Motore di Ricerca interno alla pagina

Con questo DHTML possiamo inserire un motore di ricercainterno alla pagina, che simula la funzioneModifica>Trova presente nel browser. Inpratica i risultati verranno evidenziati, uno alla volta, adogni pressione del tasto "trova" presente nel form.

Lo script, creato da Alan Koontz, ècompatibile con Internet Explorer 4 esuperiori, Netscape7, eMozilla, mentre non ècompatibile con Netscape 6.

Per utilizzare lo script, è sufficiente copiare questocodice all'interno del tag body nellapagina web in cui dobbiamo eseguire la ricerca:

1.<script><!-- Hide from old browsers

/******************************************* Find In Page Script -- Submitted/revised by Alan Koontz (alankoontz@REMOVETHISyahoo.com)* Visit Dynamic Drive (http://www.dynamicdrive.com/) for full source code* Modified Jan 4th, 03'. This notice must stay intact for use******************************************/

// revised by Alan Koontz -- 9/18/02var TRange = null;var win = null;var frameval = false

;//  SELECTED BROWSER SNIFFER COMPONENTS DOCUMENTED AT//  http://www.mozilla.org/docs/web-developer/sniffer/browser_type.htmlvar nom = navigator.appName.toLowerCase();var agt = navigator.userAgent.toLowerCase();var is_major  = parseInt(navigator.appVersion);var is_minor  = parseFloat(navigator.appVersion);var is_ie     = (agt.indexOf(

"msie") != -1);var is_ie4up = (is_ie && (is_major >= 4));var is_nav = (nom.indexOf('netscape

')!=-1);var is_nav4   = (is_nav && (is_major == 4));var is_mac    = (agt.indexOf("mac")!=-1);var is_gecko  = (agt.indexOf('

gecko

') != -1);//  GECKO REVISIONvar is_rev=0if (is_gecko) {temp = agt.split("rv:")is_rev = parseFloat(temp[1])}//  USE THE FOLLOWING VARIABLE TO CONFIGURE FRAMES TO SEARCH//  (SELF OR CHILD FRAME)//  If you want to search another frame, change "self" below to//  parent.frames["thisframe"]//  where "thisframe" is the name of the target frame//  eg: var frametosearch1 = parent.frames["thisframe"]var frametosearch1 = selffunction search(whichform, whichframe) {//  TEST FOR IE5 FOR MAC (NO DOCUMENTATION)if (is_ie4up && is_mac) return;//  TEST FOR NAV 6 (NO DOCUMENTATION)if (is_gecko && (is_rev <1)) return;//  INITIALIZATIONS FOR FIND-IN-PAGE SEARCHESif(whichform.findthis.value!=null && whichform.findthis.value!='

') { str = whichform.findthis.value; if(whichframe!=self) frameval=true;  // this will enable Nav7 to search child frame win = whichframe;    }else return;  //  i.e., no search string was enteredvar strFound;//  NAVIGATOR 4 SPECIFIC CODEif(is_nav4 && (is_minor < 5)) {     strFound=win.find(str); // case insensitive, forward search by default//  There are 3 arguments available:// ; searchString: type string and it'

s the item to be searched// caseSensitive: boolean -- is search case sensitive?// backwards: boolean --should we also search backwards?// strFound=win.find(str, false, false

) is the explicit//  version of the above//  The Mac version of Nav4 has wrapAround, but//  cannot be specified in JS     }//  NAVIGATOR

7 SPECIFIC CODE (WILL NOT WORK WITH NAVIGATOR 6)if (is_gecko && (is_rev >= 1)) { if(frameval!=false) win.focus(); // force search in specified child frame strFound=win.find(str, false, false, true, false, frameval, false);// There are 7 arguments available:// ; searchString: type string and it

's the item to be searched//  caseSensitive: boolean -- is search case sensitive?//  backwards: boolean --should we also search backwards?//  wrapAround: boolean -- should we wrap the search?//  wholeWord: boolean: should we search only for whole words//  searchInFrames: boolean -- should we search in frames?//  showDialog: boolean -- should we show the Find Dialog?} if (is_ie4up) {  // EXPLORER-SPECIFIC CODE  if (TRange!=null) {    TRange.collapse(false)    strFound=TRange.findText(str)    if (strFound) TRange.select();   }  if (TRange==null || strFound==0) {    TRange=win.document.body.createTextRange()    strFound=TRange.findText(str)    if (strFound) TRange.select();  } }  if (!strFound) alert ("String '

" +str+ "' not found!") // string not found }// --></script><!-- EXAMPLE FORM OF FIND-IN-PAGE SEARCH USING SUBMIT (ALLOWING 'ENTER/RETURN

' KEY PRESS EVENT) --><form name="form1" action="" onSubmit="search(document.form1, frametosearch1); return false"><input type="text" name="findthis" size="15" title="Press '

ALT s

' after clicking submit to repeatedly search page"> <input type="submit" value="Find in Page" ACCESSKEY="s"></form></textarea></p><p>Per problemi nell'

utilizzo dello script, potete consultare il nostro <a href="http://forum.webmasterpoint.net" target="_blank"

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Per problemi nell'utilizzo dello script, poteteconsultare il nostro forum didiscussione.