1 files changed, 24 insertions, 13 deletions
diff --git a/packages/instant/src/components/amount_input.tsx b/packages/instant/src/components/amount_input.tsx
index 699541bfb..8fead78ca 100644
--- a/packages/instant/src/components/amount_input.tsx
+++ b/packages/instant/src/components/amount_input.tsx
@@ -1,4 +1,5 @@
 import { BigNumber } from '@0xproject/utils';
+import * as _ from 'lodash';
 import * as React from 'react';
 
 import { ColorOption } from '../style/theme';
@@ -12,16 +13,26 @@ export interface AmountInputProps {
     onChange?: (value: BigNumber) => void;
 }
 
-export const AmountInput: React.StatelessComponent<AmountInputProps> = props => (
-    <Container borderBottom="1px solid rgba(255,255,255,0.3)" display="inline-block">
-        <Input
-            fontColor={props.fontColor}
-            fontSize={props.fontSize}
-            value={props.value ? props.value.toString() : undefined}
-            placeholder="0.00"
-            width="2em"
-        />
-    </Container>
-);
-
-AmountInput.defaultProps = {};
+export class AmountInput extends React.Component<AmountInputProps> {
+    public render(): React.ReactNode {
+        const { fontColor, fontSize, value } = this.props;
+        return (
+            <Container borderBottom="1px solid rgba(255,255,255,0.3)" display="inline-block">
+                <Input
+                    fontColor={fontColor}
+                    fontSize={fontSize}
+                    onChange={this._handleChange}
+                    value={value ? value.toString() : undefined}
+                    placeholder="0.00"
+                    width="2em"
+                />
+            </Container>
+        );
+    }
+    private _handleChange = (event: React.ChangeEvent<HTMLInputElement>): void => {
+        const bigNumberValue = new BigNumber(event.target.value);
+        if (!_.isUndefined(this.props.onChange)) {
+            this.props.onChange(bigNumberValue);
+        }
+    };
+}