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El evento DOMContentLoaded es disparado cuando el documento HTML ha sido completamente cargado y parseado, sin esperar hojas de estilo, images y subframes para finalizar la carga. Un evento muy diferente - load - deberia ser usado solo para detectar una carga completa de la pagina. Es un error increiblemente popular usar load cuando DOMContentLoaded seria mucho mas apropiado, ser cuidadoso.
Speeding up
If you want DOM to get parsed as fast as possible after the user had requested the page, some things you could do is turn your JavaScript asynchronous and to optimize loading of stylesheets which if used as usual, slow down page load due to being loaded in parallel, "stealing" traffic from the main html document.
General info
- Specification
- HTML5
- Interface
- Event
- Bubbles
- Yes
- Cancelable
- Yes (although specified as a simple event that isn't cancelable)
- Target
- Document
- Default Action
- None.
Properties
| Property | Type | Description |
|---|---|---|
target Read only |
EventTarget |
The event target (the topmost target in the DOM tree). |
type Read only |
DOMString |
The type of event. |
bubbles Read only |
Boolean |
Whether the event normally bubbles or not |
cancelable Read only |
Boolean |
Whether the event is cancellable or not? |
Example
<script>
document.addEventListener("DOMContentLoaded", function(event) {
console.log("DOM fully loaded and parsed");
});
</script>
<script>
document.addEventListener("DOMContentLoaded", function(event) {
console.log("DOM fully loaded and parsed");
});
for(var i=0; i<1000000000; i++)
{} // this synchronous script is going to delay parsing of the DOM. So the DOMContentLoaded event is going to launch later.
</script>
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 1.0[1] | 1.0 (1.7 or earlier)[1] | 9.0[2] | 9.0 | 3.1[1] |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | (Yes)[1] | 1.0 (1)[1] | ?[2] | (Yes) | (Yes)[1] |
[1] Bubbling for this event is supported by at least Gecko 1.9.2, Chrome 6, and Safari 4.
[2] Internet Explorer 8 supports the readystatechange event, which can be used to detect when the DOM is ready. In earlier versions of Internet Explorer, this state can be detected by repeatedly trying to execute document.documentElement.doScroll("left");, as this snippet will throw an error until the DOM is ready.