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value change

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Sep 11.2005

i want to have a button thats value canges to a pre-defined variable when clicked but i dont know how to write it so far i’ve got

<HEAD>
<SCRIPT….>
….
var message = “jam”;
….
</SCRIPT>
</HEAD>
<BODY>
…….
<INPUT type=”button” value=”click” onClick=”this.value=message;”>
…….
</BODY>

but it just says there’s an error in the onClick part.
can you help or show an example???

if unclear just post to say and i will rectify

to post a comment
JavaScript

5 Comments(s) ↴

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@vwphillipsSep 11.2005 — it works ok
[CODE]
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>
<title></title>
</head>

<body >
<HEAD>
<SCRIPT>
var message = "jam";
</SCRIPT>
</HEAD>
<BODY>
<INPUT type="button" value="click" onClick="this.value=message;">
</BODY>
<br>
<br>

</body>

</html>
[/CODE]
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@jamauthorSep 11.2005 — ok

but then i dont see why this doesn't work:


<HTML>

<HEAD>

<TITLE>

If You Don't Have A JavaScript Enabled Browser This Will NOT Work

</TITLE>

<SCRIPT Language="javascript">

<!--

var speed = 1000;

var msgNo = 0;

function messageChange() {

var msg1 = ">>>JAM<<<";

var msg2 = "..>>JAM<<..";

var msg3 = "....>JAM<....";

var msg4 = "......JAM......";

var finalMessage = "";

if (msgNo==0){

finalMessage = msg1;

msgNo = 1;

}

else{

if (msgNo==1){

finalMessage = msg2;

msgNo = 2;

}

else{

if (msgNo==2){

finalMessage = msg3;

msgNo = 3;

}

else{

finalMessage = msg4;

msgNo = 0;

}

}

}

window.status = finalMessage;

document.title = finalMessage;

}

window.onLoad = setInterval("messageChange();",speed);


//-->

</SCRIPT>

</HEAD>

<BODY>

<INPUT type="button" value="click" onClick="this.value=finalMessage;">

</BODY>

</HTML>

can u help?
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@vwphillipsSep 11.2005 — [CODE]<HTML>
<HEAD>
<TITLE>
If You Don't Have A JavaScript Enabled Browser This Will NOT Work
</TITLE>
<SCRIPT Language="javascript">
<!--

var speed = 1000;
var msgNo = 0;

function messageChange() {

msg1 = ">>>JAM<<<";
msg2 = "..>>JAM<<..";
msg3 = "....>JAM<....";
msg4 = "......JAM......";
finalMessage = "";

if (msgNo==0){
finalMessage = msg1;
msgNo = 1;
}
else if (msgNo==1){
finalMessage = msg2;
msgNo = 2;
}
else if (msgNo==2){
finalMessage = msg3;
msgNo = 3;
}
else {
finalMessage = msg4;
msgNo = 0;
}
}
//-->
</SCRIPT>
</HEAD>
<BODY onload="messageChange();" >
<INPUT type="button" value="click" onClick="this.value=finalMessage;messageChange();">
</BODY>
</HTML>
[/CODE]
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@CharlesSep 11.2005 — Because by using "var" when you defined "finalMessage" inside a function you made it a property of the call object. And the call object gets destroyed when the function returns. You want it to be a property of the Window object which it will be if you remove the "var". It would be, however, better programming to move the whole line to outside and above the function.
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@jamauthorSep 11.2005 — cheers i've got it sorted it
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