need help on function "getelementbyID" and javascript

[wilbasket23]

i got some question about the "elementbyID" function. What does it use for? Can anyone give me an example explain this function!!!! Also, i wrote a javascript and save as .js file. How can i include this file to my html page. The problem that i am having right now is that i have 20 html pages. I want to use and include the .js file into every html page. I don't want to type or cut/paste the code into every html pages. Isn't there a way that i can include the .js file which contains all the necessary coding and insert into every html pages that i want to use the javascript. Can anyone help me with this!!!!

[dj4uk]

There is indeed a way to include the code in your pages.

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

Substituting example.js for a file with the javascript you want to include in each page.

[DrZaius]

Hi wilbasket23,

You include a script into an HTML file but adding this:

&ltSCRIPT SRC="myscript.js"&gt&lt/SCRIPT&gt

Where "myscript.js" is the name of your script.

Sorry, I don't know much about the ElementByID. I think it's used to call specific form elements on the page. Hope that helps.

[UncaDanno]

The above two examples will get the script included.
getElementbyID is used to retrieve an element from a page so you can process it.
For example, say you have a couple of input boxes, one where you have id="InputOne", the other you have id="InputTwo" in their attributes. You want to copy whatever the user types into InputOne over to InputTwo when the user clicks on a button on the page.

In the definition of the button, you could include onclick="CopyOver();". This would cause the CopyOver function to run when the button is clicked.

The CopyOver function would include the statement:

document.getElementbyID("InputTwo").value=document.getElementbyID.("InputOne").value;

The key is to identify the elements (id="InputOne").
As an alternative, you could give the elements names by using name="InputOne", etc., and retrieve them by using getElementsByName. Note that, when retrieving by name, it's "getElements" (plural) and when retrieving by id it's "getElement" (singular).