tplinator

An HTML template renderer heavily inspired by the syntax used for Angular and VueJS applications.

Features

String Interpolation

Uses the {{go:[VARIABLE_NAME]}} syntax which can be placed on attribute values and inside HTML elements. It only accepts variables which are of type string.

Example

Golang code snippet

bytes, err := template.RenderBytes(map[string]interface{}{
    "username": "bryanmdlx",
    "currentDisplayName": "Bryan Dela Cruz",
})

HTML template snippet

<h1>Username: {{go:username}}</h1>
<form action="/user/{{go:username}}/details" method="POST">
    <input type="text" name="displayName" value="{{go:currentDisplayName}}"/>
    <button type="submit">Update</button>
</form>

Output HTML

<h1>Username: bryanmdlx</h1>
<form action="/user/bryanmdlx/details" method="POST">
    <input type="text" name="displayName" value="Bryan Dela Cruz"/>
    <button type="submit">Update</button>
</form>

Conditional Rendering

Uses the go-if, go-else-if (or go-elif), and go-else to define that the target element/s will be rendered conditionally. The value of the conditional attribute must be a boolean expression.

Example

Golang code snippet

bytes, err := template.RenderBytes(map[string]interface{}{
    "hasOne": false,
    "hasTwo": true,
    "hasThree": true,
})

HTML template snippet

<div class="messages">
    <p go-if="hasOne">Has one</p>
    <p go-else-if="hasTwo && !hasThree">Has two but does not have three</p>
    <p go-else-if="hasTwo && hasThree">Has two and three</p>
    <p go-else>Does not have any</p>
</div>

Output HTML

<div class="messages">
    <p>Has two and three</p>
</div>

Conditional Classes

Uses go-if-class-* to define that the target element's class will be added conditionally. The value of the conditional attribute must be a boolean expression.

Example

Golang code snippet

bytes, err := template.RenderBytes(map[string]interface{}{
    "isFood": true,
    "isDrink": false,
    "name": "Blueberry Cheesecake",
    "description": "A delicious treat from the realm of gods and goddesses.",
})

HTML template snippet

<div class="menu-entry" go-if-class-food="isFood" go-if-class-drink="isDrink">
    <h1>{{go:name}}</h1>
    <p>{{go:description}}</p>
</div>

Output HTML

<div class="menu-entry food">
    <h1>Blueberry Cheesecake</h1>
    <p>A delicious treat from the realm of gods and goddesses.</p>
</div>

List Rendering

Uses the go-range attribute to define that the target element must be rendered n times, where n is the length of the specified range variable, under its original parent element.

Each entry on the RangeParams function will be accessible only to the target element and its children. If it does not contain a variable needed for one of the string interpolations inside the target element, the variable will be looked for on the EvaluatorParams passed to the Template#Render* function.

Example

Golang code snippet

bytes, err := template.RenderBytes(tplinator.EvaluatorParams{
    "userId": "412897373847523",
    "menuEntries": tplinator.RangeParams(
        tplinator.EvaluatorParams{
            "id": "399585827",
            "isFood": true,
            "isDrink": false,
            "favoriteWhat": "food",
            "name": "Blueberry Cheesecake",
            "description": "A delicious treat from the realm of gods and goddesses.",
        },
        tplinator.EvaluatorParams{
            "id": "518273743",
            "isFood": false,
            "isDrink": true,
            "favoriteWhat": "drink",
            "name": "Iced Coffee",
            "description": "The tears of the trees that lives on the summit of the Alps.",
        },
    ),
})

HTML template snippet

<div class="menu">
    <div class="menu-entry" go-range="menuEntries" go-if-class-food="isFood" go-if-class-drink="isDrink">
        <h1>{{go:name}}</h1>
        <p class="description">{{go:description}}</p>
        <form action="/user/{{go:userId}}/favorite?what={{go:favoriteWhat}}&id={{go:id}}" method="POST">
            <button type="submit">Add {{go:name}} to my favorites</button>
        </form>
    </div>
</div>

Output HTML

<div class="menu">
    <div class="menu-entry food">
        <h1>Blueberry Cheesecake</h1>
        <p class="description">A delicious treat from the realm of gods and goddesses.</p>
        <form action="/user/412897373847523/favorite?what=food&id=399585827" method="POST">
            <button type="submit">Add Blueberry Cheesecake to my favorites</button>
        </form>
    </div>
    <div class="menu-entry drink">
        <h1>Iced Coffee</h1>
        <p class="description">The tears of the trees that lives on the summit of the Alps.</p>
        <form action="/user/412897373847523/favorite?what=drink&id=518273743" method="POST">
            <button type="submit">Add Iced Coffee to my favorites</button>
        </form>
    </div>
</div>

Contributions

This is Go package is currently highly experimental. Contributions from y'all would be much appreciated.