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manual
Curso Bsico de HTML
Introduccin a la programacin de pginas Web
Publicado por JL Fecha: 2006-12-02 01:20:00 Idioma: Espaol Tipo de documento: manual
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Curso de HTML Bsico

Curso bsico de HTML

Gua para principiantes

(Curso para introducir a alguien a la programacin de pginas web)



Programas escritos en JavaScript.

Adems de leerse las especificaciones de JavaScript para realizar programas en Java, existe una forma ms facil de incluir estos scripts en nuestra pgina. Si estamos viendo una pgina que tiene algun efecto especial que nos guste, simplemente hemos de visualizar el cdigo fuente de la misma (en Netscape opcion View - Document Source), marcar con el ratn todo el bloque contenido entre las directivas <SCRIPT> </SCRIPT>, copiarlas al portapapeles con CTRL+C y posteriormente incluir este bloque en nuestra pgina modificando los literales o frases animadas. Estas frases sern faciles de localizar porque contendrn la palabra var xx= " ....." antecedindolas.

Sirva como ejemplo este cdigo completo de una funcin JavaScript muy utilizada, que muestra varios mensajes desplazndose por la barra inferior del visor de pginas Web. Debemos modificar los literales indicados en var m1, var m2 y var m3 para adecuarlos al texto que queramos mostrar. Si se desea incluir mas mensajes hay que aadir mas lneas del tipo var mx = "texto " y "sumar" dichas variables en el apartado var msg = .

IMPORTANTE: Ntese que el cdigo JAVASCRIPT se encuentra en la seccin de "cabecera" (<HEAD>), y que la directiva <BODY> incluye el parmetro onload para que se comience a ejecutar el cdigo JavaScript en el momento de cargar la pagina.



<HTML>
<HEAD>
<SCRIPT language="JavaScript">
<!-- Ocultar el cdigo para los viejos visores html --
 function scrollit(seed)
 {
 var m1 = " Texto 1 "
 var m2 = " Texto 2 "
 var m3 = " Texto 3 "
 var msg=m1+m2+m3;
 var out = " ";
 var c = 0;
 if (seed > 100)
 {
 seed--;
 var cmd="scrollit(" + seed + ")";
 timerTwo=window.setTimeout(cmd,7);
 }
 else
 if (seed <= 100 && seed > 0)
 {
 for (c=0 ; c < seed ; c++)
 {
 out+=" ";
 }
 out+=msg;
 seed--;
 var cmd="scrollit(" + seed + ")";
 window.status=out;
 timerTwo=window.setTimeout(cmd,7);
 }
 else if (seed <= 0)
 {
 if (-seed < msg.length)
 {
 out+=msg.substring(-seed,msg.length);
 seed--;
 var cmd="scrollit(" + seed + ")";
 window.status=out;
 timerTwo=window.setTimeout(cmd,7);
 }
 else
 {
 window.status=" ";
 timerTwo=window.setTimeout("scrollit(100)",75);
 }
 }
 }
 // --Final del codigo oculto -->
</SCRIPT>
<TITLE></TITLE>
</HEAD>
<BODY onload="timerONE=window.setTimeout('scrollit(100)',500)">

 

Aqu va el contenido de tu pgina

 

</BODY>

</HTML>

 

NASA

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