cannot get EPSG of bounding box

Question

I use openlayers 2.12.

I created a form where the user can insert a bounding box, to insert to the database a new borough.

To check the EPSG of the borough I tried the following

//ba bb bc bd came from the form
var thisIsNew=new OpenLayers.Bounds(ba, bb,bc, bd).getProjection();
alert (thisIsNew);

and also

var thisIsNew=new OpenLayers.Bounds(ba, bb,bc, bd);
var newest = thisIsNew.getProjection();
alert(newest);

I never get an alert and on the console I see that "the object does not support that method", for both of the above ways.

What am I missing?

Thanks in advance

Answer 1

getProjection() method normally works with openlayers map object not with bounds and thats the reason you are getting "the object does not support that method" in console window.

Secondly to validate coordinates for EPSG:4326 (range between -180 to 180 and -90 to 90) you can simply javascript code to verify user input.

var x1 = ba; //input value from user

var y1 = bb; //input value from user

var x2 = bc; //input value from user

var y2 = bd; //input value from user

valid_x1 = false;

valid_x2 = false;

valid_y1 = false;

valid_y2 = false;

if (x1 >= -180 && x1 <= 180) {

    valid_x1 = true;

}
if (x2 >= -180 && x2 <= 180) {

    valid_x2 = true;

}

if (y1 >= -90 && y1 <= 90) {

    valid_y1 = true;

}

if (y2 >= -90 && y2 <= 90) {

    valid_y2 = true;

}

if (valid_x1 && valid_x2 && valid_y1 && valid_y2) {

    console.log("Correct Projection");

} else {

    console.log("Wrong projection, insert only EPSG4326");
}