Add clearableValue option for Multi-Select

README.md

@@ -89,6 +89,14 @@ You can enable multi-value selection by setting `multi={true}`. In this mode:
 * The `onChange` event provides an array of the selected options as the second argument
 * The first argument to `onChange` is always a string, regardless of whether the values of the selected options are numbers or strings
 * By default, only options in the `options` array can be selected. Setting `allowCreate` to true allows new options to be created if they do not already exist.
+* By default, selected options can be cleared. To disable the possibility of clearing a particular option, add `clearableValue: false` to that option:
+```javascript
+var options = [
+	{ value: 'one', label: 'One' },
+	{ value: 'two', label: 'Two', clearableValue: false }
+];
+```
+Note: the `clearable` prop of the Select component should also be set to `false` to prevent allowing clearing all fields at once
 
 ### Async options
 

src/Select.js

@@ -348,6 +348,7 @@ const Select = React.createClass({
 	popValue () {
 		var valueArray = this.getValueArray();
 		if (!valueArray.length) return;
+		if (valueArray[valueArray.length-1].clearableValue === false) return;
 		this.setValue(valueArray.slice(0, valueArray.length - 1));
 	},
 
@@ -449,7 +450,7 @@ const Select = React.createClass({
 			return valueArray.map((value, i) => {
 				return (
 					<ValueComponent
-						disabled={this.props.disabled}
+						disabled={this.props.disabled || value.clearableValue === false}
 						key={`value-${i}-${value[this.props.valueKey]}`}
 						onClick={onClick}
 						onRemove={this.removeValue}

test/Select-test.js

@@ -1542,7 +1542,7 @@ describe('Select', () => {
 
 			options = [
 				{ value: 'one', label: 'One' },
-				{ value: 'two', label: 'Two' },
+				{ value: 'two', label: 'Two', clearableValue: false },
 				{ value: 'three', label: 'Three' },
 				{ value: 'four', label: 'Four' }
 			];
@@ -1660,6 +1660,29 @@ describe('Select', () => {
 			]);
 		});
 
+		it('doesn\'t show the X if clearableValue=false', () => {
+
+			setValueProp(['two']);
+			onChange.reset();  // Ignore previous onChange calls
+
+			var twoDeleteButton = ReactDOM.findDOMNode(instance).querySelectorAll('.Select-value-icon')[0];
+
+			expect(twoDeleteButton, 'to be', undefined);
+		});
+
+		it('doesn\'t allow clearing with backspace if clearableValue=false on the latest element', () => {
+
+			setValueProp(['four', 'two']);
+			onChange.reset();  // Ignore previous onChange calls
+
+			pressBackspace();
+			expect(onChange, 'was not called');
+			var items = ReactDOM.findDOMNode(instance).querySelectorAll('.Select-value-label');
+			expect(items[0], 'to have text', 'Four');
+			expect(items[1], 'to have text', 'Two');
+
+		});
+
 		describe('with late options', () => {
 
 			beforeEach(() => {