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Why in the code below upon the call of document.write in the function validator() the form elements (the checkbox and button) are removed from screen?
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function validator() {
if (document.myForm.thebox.checked)
document.write("checkBox is checked");
else
document.write("checkBox is NOT checked");
}
</script>
</head>
<body>
<form name="myForm">
<input type="checkbox" name ="thebox"/>
<input type="button" onClick="validator()" name="validation" value="Press me for validation"/>
</form>
</body>
</html>
995
The document. write() method writes a string of text to a document stream opened by document.
write() writes to the document without appending a newline on the end. document. writeln() writes to the document appending a newline at the end.
No. It's just most often considered bad practice and almost as misused as eval . Read: Why is document. write considered a 'bad practice'?
document.write() is used to write to the document stream.
In your case, the stream is most probably already closed when the onClick handler is called, because your document has finished loading.
Calling document.write() on a closed document stream automatically calls document.open(), which will clear the document.
120
A document.write() called after the page loads will overwrite the current document.
You want to set the text of some element within your document. If you add a
<p id="message"></p>
to the end of your body, then you can call
document.getElementById("message").innerHTML = "your text here";
Or with the jQuery library
$("#message").html("your text here");
Calling document.write after the document has been loaded implicitly calls document.open, which clears the current document. (Compare to calling document.open while the page is loading, which inserts the string into the document stream; it does not clear the document.)
document.write is one of the oldest vestiges of ancient JavaScript, and should generally be avoided. Instead, you probably want to use DOM manipluation methods to update the document.
27
you can use
alert("Checkbox is checked");
or if you will be displaying it on page, first create an element with an id "message" (you can write anything you want, but remember, id's have to be unique on the page) like
<div id="message"></div>
and then use
document.getElementById("message").innerHTML = "Checkbox is checked";
or if you are using jQuery:
$("#message").html("Checkbox is checked");
or if you are using a console enabled browser (Firefox, Chrome etc.)
console.log("Checkbox is checked");
instead of
document.write("Checkbox is checked");
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