Having a problem with setTimeout("doSomething()", 5000) or, preferably, setInterval("doSomething()",5000), referring to a function:
doSomething() { // do something here }
-- where the do something is document.write("whatever") in order to write "whatever" to the screen repeatedly every 5 seconds. (Works okay for writing to a text box). Internet Explorer writes once, then gives message "Error on page"
8  4212  
Having a problem with setTimeout("doSomething()", 5000) or, preferably, setInterval("doSomething()",5000), referring to a function:
doSomething() { // do something here }
-- where the do something is document.write("whatever") in order to write "whatever" to the screen repeatedly every 5 seconds. (Works okay for writing to a text box). Internet Explorer writes once, then gives message "Error on page"
Here's what I'm thinking:
When you call document.write, it has to open the document object for writing. If you've already loaded a page, then it basically deletes the whole document and starts over. If you declared your code in the body of the script, then your script will be deleted (in the browser window, not your source code), and so when the browser goes to doSomething() 5 seconds later, doSomething doesn't exist.
Try either declaring your script in the document's head, or better yet, have doSomething create a node and append it to the body: -
function doSomething() {
-
var $newText = document.createElement('div');
-
$newText.appendChild(document.createTextNode('Hi!'));
-
document.body.appendChild($newText);
-
}
-
Thankyou, pbmods. (Sorry to have been slow trying your suggestion). Your code to create a node works perfectly. ..Is there a way of displaying the "Hi!" in random fonts, colours and sizes, in random placements on the screen? I know how to do this with document.write(name) but can't get it to work with the text node?? (What I'm working towards is amusing a child by by displaying his name in this manner).
Re the other suggestion of declaring the script in the document's head, I thought I was doing that: where did I go wrong?
<HTML> <HEAD>.... <SCRIPT TYPE = "text/javascript">
function doSomething()
{
document.write("Hi!");
setTimeout("doSomething()",5000);
}
</SCRIPT>
</HEAD>
<BODY> etc
u can do this by changing the style property at 5 seconds interval.
have a good day.
kind regards.
dmjpro.
-
function doSomething() {
-
var $newText = document.createElement('div');
-
$newText.appendChild(document.createTextNode('Hi!'));
-
document.body.appendChild($newText);
-
}
-
this type declaration ( $newText) .... does it mean something different than newText?????
plz help PBMODS.
kind regards.
dmjpro.
u can do this by changing the style property at 5 seconds interval.
have a good day.
kind regards.
dmjpro.
Thanks for your help
derrickn
this type declaration ($newText) .... does it mean something different than newText?
Nope. No difference whatsoever (except that '$newText' != 'newText' of course). I'm just a hardcore PHP guy, so I like to put a '$' in front of my variables so that I can easily identify them.
Thanks for your help
derrickn
dmjpro Could I request further help? I was able to select a font color and a background color by inserting (into pbmods code for creating a node) lines such as: document.body.style.color="red"; // this changed the font color, though
ditto.fontColor="red'" had no effect.
documen.body.style.backgroundColor="yellow"; // worked for background color
Question: how to set a different font face and size, and a different placement on the screen? Nothing I tried with document.body.style. worked for these things.
Thanks, derrickn
Question: how to set a different font face and size, and a different placement on the screen? Nothing I tried with document.body.style. worked for these things.
Font face is 'fontFamily', and font size is fontSize. Take a look at this reference here.
Note that when you have a hyphenated word (such as font-family), you have to camel-case it to use it in JavaScript (e.g., fontFamily).
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