        return dec; 
    }

The reason this was working for “-113 40.54687527” but not for “77 50.51086497” is that the code was ripping out spaces and the sign (leaving “11340.54687527” and “7750.51086497”) and then grabbing the first 3 digits to use as degrees (so “113” and “775”). I’ve modified this so that it no longer strips out spaces before grabbing the two numbers.