diff --git a/relog-web/src/Button.js b/relog-web/src/Button.js
index e6dc850..7ffb84b 100644
--- a/relog-web/src/Button.js
+++ b/relog-web/src/Button.js
@@ -1,22 +1,22 @@
-import styles from './Button.module.css'
+import styles from './Button.module.css';
 
 const Button = (props) => {
-    let className = styles.Button
+    let className = styles.Button;
     if (props.kind === "inline") {
-        className += " " + styles.inline
+        className += " " + styles.inline;
     }
 
     let tooltip = "";
     if (props.tooltip != undefined) {
-        tooltip = <span className={styles.tooltip}>{props.tooltip}</span>
+        tooltip = <span className={styles.tooltip}>{props.tooltip}</span>;
     }
 
     return (
-        <button className={className}>
+        <button className={className} onClick={props.onClick}>
             {tooltip}
             {props.label}
         </button>
-    )
-}
+    );
+};
 
 export default Button;
\ No newline at end of file
diff --git a/relog-web/src/ButtonRow.js b/relog-web/src/ButtonRow.js
index ba4db2b..db3afcd 100644
--- a/relog-web/src/ButtonRow.js
+++ b/relog-web/src/ButtonRow.js
@@ -1,7 +1,7 @@
-import styles from './ButtonRow.module.css'
+import styles from './ButtonRow.module.css';
 
 const ButtonRow = (props) => {
-    return <div className={styles.ButtonRow}>{props.children}</div>
-}
+    return <div className={styles.ButtonRow}>{props.children}</div>;
+};
 
 export default ButtonRow;
\ No newline at end of file
diff --git a/relog-web/src/Card.js b/relog-web/src/Card.js
index 8e56615..5a2a14a 100644
--- a/relog-web/src/Card.js
+++ b/relog-web/src/Card.js
@@ -1,7 +1,7 @@
-import styles from './Card.module.css'
+import styles from './Card.module.css';
 
 const Card = (props) => {
-    return (<div className={styles.Card}>{props.children}</div>)
-}
+    return (<div className={styles.Card}>{props.children}</div>);
+};
 
 export default Card;
\ No newline at end of file
diff --git a/relog-web/src/DictInputRow.js b/relog-web/src/DictInputRow.js
index 482b59d..5ce6973 100644
--- a/relog-web/src/DictInputRow.js
+++ b/relog-web/src/DictInputRow.js
@@ -1,27 +1,37 @@
-import form_styles from './Form.module.css'
-import Button from './Button'
+import { useState } from 'react';
+import form_styles from './Form.module.css';
+import Button from './Button';
 
 const DictInputRow = (props) => {
+    const dict = { ...props.value };
+    if (!props.disableKeys) {
+        dict[""] = "";
+    }
+
     let unit = "";
     if (props.unit) {
-        unit = <span className={form_styles.FormRow_unit}>({props.unit})</span>
+        unit = <span className={form_styles.FormRow_unit}>({props.unit})</span>;
     }
 
     let tooltip = "";
     if (props.tooltip != undefined) {
-        tooltip = <Button label="?" kind="inline" tooltip={props.tooltip} />
+        tooltip = <Button label="?" kind="inline" tooltip={props.tooltip} />;
     }
 
-    let value = {}
-    if (props.value != undefined) {
-        value = props.value;
-    }
-    if (props.disableKeys === undefined) {
-        value[""] = "";
-    }
+    const onChangeValue = (key, v) => {
+        const newDict = { ...dict };
+        newDict[key] = v;
+        props.onChange(newDict);
+    };
 
-    const form = []
-    Object.keys(value).forEach((key, index) => {
+    const onChangeKey = (prevKey, newKey) => {
+        const newDict = renameKey(dict, prevKey, newKey);
+        if (!("" in newDict)) newDict[""] = "";
+        props.onChange(newDict);
+    };
+
+    const form = [];
+    Object.keys(dict).forEach((key, index) => {
         let label = <span>{props.label} {unit}</span>;
         if (index > 0) {
             label = "";
@@ -35,21 +45,33 @@ const DictInputRow = (props) => {
                     value={key}
                     placeholder={props.keyPlaceholder}
                     disabled={props.disableKeys}
+                    onChange={e => onChangeKey(key, e.target.value)}
                 />
                 <input
                     type="text"
                     data-index={index}
-                    value={value[key]}
+                    value={dict[key]}
                     placeholder={props.valuePlaceholder}
+                    onChange={e => onChangeValue(key, e.target.value)}
                 />
                 {tooltip}
             </div>
         );
     });
 
-    return <>
-        {form}
-    </>;
+    return <>{form}</>;
+};
+
+function renameKey(obj, prevKey, newKey) {
+    const keys = Object.keys(obj);
+    return keys.reduce((acc, val) => {
+        if (val === prevKey) {
+            acc[newKey] = obj[prevKey];
+        } else {
+            acc[val] = obj[val];
+        }
+        return acc;
+    }, {});
 }
 
 export default DictInputRow;
\ No newline at end of file
diff --git a/relog-web/src/FileInputRow.js b/relog-web/src/FileInputRow.js
index 8d2e9b2..71239a9 100644
--- a/relog-web/src/FileInputRow.js
+++ b/relog-web/src/FileInputRow.js
@@ -1,11 +1,11 @@
-import form_styles from './Form.module.css'
-import Button from './Button'
+import form_styles from './Form.module.css';
+import Button from './Button';
 
 const FileInputRow = (props) => {
 
     let tooltip = "";
     if (props.tooltip != undefined) {
-        tooltip = <Button label="?" kind="inline" tooltip={props.tooltip} />
+        tooltip = <Button label="?" kind="inline" tooltip={props.tooltip} />;
     }
 
     return <div className={form_styles.FormRow}>
@@ -16,6 +16,6 @@ const FileInputRow = (props) => {
         <Button label="Template" kind="inline" />
         {tooltip}
     </div>;
-}
+};
 
 export default FileInputRow;
\ No newline at end of file
diff --git a/relog-web/src/Footer.js b/relog-web/src/Footer.js
index c4bcf29..e87b31c 100644
--- a/relog-web/src/Footer.js
+++ b/relog-web/src/Footer.js
@@ -1,10 +1,10 @@
-import styles from './Footer.module.css'
+import styles from './Footer.module.css';
 
 const Footer = () => {
     return <div className={styles.Footer}>
         <p>RELOG: Reverse Logistics Optimization</p>
         <p>Copyright &copy; 2020&mdash;2022, UChicago Argonne, LLC. All Rights Reserved.</p>
-    </div>
-}
+    </div>;
+};
 
 export default Footer;
\ No newline at end of file
diff --git a/relog-web/src/Form.js b/relog-web/src/Form.js
index 721df52..e2c4607 100644
--- a/relog-web/src/Form.js
+++ b/relog-web/src/Form.js
@@ -1,5 +1,5 @@
 const Form = (props) => {
     return <>{props.children}</>;
-}
+};
 
 export default Form;
\ No newline at end of file
diff --git a/relog-web/src/Header.js b/relog-web/src/Header.js
index 18a2294..ff0f9b5 100644
--- a/relog-web/src/Header.js
+++ b/relog-web/src/Header.js
@@ -1,4 +1,4 @@
-import styles from './Header.module.css'
+import styles from './Header.module.css';
 
 const Header = () => {
     return (
@@ -7,7 +7,7 @@ const Header = () => {
                 <h1>RELOG</h1>
             </div>
         </div>
-    )
-}
+    );
+};
 
 export default Header;
\ No newline at end of file
diff --git a/relog-web/src/InputPage.js b/relog-web/src/InputPage.js
index f5c8fdd..9edd5d9 100644
--- a/relog-web/src/InputPage.js
+++ b/relog-web/src/InputPage.js
@@ -1,4 +1,5 @@
-import React from 'react';
+import React, { useState } from 'react';
+
 import './index.css';
 import PipelineBlock from './PipelineBlock';
 import ParametersBlock from './ParametersBlock';
@@ -7,20 +8,249 @@ import PlantBlock from './PlantBlock';
 import ButtonRow from './ButtonRow';
 import Button from './Button';
 
+const defaultData = {
+    parameters: {
+        "time horizon (years)": "1",
+        "building period (years)": "[1]",
+        "annual inflation rate (%)": "0.0",
+    },
+    products: {
+    },
+    plants: {
+    }
+};
+
+const defaultProduct = {
+    "acquisition cost ($/tonne)": "0.00",
+    "disposal cost ($/tonne)": "0.00",
+    "disposal limit (tonne)": "0",
+    "transportation cost ($/km/tonne)": "0.00",
+    "transportation energy (J/km/tonne)": "0",
+    "transportation emissions (J/km/tonne)": {
+        "CO2": 0,
+        "NH2": 0,
+    }
+};
+
+const randomPosition = () => {
+    return Math.round(Math.random() * 30) * 15;
+};
 
 const InputPage = () => {
+    let [data, setData] = useState(defaultData);
+
+    // onAdd
+    // ------------------------------------------------------------------------
+    const promptName = (prevData) => {
+        const name = prompt("Name");
+        if (!name || name.length == 0) return;
+        if (name in prevData.products || name in prevData.plants) return;
+        return name;
+    };
+
+    const onAddPlant = () => {
+        setData((prevData) => {
+            const name = promptName(prevData);
+            if (name === undefined) return prevData;
+            const newData = { ...prevData };
+            newData.plants[name] = {
+                x: randomPosition(),
+                y: randomPosition(),
+                outputs: {},
+            };
+            return newData;
+        });
+    };
+
+    const onAddProduct = () => {
+        setData((prevData) => {
+            const name = promptName(prevData);
+            if (name === undefined) return prevData;
+            const newData = { ...prevData };
+            newData.products[name] = {
+                ...defaultProduct,
+                x: randomPosition(),
+                y: randomPosition(),
+            };
+            return newData;
+        });
+    };
+
+    // onRename
+    // ------------------------------------------------------------------------
+    const onRenamePlant = (prevName, newName) => {
+        setData((prevData) => {
+            const newData = { ...prevData };
+            newData.plants[newName] = newData.plants[prevName];
+            delete newData.plants[prevName];
+            return newData;
+        });
+    };
+
+    const onRenameProduct = (prevName, newName) => {
+        setData((prevData) => {
+            const newData = { ...prevData };
+            newData.products[newName] = newData.products[prevName];
+            delete newData.products[prevName];
+            for (const [plantName, plant] of Object.entries(newData.plants)) {
+                if (plant.input == prevName) {
+                    plant.input = newName;
+                }
+                let outputFound = false;
+                for (const [outputName, outputValue] of Object.entries(plant.outputs)) {
+                    if (outputName == prevName) outputFound = true;
+                }
+                if (outputFound) {
+                    plant.outputs[newName] = plant.outputs[prevName];
+                    delete plant.outputs[prevName];
+                }
+            }
+            return newData;
+        });
+    };
+
+    // onMove
+    // ------------------------------------------------------------------------
+    const onMovePlant = (plantName, x, y) => {
+        setData((prevData) => {
+            const newData = { ...prevData };
+            newData.plants[plantName].x = x;
+            newData.plants[plantName].y = y;
+            return newData;
+        });
+    };
+
+    const onMoveProduct = (productName, x, y) => {
+        setData((prevData) => {
+            const newData = { ...prevData };
+            newData.products[productName].x = x;
+            newData.products[productName].y = y;
+            return newData;
+        });
+    };
+
+    // onRemove
+    // ------------------------------------------------------------------------
+    const onRemovePlant = (plantName) => {
+        setData((prevData) => {
+            const newData = { ...prevData };
+            delete newData.plants[plantName];
+            return newData;
+        });
+    };
+
+    const onRemoveProduct = (productName) => {
+        setData((prevData) => {
+            const newData = { ...prevData };
+            delete newData.products[productName];
+            for (const [plantName, plant] of Object.entries(newData.plants)) {
+                if (plant.input == productName) {
+                    delete plant.input;
+                }
+                let outputFound = false;
+                for (const [outputName, outputValue] of Object.entries(plant.outputs)) {
+                    if (outputName == productName) outputFound = true;
+                }
+                if (outputFound) {
+                    delete plant.outputs[productName];
+                }
+            }
+            return newData;
+        });
+    };
+
+    // Inputs & Outputs
+    // ------------------------------------------------------------------------
+    const onSetPlantInput = (plantName, productName) => {
+        setData((prevData) => {
+            const newData = { ...prevData };
+            newData.plants[plantName].input = productName;
+            return newData;
+        });
+    };
+
+    const onAddPlantOutput = (plantName, productName) => {
+        setData((prevData) => {
+            if (productName in prevData.plants[plantName].outputs) {
+                return prevData;
+            }
+            const newData = { ...prevData };
+            newData.plants[plantName].outputs[productName] = 0;
+            return newData;
+        });
+
+    };
+
+    // onSave
+    // ------------------------------------------------------------------------
+    const onSave = () => {
+        console.log(data);
+    };
+
+    // onChange
+    // ------------------------------------------------------------------------
+    const onChangeParameters = (val) => {
+        setData(prevData => {
+            const newData = { ...prevData };
+            newData.parameters = val;
+            return newData;
+        });
+    };
+
+    const onChangeProduct = (prodName, val) => {
+        setData(prevData => {
+            const newData = { ...prevData };
+            newData.products[prodName] = val;
+            return newData;
+        });
+    };
+
+    // ------------------------------------------------------------------------
+    let productComps = [];
+    for (const [prodName, prod] of Object.entries(data.products)) {
+        productComps.push(
+            <ProductBlock
+                key={prodName}
+                name={prodName}
+                value={prod}
+                onChange={v => onChangeProduct(prodName, v)}
+            />
+        );
+    }
+
+    let plantComps = [];
+    for (const [plantName, plant] of Object.entries(data.plants)) {
+        plantComps.push(
+            <PlantBlock key={plantName} name={plantName} />
+        );
+    }
+
     return <>
-        <PipelineBlock />
-        <ParametersBlock />
-        <ProductBlock name="Battery" />
-        <ProductBlock name="Nickel" />
-        <ProductBlock name="Metal casing" />
-        <PlantBlock name="Battery Recycling Plant" />
+        <PipelineBlock
+            onAddPlant={onAddPlant}
+            onAddPlantOutput={onAddPlantOutput}
+            onAddProduct={onAddProduct}
+            onMovePlant={onMovePlant}
+            onMoveProduct={onMoveProduct}
+            onRenamePlant={onRenamePlant}
+            onRenameProduct={onRenameProduct}
+            onSetPlantInput={onSetPlantInput}
+            onRemovePlant={onRemovePlant}
+            onRemoveProduct={onRemoveProduct}
+            plants={data.plants}
+            products={data.products}
+        />
+        <ParametersBlock
+            value={data.parameters}
+            onChange={onChangeParameters}
+        />
+        {productComps}
+        {plantComps}
         <ButtonRow>
             <Button label="Load" />
-            <Button label="Save" />
+            <Button label="Save" onClick={onSave} />
         </ButtonRow>
-    </>
-}
+    </>;
+};
 
 export default InputPage;
\ No newline at end of file
diff --git a/relog-web/src/ParametersBlock.js b/relog-web/src/ParametersBlock.js
index e961be5..57fb950 100644
--- a/relog-web/src/ParametersBlock.js
+++ b/relog-web/src/ParametersBlock.js
@@ -1,9 +1,13 @@
-import Section from './Section'
-import Card from './Card'
-import Form from './Form'
-import TextInputRow from './TextInputRow'
+import Section from './Section';
+import Card from './Card';
+import Form from './Form';
+import TextInputRow from './TextInputRow';
 
-const ParametersBlock = () => {
+const ParametersBlock = (props) => {
+    const onChangeField = (field, val) => {
+        props.value[field] = val;
+        props.onChange(props.value);
+    };
     return (
         <>
             <Section title="Parameters" />
@@ -13,24 +17,27 @@ const ParametersBlock = () => {
                         label="Time horizon"
                         unit="years"
                         tooltip="Number of years in the simulation."
-                        default="1"
+                        value={props.value["time horizon (years)"]}
+                        onChange={v => onChangeField("time horizon (years)", v)}
                     />
                     <TextInputRow
                         label="Building period"
                         unit="years"
                         tooltip="List of years in which we are allowed to open new plants. For example, if this parameter is set to [1,2,3], we can only open plants during the first three years. By default, this equals [1]; that is, plants can only be opened during the first year."
-                        default="[1]"
+                        value={props.value["building period (years)"]}
+                        onChange={v => onChangeField("building period (years)", v)}
                     />
                     <TextInputRow
                         label="Annual inflation rate"
                         unit="%"
                         tooltip="Rate of inflation applied to all costs."
-                        default="0"
+                        value={props.value["annual inflation rate (%)"]}
+                        onChange={v => onChangeField("annual inflation rate (%)", v)}
                     />
                 </Form>
             </Card>
         </>
-    )
-}
+    );
+};
 
 export default ParametersBlock;
\ No newline at end of file
diff --git a/relog-web/src/PipelineBlock.js b/relog-web/src/PipelineBlock.js
index 977bd33..2162f9e 100644
--- a/relog-web/src/PipelineBlock.js
+++ b/relog-web/src/PipelineBlock.js
@@ -5,83 +5,138 @@ import Card from './Card';
 import Button from './Button';
 import styles from './PipelineBlock.module.css';
 
-const elements = [
-    {
-        id: '1',
-        data: { label: 'Battery' },
-        sourcePosition: 'right',
-        targetPosition: 'left',
-        position: { x: 100, y: 200 },
-        className: styles.ProductNode,
-    },
-    {
-        id: '2',
-        data: { label: "Battery Recycling Plant" },
-        sourcePosition: 'right',
-        targetPosition: 'left',
-        position: { x: 500, y: 150 },
-        className: styles.PlantNode,
-    },
-    {
-        id: '3',
-        data: { label: 'Nickel' },
-        sourcePosition: 'right',
-        targetPosition: 'left',
-        position: { x: 900, y: 100 },
-        className: styles.ProductNode,
-    },
-    {
-        id: '4',
-        data: { label: 'Metal casing' },
-        sourcePosition: 'right',
-        targetPosition: 'left',
-        position: { x: 900, y: 300 },
-        className: styles.ProductNode,
-    },
-    {
-        id: 'e1-2',
-        source: '1',
-        target: '2',
-        animated: true,
-        selectable: false,
-        style: { stroke: "black" },
-    },
-    {
-        id: 'e2-3',
-        source: '2',
-        target: '3',
-        animated: true,
-        selectable: false,
-        style: { stroke: "black" },
-    },
-    {
-        id: 'e2-4',
-        source: '2',
-        target: '4',
-        animated: true,
-        selectable: false,
-        style: { stroke: "black" },
-    },
 
-];
+const PipelineBlock = (props) => {
+    let elements = [];
+    let mapNameToType = {};
+    for (const [productName, product] of Object.entries(props.products)) {
+        mapNameToType[productName] = "product";
+        elements.push({
+            id: productName,
+            data: { label: productName, type: 'product' },
+            position: { x: product.x, y: product.y },
+            sourcePosition: 'right',
+            targetPosition: 'left',
+            className: styles.ProductNode,
+        });
+    }
+
+    for (const [plantName, plant] of Object.entries(props.plants)) {
+        mapNameToType[plantName] = "plant";
+        elements.push({
+            id: plantName,
+            data: { label: plantName, type: 'plant' },
+            position: { x: plant.x, y: plant.y },
+            sourcePosition: 'right',
+            targetPosition: 'left',
+            className: styles.PlantNode,
+        });
+
+        if (plant.input != undefined) {
+            elements.push({
+                id: `${plant.input}-${plantName}`,
+                source: plant.input,
+                target: plantName,
+                animated: true,
+                style: { stroke: "black" },
+                selectable: false,
+            });
+        }
+
+        for (const [productName, amount] of Object.entries(plant.outputs)) {
+            elements.push({
+                id: `${plantName}-${productName}`,
+                source: plantName,
+                target: productName,
+                animated: true,
+                style: { stroke: "black" },
+                selectable: false,
+            });
+        }
+
+    }
+
+    const onNodeDoubleClick = (ev, node) => {
+        const oldName = node.data.label;
+        const newName = window.prompt("Enter new name", oldName);
+        if (newName == undefined || newName.length == 0) return;
+        if (newName in mapNameToType) return;
+        if (node.data.type == "plant") {
+            props.onRenamePlant(oldName, newName);
+        } else {
+            props.onRenameProduct(oldName, newName);
+        }
+    };
+
+    const onElementsRemove = (elements) => {
+        elements.forEach(el => {
+            if (!(el.id in mapNameToType)) return;
+            if (el.data.type == "plant") {
+                props.onRemovePlant(el.data.label);
+            } else {
+                props.onRemoveProduct(el.data.label);
+            }
+        });
+    };
+
+    const onNodeDragStop = (ev, node) => {
+        if (node.data.type == "plant") {
+            props.onMovePlant(node.data.label, node.position.x, node.position.y);
+        } else {
+            props.onMoveProduct(node.data.label, node.position.x, node.position.y);
+        }
+    };
+
+    const onConnect = (args) => {
+        const sourceType = mapNameToType[args.source];
+        const targetType = mapNameToType[args.target];
+        if (sourceType === "product" && targetType === "plant") {
+            props.onSetPlantInput(args.target, args.source);
+        } else if (sourceType === "plant" && targetType === "product") {
+            props.onAddPlantOutput(args.source, args.target);
+        }
+    };
 
-const PipelineBlock = () => {
     return (
         <>
             <Section title="Pipeline" />
             <Card>
                 <div className={styles.PipelineBlock}>
-                    <ReactFlow elements={elements}>
+                    <ReactFlow
+                        elements={elements}
+                        onNodeDoubleClick={onNodeDoubleClick}
+                        onNodeDragStop={onNodeDragStop}
+                        onConnect={onConnect}
+                        onElementsRemove={onElementsRemove}
+                        deleteKeyCode={46}
+                        maxZoom={1}
+                        minZoom={1}
+                        snapToGrid={true}
+                        preventScrolling={false}
+                    >
                         <Background />
                     </ReactFlow>
                 </div>
                 <div style={{ textAlign: 'center' }}>
-                    <Button label="Add product" kind="inline" />
-                    <Button label="Add plant" kind="inline" />
+                    <Button
+                        label="Add product"
+                        kind="inline"
+                        onClick={props.onAddProduct}
+                    />
+                    <Button
+                        label="Add plant"
+                        kind="inline"
+                        onClick={props.onAddPlant}
+                    />
+                    <Button
+                        label="?"
+                        kind="inline"
+                        tooltip="Drag from one connector to another to create links between products and plants. Double click to rename an element. Press [Delete] to remove an element."
+                    />
                 </div>
             </Card>
         </>
-    )
-}
+    );
+};
 
 export default PipelineBlock;
\ No newline at end of file
diff --git a/relog-web/src/PipelineBlock.module.css b/relog-web/src/PipelineBlock.module.css
index c48d9c7..5aef023 100644
--- a/relog-web/src/PipelineBlock.module.css
+++ b/relog-web/src/PipelineBlock.module.css
@@ -1,5 +1,8 @@
 .PipelineBlock {
     height: 600px;
+    border: 1px solid rgba(0, 0, 0, 0.1);
+    border-radius: var(--border-radius);
+    margin-bottom: 12px;
 }
 
 .PlantNode, .ProductNode {
diff --git a/relog-web/src/PlantBlock.js b/relog-web/src/PlantBlock.js
index 8cb8268..6c402f5 100644
--- a/relog-web/src/PlantBlock.js
+++ b/relog-web/src/PlantBlock.js
@@ -1,20 +1,20 @@
-import Section from './Section'
-import Card from './Card'
-import Form from './Form'
-import TextInputRow from './TextInputRow'
-import FileInputRow from './FileInputRow'
-import DictInputRow from './DictInputRow'
+import Section from './Section';
+import Card from './Card';
+import Form from './Form';
+import TextInputRow from './TextInputRow';
+import FileInputRow from './FileInputRow';
+import DictInputRow from './DictInputRow';
 
 const PlantBlock = (props) => {
     const emissions = {
         "CO2": "0.05",
         "CH4": "0.01",
         "N2O": "0.04",
-    }
+    };
     const output = {
         "Nickel": "0.5",
         "Metal casing": "0.35",
-    }
+    };
     return (
         <>
             <Section title={props.name} />
@@ -136,7 +136,7 @@ const PlantBlock = (props) => {
                 </Form>
             </Card>
         </>
-    )
-}
+    );
+};
 
 export default PlantBlock;
\ No newline at end of file
diff --git a/relog-web/src/ProductBlock.js b/relog-web/src/ProductBlock.js
index eb6ba3c..fb7dcac 100644
--- a/relog-web/src/ProductBlock.js
+++ b/relog-web/src/ProductBlock.js
@@ -1,10 +1,18 @@
-import Section from './Section'
-import Card from './Card'
-import Form from './Form'
-import TextInputRow from './TextInputRow'
-import FileInputRow from './FileInputRow'
+import { useState } from 'react';
+import Section from './Section';
+import Card from './Card';
+import Form from './Form';
+import TextInputRow from './TextInputRow';
+import FileInputRow from './FileInputRow';
+import DictInputRow from './DictInputRow';
 
 const ProductBlock = (props) => {
+    const onChange = (field, val) => {
+        const newProduct = { ...props.value };
+        newProduct[field] = val;
+        props.onChange(newProduct);
+    };
+
     return (
         <>
             <Section title={props.name} />
@@ -19,7 +27,8 @@ const ProductBlock = (props) => {
                         label="Acquisition cost"
                         unit="$/tonne"
                         tooltip="The cost to acquire one tonne of this product from collection centers. Does not apply to plant outputs."
-                        default="0.00"
+                        value={props.value["acquisition cost ($/tonne)"]}
+                        onChange={v => onChange("acquisition cost ($/tonne)", v)}
                     />
 
                     <h1>Disposal</h1>
@@ -27,13 +36,15 @@ const ProductBlock = (props) => {
                         label="Disposal cost"
                         unit="$/tonne"
                         tooltip="The cost to dispose of one tonne of this product at a collection center, without further processing. Does not apply to plant outputs."
-                        default="0"
+                        value={props.value["disposal cost ($/tonne)"]}
+                        onChange={v => onChange("disposal cost ($/tonne)", v)}
                     />
                     <TextInputRow
                         label="Disposal limit"
                         unit="tonne"
                         tooltip="The maximum amount of this product that can be disposed of across all collection centers, without further processing."
-                        default="0"
+                        value={props.value["disposal limit (tonne)"]}
+                        onChange={v => onChange("disposal limit (tonne)", v)}
                     />
 
                     <h1>Transportation</h1>
@@ -41,24 +52,29 @@ const ProductBlock = (props) => {
                         label="Transportation cost"
                         unit="$/km/tonne"
                         tooltip="The cost to transport this product."
-                        default="0.00"
+                        value={props.value["transportation cost ($/km/tonne)"]}
+                        onChange={v => onChange("transportation cost ($/km/tonne)", v)}
                     />
                     <TextInputRow
                         label="Transportation energy"
                         unit="J/km/tonne"
-                        default="0"
                         tooltip="The energy required to transport this product."
+                        value={props.value["transportation energy (J/km/tonne)"]}
+                        onChange={v => onChange("transportation energy (J/km/tonne)", v)}
                     />
-                    <TextInputRow
+                    <DictInputRow
                         label="Transportation emissions"
                         unit="J/km/tonne"
                         tooltip="A dictionary mapping the name of each greenhouse gas, produced to transport one tonne of this product along one kilometer, to the amount of gas produced (in tonnes)."
-                        default="0"
+                        keyPlaceholder="Emission name"
+                        valuePlaceholder="0"
+                        value={props.value["transportation emissions (J/km/tonne)"]}
+                        onChange={v => onChange("transportation emissions (J/km/tonne)", v)}
                     />
                 </Form>
             </Card>
         </>
-    )
-}
+    );
+};
 
 export default ProductBlock;
\ No newline at end of file
diff --git a/relog-web/src/Section.js b/relog-web/src/Section.js
index cacd2cd..41fcad6 100644
--- a/relog-web/src/Section.js
+++ b/relog-web/src/Section.js
@@ -1,7 +1,7 @@
-import styles from './Section.module.css'
+import styles from './Section.module.css';
 
 const Section = (props) => {
-    return <h2 className={styles.Section}>{props.title}</h2>
-}
+    return <h2 className={styles.Section}>{props.title}</h2>;
+};
 
 export default Section;
\ No newline at end of file
diff --git a/relog-web/src/TextInputRow.js b/relog-web/src/TextInputRow.js
index 41b83e2..193e31a 100644
--- a/relog-web/src/TextInputRow.js
+++ b/relog-web/src/TextInputRow.js
@@ -1,15 +1,15 @@
-import form_styles from './Form.module.css'
-import Button from './Button'
+import form_styles from './Form.module.css';
+import Button from './Button';
 
 const TextInputRow = (props) => {
     let unit = "";
     if (props.unit) {
-        unit = <span className={form_styles.FormRow_unit}>({props.unit})</span>
+        unit = <span className={form_styles.FormRow_unit}>({props.unit})</span>;
     }
 
     let tooltip = "";
     if (props.tooltip != undefined) {
-        tooltip = <Button label="?" kind="inline" tooltip={props.tooltip} />
+        tooltip = <Button label="?" kind="inline" tooltip={props.tooltip} />;
     }
 
     return <div className={form_styles.FormRow}>
@@ -21,9 +21,10 @@ const TextInputRow = (props) => {
             placeholder={props.default}
             disabled={props.disabled}
             value={props.value}
+            onChange={e => props.onChange(e.target.value)}
         />
         {tooltip}
     </div>;
-}
+};
 
 export default TextInputRow;
\ No newline at end of file
diff --git a/relog-web/src/index.css b/relog-web/src/index.css
index 7cb9543..d6af5c0 100644
--- a/relog-web/src/index.css
+++ b/relog-web/src/index.css
@@ -39,6 +39,10 @@ body {
     border: 1px solid black !important;
 }
 
+.react-flow__handle:hover {
+    background-color: black !important;
+}
+
 .react-flow__handle-right {
     right: -5px !important;
 }
diff --git a/relog-web/src/index.js b/relog-web/src/index.js
index f699791..cbb20f4 100644
--- a/relog-web/src/index.js
+++ b/relog-web/src/index.js
@@ -3,7 +3,7 @@ import ReactDOM from 'react-dom';
 import './index.css';
 import Header from './Header';
 import InputPage from './InputPage';
-import Footer from './Footer'
+import Footer from './Footer';
 
 ReactDOM.render(
   <React.StrictMode>