📄 onkeydown.htm
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<TITLE>onkeydown Event Sample</TITLE>
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function fnTrapKD(){
if(oTrap.checked){
oOutput.innerText+="[trap = " + event.keyCode + "]";
event.returnValue=false;
}
else{
oOutput.innerText+=String.fromCharCode(event.keyCode);
}
}
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<BLOCKQUOTE>
<H1>onkeydown Sample</h1>
<P>This sample demonstrates the implementation of the <b>onkeydown</b> event. As of Internet Explorer 5, most keys that fire the <b>onkeydown</b> event are cancelable.</P>
<P>Type some text into the <LABEL FOR=oExample>Example Text</LABEL> field.
If the <LABEL FOR=oTrap>Cancel onkeydown Event</LABEL> check box is checked, the key strokes do not show up in the text field, and "[trap]" is displayed in the <b>TEXTAREA</b> element. If the check box is not checked, the key strokes are displayed in both the text field and the <b>TEXTAREA</b> element.</P>
<FIELDSET>
<LEGEND>onkeydown Sample</LEGEND>
<P><LABEL FOR=oTrap>Cancel onkeydown Event:</LABEL> <INPUT TYPE=checkbox ID=oTrap></P>
<LABEL FOR=oExample>Example Text:</LABEL> <INPUT ID=oExample TYPE=TEXT onkeydown="fnTrapKD();alert(oExample.value);">
<P>
<TEXTAREA ID=oOutput ROWS=10 COLS=50>
</TEXTAREA>
</FIELDSET>
</BLOCKQUOTE>
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