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<html>
<head>
<script type="text/javascript">
function mouseOver() {
document.b1.src ="first.gif"
}
function mouseOut() {
document.b1.src ="second.gif"
}
</script>
</head>
<body>
<a href="http://www.w3schools.com" target="_blank">
<img border="0" alt="Visit W3Schools!" src="b_pink.gif" name="b1"
onmouseOver="mouseOver()" onmouseOut="mouseOut()" />
</a>
</body>
</html>
<script type="text/javascript">
function validate_email(field, alert_txt) {
with (field) {
apos=value.indexOf("@")
dotpos=value.lastIndexOf(".")
if (apos<1||dotpos-apos<2) {
alert(alert_txt);
return false
} else {
return true;
}
}
}
function validate_form(thisform) {
with (thisform) {
if (validate_email(email,"Not valid e-mail address!")==false) {
email.focus();
return(false);
}
}
}
</script>
<body>
<form action="submitpage.htm"
onsubmit="return validate_form(this);"
method="post"> Email:
<input type="text" name="email" size="30">
<input type="submit" value="Submit">
</form>
</body>
javascript version html test
[edit]- ff2.0 is javascript1.7
- ie6.0 is javascript1.3
<HEAD>
<SCRIPT LANGUAGE="JavaScript">
<!-- This script is from http://javascript.internet.com/user-details/javascript-version.html -->
<!-- Begin
jsver = "1.0";
// End --></SCRIPT>
<SCRIPT LANGUAGE="JavaScript1.1"><!-- Begin
jsver = "1.1";
// End --></SCRIPT>
<SCRIPT Language="JavaScript1.2"><!-- Begin
jsver = "1.2";
// End --></SCRIPT>
<SCRIPT Language="JavaScript1.3"><!-- Begin
jsver = "1.3";
// End --></SCRIPT>
<SCRIPT Language="JavaScript1.4"><!-- Begin
jsver = "1.4";
// End --></SCRIPT>
<SCRIPT Language="JavaScript1.5"><!-- Begin
jsver = "1.5";
// End --></SCRIPT>
<SCRIPT Language="JavaScript1.6"><!-- Begin
jsver = "1.6";
// End --></SCRIPT>
<SCRIPT Language="JavaScript1.7"><!-- Begin
jsver = "1.7";
// End --></SCRIPT>
<SCRIPT Language="JavaScript1.8"><!-- Begin
jsver = "1.8";
// End --></SCRIPT>
<NOSCRIPT>
<B>Your browser does not currently support JavaScript.</B>
<P><HR><P>
With Internet Explorer 5: Go to Tools Menu|Internet Options, Security Tab and click on the Custom Level. Then select disable active scripting under the scripting section.
</NOSCRIPT>
<!-- STEP TWO: Add the last coding to the BODY of your HTML document -->
<BODY>
<SCRIPT LANGUAGE="JavaScript"><!-- Begin
document.write("<B>Your browser supports JavaScript version " + jsver + ".</B>")
// End --></SCRIPT>
Netflix online rent simulation
[edit]
// definitions here
var maxdisc=2;
var hmin=new Array; // hmin is the min day of a state
var hmax=new Array; // hmax is the max dat of a state
var hh=new Array; // hh is the state of a particular disk
var hhd=new Array; // hhd contains the n days for a particular disk
var hhr=new Array; // contains the random number
// state 0 - in netflix
// state 1 - in mail
// state 2 - in house
// state 3 - in mail
hmin[0] = 1; hmax[0]=2;
hmin[1] = 1; hmax[1]=2;
hmin[2] = 2; hmax[2]=5;
hmin[3] = 1; hmax[3]=2;
var i,dy=0;
var tot=0;
for(i=0;i<maxdisc;i++) { // one disc at a time
hh[i]=0;
hhd[i]=0;
hhr[i]=getrand(hh[i]);
}
// process one day at a time
for(dy=0;dy<100;dy++) {
for(i=0;i<maxdisc;i++) { // one disc at a time
// print("Day "+dy+": Disc "+i+" is in state "+hh[i]+", max="+hhr[i]);
// increment the day
hhd[i]++;
if(hhd[i]==hhr[i]) {
hh[i]++; // advance the state
if(hh[i]==4) hh[i]=0;
if(hh[i]==2) tot++;
hhr[i]=getrand(hh[i]);
hhd[i]=0;
}
}
print("Day "+dy+": Discs "+cntit()+" Total Rented: "+tot);
}
function getrand(state) {
var j;
if(state==2) {
switch(cntit()) {
case 0:
case 1: hmin[2]=2; hmax[2]=5; break;
case 2: hmin[2]=3; hmax[2]=6; break;
case 3: hmin[2]=4; hmax[2]=7; break;
default: hmin[2]=5; hmax[2]=8; break;
}
hmin[2]=1; hmax[2]=2;
}
j=Math.floor(Math.random()*1000) % (hmax[state]-hmin[state]+1);
j=j+hmin[state];
return(j);
}
function cntit() {
var cnt,i;
cnt=0;
for(i=0;i<maxdisc;i++) {
if(hh[i]==2) cnt++;
}
return(cnt);
}
array being released in memory
[edit]- Summary: YES! firefox/ie releases the memory allocated (local variable) inside the function().
- refer to "var thh" below:
- If the "glb=hh.keys();" is changed to "glb.push(hh.keys());", then memory will continuously go up!!! This means that variables are released smartly.
<html><head><script type="text/javascript">
var c=0, t;
function myrand(limit) { // limit is optional. Default is 1000000
// Need 30% more to cover all combinations. For example, if limit=100, you need 130 iterations to get all 100 combinations.
var initialseed=7;
var thelimit = limit ? limit : 1000000;
var sum=initialseed;
var cntr=0;
this.myrand = function() {
sum = sum*71 + 3; // 49 is letter "a", 73 is 122-49. however, 71 has more unique combination
sum = sum % thelimit; // 250000 combinations
if(sum==initialseed) cntr++;
return((sum+cntr) % thelimit);
}
this.getcntr = function() { return(cntr) };
}
function hash(ini) {
var ownfunc=new Array;
var ii;
this.keys = function() {
var thh=new Array;
ccc=0;
for(ii in this) {
ccc++;
if(ii in ownfunc) continue;
thh[ii]=this[ii];
}
return(thh); // same as this without the methods
}
for(ii in this) ownfunc[ii]=1; // save all known methods
for(ii in ini) this[ii]=ini[ii]; // initial keys
}
function timedCount() {
ccc=0;
glb=hh.keys();
document.getElementById('txt').value=c+" "+ccc;
c=c+1
t=setTimeout("timedCount()",100)
}
function stopCount() {
clearTimeout(t);
}
var hh=new hash();
var rr=new myrand(10000000);
// create hash of 900000 keys
for(i=0;i<900000;i++) {
hh['a'+rr.myrand()]=1;
}
</script></head><body>
<form>
<input type="button" value="Start count!" onClick="timedCount()">
<input type="text" id="txt">
<input type="button" value="Stop count!" onClick="stopCount()">
</form><p>
Click on the "Start count!" button above to start the timer. The input field will count forever, starting at 0. Click on the "Stop count!" button to stop the counting.
</p></body></html>
sortkeys / sorthashvalue
[edit]// returns the sorted keys given a hash Array
// equivalent to "foreach $v (sort(keys(%src)))" in perl
// Use this to sort a normal "for (i in array); -> for (i in sortkeys(array));"
// Rev2: improved version. Can assign "hh=sortkeys(hh);"
function sortkeys(src, fun) { // fun is the sort function. optional
var nv = new Array();
var nvh = new Array(); // works ok bec of "closure"
var i;
for (i in src) nv.push(i);
if(fun==undefined) {
nv.sort();
} else {
nv.sort(fun);
}
for (i in nv) {
nvh[nv[i]]=src[nv[i]]; // Now transfer it to the keys
}
return(nvh);
}
// returns the sorted values.
// DOES NOT modify the src array
// e.g. aa["z"]=9; aa["zz"]=8; aa["a"]=2; for (i in sorthashvalue(aa)) { print(i); } // RETURNS 2, 8, 9
// Rev1: initial rev
function sorthashvalue(src, fun) { // fun is the sort function. optional
var nv = new Array();
var nvh = new Array(); // works ok bec of "closure"
var cnt=0;
var i;
for (i in src) {
nv[cnt++]=src[i];
}
if(fun==undefined) {
nv.sort();
} else {
nv.sort(fun);
}
for (i in nv) {
nvh[nv[i]]=1; // Now transfer it to the keys
}
return(nvh);
}
