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Functions
Examples
CSS helpers provide utilities for working with CSS classes and styles in templates.
Functions
classes
Joins CSS classes, optionally adding a space after the final class name.
Template Syntax
<div class="{classes classNamesArray true}">Content</div>Parameters
| Name | Type | Default | Description |
|---|---|---|---|
| classNames | array | Array of class names | |
| spaceAfter | boolean | true | Whether to add a space after the final class name |
Returns
string - Joined class names.
Example
<button class="{classes ['primary', size, color] true}"> {buttonText}</button>classIf
Conditionally applies a CSS class.
Template Syntax
<button class="{classIf isActive 'active' 'inactive'}">Click me</button>Parameters
| Name | Type | Default | Description |
|---|---|---|---|
| expr | boolean | Condition to evaluate | |
| trueClass | string | ‘’ | Class to apply if condition is true |
| falseClass | string | ‘’ | Class to apply if condition is false |
Returns
string - The resulting class name with a trailing space.
Example
<li class="item {classIf isSelected 'selected' ''}"> {itemName}</li>classMap
Applies multiple CSS classes based on conditions.
Template Syntax
<div class="{classMap { active: isActive disabled: isDisabled} }">Content</div>Parameters
| Name | Type | Description |
|---|---|---|
| classObj | object | Object with class names as keys and conditions as values |
Returns
string - Resulting class names with a trailing space.
Example
<form class="{classMap (object 'form': true, 'loading': isLoading, 'error': hasErrors, 'success': isSubmitted)}"> <!-- Form content --></form>activeIf
Adds ‘active’ class if expression is truthy.
Template Syntax
<li class="{activeIf isCurrentPage}">Menu Item</li>Parameters
| Name | Type | Description |
|---|---|---|
| expr | boolean | Condition to evaluate |
Returns
string - ’active ’ if condition is true, otherwise an empty string.
Example
<nav> {#each menuItems} <a href="{this.path}" class="{activeIf this.path === currentPath}">{this.name}</a> {/each}</nav>selectedIf
Adds ‘selected’ class if expression is truthy.
Template Syntax
<option {selectedIf isOptionSelected}>Option</option>Parameters
| Name | Type | Description |
|---|---|---|
| expr | boolean | Condition to evaluate |
Returns
string - ’selected ’ if condition is true, otherwise an empty string.
Example
<select> {#each options} <option value="{value}" {selectedIf value === selectedValue}>{label}</option> {/each}</select>disabledIf
Adds ‘disabled’ class if expression is truthy.
Template Syntax
<button class="{disabledIf isButtonDisabled}">Submit</button>Parameters
| Name | Type | Description |
|---|---|---|
| expr | boolean | Condition to evaluate |
Returns
string - ’disabled ’ if condition is true, otherwise an empty string.
Example
<div class="{disabledIf !isEditable}"> <input type="text" value="{inputValue}"></div>checkedIf
Adds ‘checked’ class if expression is truthy.
Template Syntax
<div class="checkbox {checkedIf isOptionChecked}"> <input type="checkbox" name="example"> <label>Check me</label></div>Parameters
| Name | Type | Description |
|---|---|---|
| expr | boolean | Condition to evaluate |
Returns
string - ’checked ’ if condition is true, otherwise an empty string.
Example
{#each preferences} <div class="checkbox {checkedIf this.enabled}"> <input type="checkbox" name="{this.name}"> <label>{this.label}</label> </div>{/each}