added support for setting a minimum number of selections in a check group

validation.js

@@ -6,6 +6,7 @@ class ValidationField {
     labelText = null
     message = null
     messageOutputted = null
+    minCount = null
     optional = false
     pattern = null
     patternMessage = null
@@ -93,6 +94,23 @@ class ValidationField {
             // add a native pattern attr if pattern property is present
             if (this.pattern) this.el.setAttribute('pattern', this.pattern)
 
+            // track minimum selections for checkboxes; todo: add multiple attr support
+            if (this.el.type === 'checkbox') {
+                if (!this.validationInstance.multi.hasOwnProperty(this.el.name)) {
+                    this.validationInstance.multi[this.el.name] = {}
+                    // this.validationInstance.multi[this.el.name].count = 0
+                    this.validationInstance.multi[this.el.name].minCount = this.minCount ?? 1
+                }
+
+                // if (this.el.checked) this.validationInstance.multi[this.el.name].count++
+
+                // this.el.addEventListener('change', () => {
+                //     this.el.checked
+                //         ? this.validationInstance.multi[this.el.name].count++
+                //         : this.validationInstance.multi[this.el.name].count--
+                // })
+            }
+
             // add required indicator
             if (this.validationInstance.reqIndicators) {
                 const hasIndicator = this.formGroupEl?.querySelector(`.${this.validationInstance.reqIndicatorClass}`)
@@ -121,6 +139,7 @@ class Validation {
     form = null
     invalidClass = 'invalid'
     messageClass = 'invalid__message'
+    multi = []
     onlyOnSubmit = false
     onSuccess = null
     passConfirm = true
@@ -309,8 +328,12 @@ class Validation {
     }
 
     validateCheckbox(fieldInstance, nameAttrVal) {
-        if (!this.form.querySelector(`[name="${nameAttrVal}"]:checked`)) {
-            this.addError(fieldInstance, `At least one choice is required.`)
+        let messageMod = fieldInstance.validationInstance.multi[`${nameAttrVal}`].minCount === 1 ? `choice is` : `choices are`
+        let message = `At least ${fieldInstance.validationInstance.multi[`${nameAttrVal}`].minCount} ${messageMod} required.`
+
+        if (this.form.querySelectorAll(`[name="${nameAttrVal}"]:checked`).length <
+            fieldInstance.validationInstance.multi[`${nameAttrVal}`].minCount) {
+            this.addError(fieldInstance, message)
         }
     }