Categoria: javascript


Ottima raccolta di tutorials su good-tutorials.com divisi per categorie.

Sito web: http://www.good-tutorials.com/

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Sito web: http://www.noupe.com/..-tutorials.html

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Ottimo sito dove poter trovare interessanti tutorial avanazati su programmazione web.

Sito web: http://nettuts.com/

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In questo articolo vedremo come modificare lo stile css di una pagina web con uno script javascript. Nella pagina html, avremo l'elenco degli stili:

...

<link rel="stylesheet" type="text/css" href="stile1.css" title="stile1" />
<link rel="alternate stylesheet" type="text/css" href="stile2.css" title="stile2" />

... 

e oltre al resto della pagina, la chiamata al file javascript:

 <script type="text/javascript" src="switcher.js"></script>

cosi impostato:

/* Style Switcher by Paul Sowden, see A List Apart: http://www.alistapart.com/articles/alternate/ */

function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
}

function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
  }
  return null;
}

function getPreferredStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1
       && a.getAttribute("rel").indexOf("alt") == -1
       && a.getAttribute("title")
       ) return a.getAttribute("title");
  }
  return null;
}

function createCookie(name,value,days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime()+(days*24*60*60*1000));
    var expires = "; expires="+date.toGMTString();
  }
  else expires = "";
  document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
  var nameEQ = name + "=";
  var ca = document.cookie.split(';');
  for(var i=0;i < ca.length;i++) {
    var c = ca[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
  }
  return null;
}

window.onload = function(e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}

window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);

document.writeln("<div id=\"textsize\">Passa a stile1: <a href=\"#\" onclick=\"setActiveStyleSheet('stile1'); return false;\" id=\"stile1\">Stile1</a><a href=\"#\" onclick=\"setActiveStyleSheet('stile2'); return false;\" id=\"stile2\">Passa a stile2</a></div>"); 

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 Se volete comprimere file javascript, bananascript.com fà al caso vostro. Permette di ridurre di tanto la dimensione di un file javascript.

Sito web: http://www.bananascript.com/

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In questo articolo vedremo come mostrare un elemento div alle coordinate del mouse. Supponiamo di avere un div con id divColor in posizione 155,355, e vogliamo che prenda la posizione del mouse

function ShowDivAtPoint(id){
     var x=event.x; //Cordinata X del Mouse
     var y=event.y; //Cordinata Y del Mouse
     var doc=document.getElementById(id);
     doc.style.left=x;
     doc.style.top=y;
}

che richiameremo con

ShowDivAtPoint('divColor') 

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In questo tutorial vedremo come evidenziare delle parole di un testo direttamente da javascript, passandogli attraverso la querystring al parola da evidenziare.

File contenente il testo 

Come prima cosa creiamo o modifichiamo il nostro file che per comodità ho preso essere html. Definiamo una classe css che setta lo stile dell'evidenziamento:

<style>
.searchword{
background-color:yellow;
}
</style>

e poi richiamiamo lo script javascript che si occuperà di fare tutto il lavoro:

<script src="searchhi.js"></script> 

File javascript 

/* http://www.kryogenix.org/code/browser/searchhi/ */
/* Modified 20021006 to fix query string parsing and add case insensitivity */
/* Modified 20070316 to stop highlighting inside nosearchhi nodes */
/* Modificato 19 gennaio 2008 da sandro stracuzzi - sandrostracuzzi@hotmail.com */
function highlightWord(node,word) {
        // Iterate into this nodes childNodes
        if (node.hasChildNodes) {
                var hi_cn;
                for (hi_cn=0;hi_cn<node.childNodes.length;hi_cn++) {
                        highlightWord(node.childNodes[hi_cn],word);
                }
        }
        // And do this node itself
        if (node.nodeType == 3) { // text node
                tempNodeVal = node.nodeValue.toLowerCase();
                tempWordVal = word.toLowerCase();
                if (tempNodeVal.indexOf(tempWordVal) != -1) {
                        pn = node.parentNode;
                        // check if we're inside a "nosearchhi" zone
                        checkn = pn;

                        while (checkn.nodeType != 9 &&
                        checkn.nodeName.toLowerCase() != 'body') {
                        // 9 = top of doc
                                if (checkn.className.match(/\bnosearchhi\b/)) { return; }
                                checkn = checkn.parentNode;
                        }
                        if (pn.className != "searchword") {
                                // word has not already been highlighted!
                                nv = node.nodeValue;
                                ni = tempNodeVal.indexOf(tempWordVal);
                                // Create a load of replacement nodes
                                before = document.createTextNode(nv.substr(0,ni));
                                docWordVal = nv.substr(ni,word.length);
                                after = document.createTextNode(nv.substr(ni+word.length));
                                hiwordtext = document.createTextNode(docWordVal);
                                hiword = document.createElement("span");
                                hiword.className = "searchword";
                                hiword.appendChild(hiwordtext);
                                pn.insertBefore(before,node);
                                pn.insertBefore(hiword,node);
                                pn.insertBefore(after,node);
                                pn.removeChild(node);
                       }
                }
        }
}

function googleSearchHighlight() {
var q = location.search;
var q = q.replace("?q=","")
highlightWord(document.getElementsByTagName("body")[0],q);
}

window.onload = googleSearchHighlight;

Funzionamento 

Basta richiamare il nome del file passandogli alla variabile q nella querystring il valore da cercare e il gioco è fatto. Ad esempio:

ricerca.html?q=prova

Dove ricerca,html è il file html di cui parlavamo all'inizio 

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Sito web: http://24ways.org/2007/javascript-internationalisation

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Proprietà - CSS Referenza - JavaScript
background background
background-attachment backgroundAttachment
background-color backgroundColor
background-image backgroundImage
background-position backgroundPosition
background-repeat backgroundRepeat
border border
border-bottom borderBottom
border-bottom-color borderBottomColor
border-bottom-style borderBottomStyle
border-bottom-width borderBottomWidth
border-color borderColor
border-left borderLeft
border-left-color borderLeftColor
border-left-style borderLeftStyle
border-left-width borderLeftWidth
border-right borderRight
border-right-color borderRightColor
border-right-style borderRightStyle
border-right-width borderRightWidth
border-style borderStyle
border-top borderTop
border-top-color borderTopColor
border-top-style borderTopStyle
border-top-width borderTopWidth
border-width borderWidth
clear clear
clip clip
color color
cursor cursor
display display
filter filter
font font
font-family fontFamily
font-size fontSize
font-variant fontVariant
font-weight fontWeight
height height
left left
letter-spacing letterSpacing
line-height lineHeight
list-style listStyle
list-style-image listStyleImage
list-style-position listStylePosition
list-style-type listStyleType
margin margin
margin-bottom marginBottom
margin-left marginLeft
margin-right marginRight
margin-top marginTop
overflow overflow
padding padding
padding-bottom paddingBottom
padding-left paddingLeft
padding-right paddingRight
padding-top paddingTop
page-break-after pageBreakAfter
page-break-before pageBreakBefore
position position
float styleFloat
text-align textAlign
text-decoration textDecoration
text-decoration: blink textDecorationBlink
text-decoration: line-through textDecorationLineThrough
text-decoration: none textDecorationNone
text-decoration: overline textDecorationOverline
text-decoration: underline textDecorationUnderline
text-indent textIndent
text-transform textTransform
top top
vertical-align verticalAlign
visibility visibility
width width
z-index zIndex

Fonte: