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+++
title = "HX-Trigger Response Headers"
+++
These response headers can be used to trigger client side actions on the target element within a response to htmx. You
can trigger a single event or as many uniquely named events as you would like.
The headers are:
* `HX-Trigger` - trigger events as soon as the response is received.
* `HX-Trigger-After-Settle` - trigger events after the [settling step](@/docs.md#request-operations).
* `HX-Trigger-After-Swap` - trigger events after the [swap step](@/docs.md#request-operations).
To trigger a single event with no additional details you can simply send the event name in a header like so:
`HX-Trigger: myEvent`
This will trigger `myEvent` on the triggering element and will bubble up to the body. As an example you could
listen for this event like this:
```javascript
document.body.addEventListener("myEvent", function(evt){
alert("myEvent was triggered!");
})
```
... or like this, if you're trying to trigger some element without using JS code:
```html
<!-- Since it bubbles up to the <body>, we must use the `from:body` modifier below -->
<div hx-trigger="myEvent from:body" hx-get="/example"></div>
```
If you want to pass details along with the event, you can move to JSON for the value of the trigger:
`HX-Trigger: {"showMessage":"Here Is A Message"}`
To handle this event you would write the following code:
```javascript
document.body.addEventListener("showMessage", function(evt){
alert(evt.detail.value);
})
```
Note that the value of the message was put into the `detail.value` slot. If you wish to pass multiple pieces of data
you can use a nested JSON object on the right hand side of the JSON object:
`HX-Trigger: {"showMessage":{"level" : "info", "message" : "Here Is A Message"}}`
And handle this event like so:
```javascript
document.body.addEventListener("showMessage", function(evt){
if(evt.detail.level === "info"){
alert(evt.detail.message);
}
})
```
Each property of the JSON object on the right hand side will be copied onto the details object for the event.
### Multiple Triggers
If you wish to invoke multiple events, you can simply add additional properties to the top level JSON
object:
`HX-Trigger: {"event1":"A message", "event2":"Another message"}`
You may also trigger multiple events with no additional details by sending event names separated by commas, like so:
`HX-Trigger: event1, event2`
Using events gives you a lot of flexibility to add functionality to normal htmx responses.
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