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Triggers

Triggers define when and how client-side events are sent to your WSX server. They provide sophisticated control over event timing, conditions, and behavior.

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Basic Triggers

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Default Triggers

Without specifying wx-trigger, elements use default triggers: 
<!-- Button defaults to 'click' -->
<button wx-send="my-action">Click Me</button>

<!-- Form defaults to 'submit' -->
<form wx-send="form-action">
  <input name="data" />
  <button type="submit">Submit</button>
</form>

<!-- Input defaults to 'input' -->
<input wx-send="search-action" />

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Explicit Triggers

Specify triggers using the wx-trigger attribute: 
<button wx-send="my-action" wx-trigger="click">Click Me</button>
<input wx-send="search" wx-trigger="input" />
<div wx-send="hover-action" wx-trigger="mouseenter">Hover Me</div>

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Trigger Events

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Common Events

  • click - Mouse clicks
  • submit - Form submissions
  • input - Input value changes
  • change - Input value changes (on blur)
  • keyup - Key release events
  • keydown - Key press events
  • mouseenter - Mouse enters element
  • mouseleave - Mouse leaves element
  • focus - Element gains focus
  • blur - Element loses focus

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Examples

<!-- Key events -->
<input wx-send="key-action" wx-trigger="keyup" />

<!-- Mouse events -->
<div wx-send="hover-start" wx-trigger="mouseenter">Hover Area</div>
<div wx-send="hover-end" wx-trigger="mouseleave">Hover Area</div>

<!-- Focus events -->
<input wx-send="focus-action" wx-trigger="focus" />
<input wx-send="blur-action" wx-trigger="blur" />

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Trigger Modifiers

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Throttling

Limit the frequency of requests: 
<!-- Max 1 request per 500ms -->
<input wx-send="search" wx-trigger="input throttle:500ms" />

<!-- Max 1 request per 2 seconds -->
<button wx-send="save" wx-trigger="click throttle:2s">Save</button>

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Debouncing (Queue)

Delay requests until activity stops: 
<!-- Wait 300ms after last input -->
<input wx-send="search" wx-trigger="input queue" />

<!-- Custom delay -->
<input wx-send="search" wx-trigger="input queue:1s" />

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Delays

Add delays before sending requests: 
<!-- 1 second delay after click -->
<button wx-send="delayed-action" wx-trigger="click delay:1s">
  Delayed Action
</button>

<!-- 500ms delay after input -->
<input wx-send="delayed-search" wx-trigger="input delay:500ms" />

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Conditional Triggers

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Key Conditions

Trigger only on specific keys: 
<!-- Only on Enter key -->
<input wx-send="search" wx-trigger="keyup[Enter]" />

<!-- Only on Escape key -->
<input wx-send="cancel" wx-trigger="keyup[Escape]" />

<!-- Only with Ctrl key -->
<input wx-send="save" wx-trigger="keyup[ctrlKey]" />

<!-- Only with Shift key -->
<input wx-send="special" wx-trigger="keyup[shiftKey]" />

<!-- Combination: Ctrl+Enter -->
<textarea wx-send="submit" wx-trigger="keyup[ctrlKey+Enter]"></textarea>

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Change Detection

Only trigger when values actually change: 
<!-- Only when value changes -->
<input wx-send="changed-search" wx-trigger="blur changed" />

<!-- Combine with other modifiers -->
<input wx-send="changed-search" wx-trigger="input changed throttle:300ms" />

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Once Modifier

Trigger only once: 
<!-- Button can only be clicked once -->
<button wx-send="once-action" wx-trigger="click once">
  Click Once Only
</button>

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Multiple Triggers

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Combining Triggers

Use multiple events for the same action: 
<!-- Trigger on both click and Enter -->
<button wx-send="submit" wx-trigger="click, keyup[Enter]">
  Submit
</button>

<!-- Different events, same action -->
<input wx-send="auto-save" wx-trigger="blur, input throttle:2s" />

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Different Actions

Different triggers for different actions: 
<input 
  wx-send="immediate-search" 
  wx-trigger="input throttle:300ms"
  wx-send-enter="full-search"
  wx-trigger-enter="keyup[Enter]"
/>

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Advanced Trigger Patterns

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Conditional Logic

<!-- Only when input has value -->
<input wx-send="search" wx-trigger="input[value]" />

<!-- Only when checkbox is checked -->
<input type="checkbox" wx-send="toggle" wx-trigger="change[checked]" />

<!-- Only when specific value -->
<select wx-send="category-change" wx-trigger="change[value='premium']">
  <option value="basic">Basic</option>
  <option value="premium">Premium</option>
</select>

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Form Validation

<!-- Only when form is valid -->
<form wx-send="validate-form" wx-trigger="input[checkValidity()]">
  <input required />
  <button type="submit">Submit</button>
</form>

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Progressive Enhancement

<!-- Fallback for non-JavaScript users -->
<form action="/fallback" method="post" wx-send="ajax-submit">
  <input name="data" />
  <button type="submit">Submit</button>
</form>

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Trigger Timing

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Immediate Triggers

<!-- No delay -->
<button wx-send="immediate" wx-trigger="click">Immediate</button>

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Delayed Triggers

<!-- 1 second delay -->
<button wx-send="delayed" wx-trigger="click delay:1s">Delayed</button>

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Throttled Triggers

<!-- Max once per 500ms -->
<input wx-send="throttled" wx-trigger="input throttle:500ms" />

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Debounced Triggers

<!-- Wait 300ms after last event -->
<input wx-send="debounced" wx-trigger="input queue:300ms" />

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Real-World Examples

<input 
  type="text" 
  placeholder="Search..." 
  wx-send="search"
  wx-target="#results"
  wx-trigger="input throttle:300ms changed"
/>

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Auto-Save Form

<form wx-send="auto-save" wx-trigger="input throttle:2s">
  <input name="title" />
  <textarea name="content"></textarea>
</form>

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Keyboard Shortcuts

<div wx-send="save" wx-trigger="keyup[ctrlKey+s]">
  Press Ctrl+S to save
</div>

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Progressive Loading

<div 
  wx-send="load-more" 
  wx-target="#content"
  wx-trigger="scroll[bottom]"
>
  Scroll to load more...
</div>

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Custom Triggers

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JavaScript Events

// Trigger custom events
document.querySelector('#my-element').dispatchEvent(
  new CustomEvent('my-custom-event', { detail: { data: 'value' } })
);

<!-- Listen for custom events -->
<div wx-send="custom-action" wx-trigger="my-custom-event">
  Custom Event Target
</div>

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Programmatic Triggers

// Trigger WSX actions programmatically
wsx.trigger('#my-element', { customData: 'value' });

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Best Practices

  1. Choose Appropriate Events: Use the right trigger for the user interaction
  2. Throttle Heavy Operations: Use throttling for expensive operations like search
  3. Debounce User Input: Use queue for final input validation
  4. Provide Feedback: Show loading states for delayed actions
  5. Consider Accessibility: Ensure triggers work with keyboard navigation
  6. Progressive Enhancement: Provide fallbacks for critical functionality

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Next Steps