Simple TextBox question

[KevinFWB]

I'm trying to use a variable to write to a textbox and I can't seem to nail the syntax. I've tried searching but I couldn't find anything (probably because I don't know what exactly to search for).

document.fast.textbox1.value=23;
works fine.

however,
variable = textbox1;
document.fast.variable.value=23;
does not.

I've tried several different variations of adding braces, brackets and quotes, but I can't seem to nail it. I'm using JavaScript to auto populate textBoxes in a PHP form. My JavaScript knowledge is extremely limited.

Thanks for your help

-Kevin

[Kravvitz]

Welcome to WebDeveloper.com Forums, Kevin.

Perhaps this will help.

[KevinFWB]

I've read that entire page and I've tried everything I can think of.
I just can't seem to get the function to populate the textBox using a variable.
Do you have any other suggestions or code to try?

Thanks again for your help
-Kevin

[Kravvitz]

This is what that page showed applied to your example:

variable = 'textbox1';
document.fast.elements[variable].value=23;

[KevinFWB]

That was it - I can't thank you enough.

I was trying getElementsByID[variable] and getElementsByName[variable]

Thanks again
-Kevin

[Kravvitz]

You're welcome

There is no getElementsByID. Since IDs should be uniquely applied to one element in a document.

getElementByID() (singular) and getElementsByName() are methods of document and use parentheses, not array notation brackets the way arrays and NodeLists do.