javascript/jquery recipes

javascript.js

// Convert array to object
var rnxSearch = formDataArray.reduce(function (o, val) { o[val.name] = val.value; return o; }, {});

// Round float
return Number(myfloat).toFixed(2);

/**************************************************
                    Forms
***************************************************/
// Check a radio
$("#xradio").prop('checked', true);

// Get field values
var startD = $('#formOptions').find('input[name="startdate"]').val();
var period = $('#formOptions').find('input[name="fileperiod"]:checked').val(); // checkbox

// Reset all form fields
<form id="formOptions">
  <button type="reset">Reset</button>
</form>
...
$('#formOptions').trigger("reset");

// Get form values when submitting
<form id="formOptions">
  <button type="submit">Draw chart</button>
</form>
...
$("#formOptions").on("submit", function (event) {
  event.preventDefault();
  //var formData = $(this).serializeArray();
  var formInputStr = $(this).serialize();
  ...
}
  
/**************************************************
                    Dates
***************************************************/
// add one day
myDate.setDate(myDate.getDate() + 1);
  
// copy date
var date1 = new Date(); // new Date object containing the current date and time
var copiedDate = new Date(date1.getTime());
  
if (myDate.getTime() < Date.now()) { }

  
/**************************************************
                  Carto functions
***************************************************/
const rho = 180 / Math.PI,

// WGS-84
const ae = 6378137.000,
const be = 6356752.3142,
const ef = (Math.pow(6378137.000, 2) - Math.pow(6356752.3142, 2)) / Math.pow(6378137.000, 2),
const es = (Math.pow(6378137.000, 2) - Math.pow(6356752.3142, 2)) / Math.pow(6356752.3142, 2),

      /*
 * xyzEll - convert cartesian coordinates to geographic coordinates 
 *
 * xyzEll(x,y,z,[typ]) 
 * ------------------------------------------------------------------------
 * Arguments  Description                                           Default
 * ------------------------------------------------------------------------
 * x          Geocentric cartesian X coordinate
 * Y          Geocentric cartesian Y coordinate
 * Z          Geocentric cartesian Z coordinate
 * typ        Radians ('r') or degree ('d')                         d       
 */
function xyzEll(x, y, z, typ) {
  typ = typeof typ !== 'undefined' ? typ : 'd';

  // Special locations (geocenter, pole)
  if (x == 0 && y == 0 && z == 0) { return [0, 0, 0] };
  if (x == 0 && y == 0 && z > 0) {
    return typ === 'r' ? [90 / this.rho, 0, z - this.be] : [90, 0, z - this.be];
  }
  if (x == 0 && y == 0 && z < 0) {
    return typ === 'r' ? [-90 / this.rho, 0, -z - this.be] : [-90, 0, -z - this.be];
  }

  // Auxiliary quantities
  const p = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));
  const t = Math.atan2(z * this.ae, p * this.be);

  // Latitude and longitude
  const lam = Math.atan2(y, x);
  const phi = Math.atan2(z + this.es * this.be * Math.pow(Math.sin(t), 3), p - this.ef * this.ae * Math.pow(Math.cos(t), 3));

  if (isNaN(lam) || isNaN(phi)) {
    console.error('lam or phi is not a number');
    return [0, 0, 0];
  }

  // Auxiliary quantity
  const n = Math.pow(this.ae, 2) / Math.sqrt(Math.pow(this.ae, 2) * Math.pow(Math.cos(phi), 2) + Math.pow(this.be, 2) * Math.pow(Math.sin(phi), 2));

  // Height
  const h = p / Math.cos(phi) - n;

  return typ === 'r' ? [phi, lam, h] : [phi * this.rho, lam * this.rho, h];
}