gethue/ko/extenders/ko.numeric.js

Hue is an Open source SQL Query Editor for Databases/Warehouses

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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
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import * as ko from 'knockout';

ko.extenders.numeric = function (target, config) {
  const precision = typeof config.precision === 'undefined' ? config : config.precision;
  const roundingMultiplier = Math.pow(10, precision);

  const result = ko
    .computed({
      read: target,
      write: function (newValue) {
        const current = target();
        const newValueAsNum = isNaN(newValue) ? 0 : parseFloat(+newValue);
        let valueToWrite = Math.round(newValueAsNum * roundingMultiplier) / roundingMultiplier;

        if (newValue === '' && config.allowEmpty) {
          valueToWrite = newValue;
        }
        if (valueToWrite !== current) {
          target(valueToWrite);
        } else if (newValue !== current) {
          target.notifySubscribers(valueToWrite);
        }
      }
    })
    .extend({ notify: 'always' });
  result(target());
  return result;
};