gw-count-sundays.js: Added a new snippet.

experimental/gw-count-sundays.js

@@ -0,0 +1,59 @@
+/**
+ * Gravity Wiz // Gravity Forms // Count Number of Sundays Between Two Dates
+ * https://gravitywiz.com/path/to/article/
+ *
+ * Use this snippet to count the number of Sundays between a start and end date, including those dates themselves.
+ * 
+ * Note: This is a JavaScript snippet and there is no server-side validation to ensure that the calculated value
+ * has not been tampered with prior to submission.
+ *
+ * Instructions:
+ *
+ * 1. Install this snippet with our free Custom JavaScript plugin.
+ *    https://gravitywiz.com/gravity-forms-custom-javascript/
+ * 
+ * 2. Update the required field IDs to match your own by following the inline instructions.
+ */
+// Update "1" with the ID of your start Date field.
+const startDateField = document.getElementById('input_GFFORMID_1');
+
+// Update "2" with the ID of your end Date field.
+const endDateField = document.getElementById('input_GFFORMID_2');
+
+// Update "3" with the ID of your Sunday count field.
+const countField = document.getElementById('input_GFFORMID_3');
+
+function calculateSundays() {
+	const startDate = new Date(startDateField.value);
+	const endDate = new Date(endDateField.value);
+	let sundays = 0;
+
+	// Loop through the dates and count Sundays
+	while (startDate <= endDate) {
+		if (startDate.getDay() === 0) { // Sunday is represented by 0 in JavaScript's getDay() function
+			sundays++;
+		}
+		startDate.setDate(startDate.getDate() + 1); // Move to the next day
+	}
+
+	return sundays;
+}
+function updateSundayCount() {
+	countField.value = calculateSundays();
+}
+
+// Update Sunday count each time a date is manually entered.
+startDateField.addEventListener('change', updateSundayCount);
+endDateField.addEventListener('change', updateSundayCount);
+
+// Update Sunday count each time a date is selected via the Datepicker.
+gform.addFilter( 'gform_datepicker_options_pre_init', function( optionsObj, formId, fieldId ) {
+	var origOnSelect = optionsObj.onSelect;
+	optionsObj.onSelect = function( value, dpObject ) {
+		if ( origOnSelect ) {
+			origOnSelect();
+		}
+		updateSundayCount()
+	}
+	return optionsObj;
+} );