Method _initialCaretPosition

src/AutoNumeric.js:5514–5694

* Calculate where to put the caret position on focus if the element content is not selected. * This calculation is affected by the `caretPositionOnFocus` option which can be either `null`, `'start'`, `'end'`, `'decimalLeft'` or 'decimalRight'`, and will decide where to put the caret (on the lef

(value)

     * @private
     */
    _initialCaretPosition(value) {
        if (AutoNumericHelper.isNull(this.settings.caretPositionOnFocus) &&
            this.settings.selectOnFocus === AutoNumeric.options.selectOnFocus.doNotSelect) {
            AutoNumericHelper.throwError('`_initialCaretPosition()` should never be called when the `caretPositionOnFocus` option is `null`.');
        }

        const isValueNegative = this.rawValue < 0;
        const isZeroOrHasNoValue = AutoNumericHelper.isZeroOrHasNoValue(value);
        const totalLength = value.length;

        let valueSize = 0;
        let integerSize = 0;
        let hasDecimalChar = false;
        let offsetDecimalChar = 0;
        if (this.settings.caretPositionOnFocus !== AutoNumeric.options.caretPositionOnFocus.start) {
            value = value.replace(this.settings.negativeSignCharacter, '');
            value = value.replace(this.settings.positiveSignCharacter, '');
            value = value.replace(this.settings.currencySymbol, '');
            valueSize = value.length;
            hasDecimalChar = AutoNumericHelper.contains(value, this.settings.decimalCharacter);

            if (this.settings.caretPositionOnFocus === AutoNumeric.options.caretPositionOnFocus.decimalLeft ||
                this.settings.caretPositionOnFocus === AutoNumeric.options.caretPositionOnFocus.decimalRight) {
                if (hasDecimalChar) {
                    integerSize = value.indexOf(this.settings.decimalCharacter);
                    offsetDecimalChar = this.settings.decimalCharacter.length;
                } else {
                    integerSize = valueSize;
                    offsetDecimalChar = 0;
                }
            }
        }

        let signToUse = '';
        if (isValueNegative) {
            signToUse = this.settings.negativeSignCharacter;
        } else if (this.settings.showPositiveSign && !isZeroOrHasNoValue) {
            signToUse = this.settings.positiveSignCharacter;
        }

        const positiveNegativeSignSize = signToUse.length;
        const currencySymbolSize = this.settings.currencySymbol.length;

        // Calculate the caret position based on `currencySymbolPlacement`, `negativePositiveSignPlacement` and `caretPositionOnFocus`
        let caretPosition;
        if (this.settings.currencySymbolPlacement === AutoNumeric.options.currencySymbolPlacement.prefix) {
            if (this.settings.caretPositionOnFocus === AutoNumeric.options.caretPositionOnFocus.start) {
                if (this.settings.negativePositiveSignPlacement !== AutoNumeric.options.negativePositiveSignPlacement.none &&
                    (isValueNegative || (!isValueNegative && this.settings.showPositiveSign && !isZeroOrHasNoValue))) {
                    switch (this.settings.negativePositiveSignPlacement) {
                        case AutoNumeric.options.negativePositiveSignPlacement.prefix: // +€|12.34
                        case AutoNumeric.options.negativePositiveSignPlacement.left:   // +€|12.34
                        case AutoNumeric.options.negativePositiveSignPlacement.right:  // €+|12.34
                            caretPosition = positiveNegativeSignSize + currencySymbolSize;
                            break;
                        case AutoNumeric.options.negativePositiveSignPlacement.suffix: // €|12.34+
                            caretPosition = currencySymbolSize;
                            break;