# rw\.setProps

The `rw.setProps()` function passes data from your hook to your templates. Any data passed becomes available as template variables.

## Syntax

```javascript
rw.setProps({
    key: value,
    anotherKey: anotherValue
});
```

## Basic Examples

### Simple Values

```javascript
const transformHook = (rw) => {
    rw.setProps({
        message: 'Hello, World!',
        count: 42,
        isVisible: true
    });
};

exports.transformHook = transformHook;
```

In templates:

```html
<p>{{message}}</p>
<span>Count: {{count}}</span>
@if(isVisible)
    <div>Visible content</div>
@endif
```

### Arrays

```javascript
const transformHook = (rw) => {
    rw.setProps({
        team: ["Ben", "Dan", "Tom"],
        numbers: [1, 2, 3, 4, 5]
    });
};

exports.transformHook = transformHook;
```

In templates:

```html
<ul>
    @each(member in team)
        <li>{{member}}</li>
    @endeach
</ul>
```

### Objects

```javascript
const transformHook = (rw) => {
    rw.setProps({
        apps: {
            elements: {
                slogan: "Build beautiful websites. No code required.",
                isAmazing: true
            },
            squash: {
                slogan: "Batch Photo Editor",
                isAmazing: true
            }
        }
    });
};

exports.transformHook = transformHook;
```

In templates:

```html
<p>{{apps.elements.slogan}}</p>
@if(apps.elements.isAmazing)
    <span>Amazing!</span>
@endif
```

## Common Patterns

### Passing Transformed Props

```javascript
const transformHook = (rw) => {
    const { firstName, lastName, price, quantity } = rw.props;
    
    rw.setProps({
        fullName: `${firstName} ${lastName}`,
        total: price * quantity,
        formattedTotal: `$${(price * quantity).toFixed(2)}`
    });
};

exports.transformHook = transformHook;
```

### Conditional Values

```javascript
const transformHook = (rw) => {
    const { size, customSize } = rw.props;
    
    rw.setProps({
        displaySize: customSize || size,
        hasCustomSize: !!customSize
    });
};

exports.transformHook = transformHook;
```

### Spreading Collections

```javascript
const transformHook = (rw) => {
    // Pass all collections to templates
    rw.setProps({
        ...rw.collections
    });
};

exports.transformHook = transformHook;
```

### Building CSS Classes

```javascript
const transformHook = (rw) => {
    const { padding, margin, rounded, shadow } = rw.props;
    
    const classes = [
        padding,
        margin,
        rounded && 'rounded-lg',
        shadow && 'shadow-md'
    ].filter(Boolean).join(' ');
    
    rw.setProps({
        classes
    });
};

exports.transformHook = transformHook;
```

## Multiple Calls

You can call `setProps` multiple times. Properties are merged:

```javascript
const transformHook = (rw) => {
    rw.setProps({
        title: 'Hello'
    });
    
    // This adds to existing props, doesn't replace them
    rw.setProps({
        subtitle: 'World'
    });
    
    // Both title and subtitle are now available in templates
};

exports.transformHook = transformHook;
```

## Passing Context Objects

```javascript
const transformHook = (rw) => {
    rw.setProps({
        project: rw.project,
        page: rw.page,
        component: rw.component
    });
};

exports.transformHook = transformHook;
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.realmacsoftware.com/elements-docs/elements-language/component/hooks.js/available-functions/rw.setprops.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.