Document and Layer Event Capture and Release

Document and Layer Event Capture and Release : Browser Event : Window Browser JAVASCRIPT DHTML TUTORIALS

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Document and Layer Event Capture and Release



/*
JavaScript Bible, Fourth Edition
by Danny Goodman 

John Wiley & Sons CopyRight 2001
*/


<HTML>
<HEAD>
<SCRIPT LANGUAGE="JavaScript">
function setDocCapture(enable) {
    if (!enable) {
        document.captureEvents(Event.CLICK)
    } else {
        document.releaseEvents(Event.CLICK)
    }
}
function setLayerCapture(enable) {
    if (!enable) {
        document.layer1.captureEvents(Event.CLICK)
    } else {
        document.layer1.releaseEvents(Event.CLICK)
    }
}
function doMainClick(e) {
    if (e.target.type == "button") {
        alert("Captured in top document")
    }
}
document.captureEvents(Event.CLICK)
document.onclick=doMainClick
</SCRIPT>
</HEAD>
<BODY>

<B>Document-level and/or Layer-level capture of Event.CLICK</B>
<HR>
<FORM>
<INPUT TYPE="checkbox" onMouseDown="setDocCapture(this.checked)" CHECKED>Enable Document Capture
<INPUT TYPE="checkbox" onMouseDown="setLayerCapture(this.checked)" CHECKED>Enable Layer Capture
<HR>
<INPUT TYPE="button" VALUE="Button 'main1'" NAME="main1" 
    onClick="alert('Event finally reached Button:' + this.name)">
</FORM>
<LAYER ID="layer1" LEFT=200 TOP=150 BGCOLOR="coral">
<HEAD>
<SCRIPT LANGUAGE="JavaScript">
function doLayerClick(e) {
    if (e.target.type == "button") {
        alert("Captured in layer1")
    }
}
layer1.captureEvents(Event.CLICK)
layer1.onclick=doLayerClick
</SCRIPT>
</HEAD> 
<BODY> 
<FORM> 
&nbsp;layer1<BR><P><INPUT TYPE="button" VALUE="Button 'layerButton1'" 
    NAME="layerButton1" 
    onClick="alert('Event finally reached Button:' + this.name)"></P> 
<P><INPUT TYPE="button" VALUE="Button 'layerButton2'" 
    NAME="layerButton2" 
    onClick="alert('Event finally reached Button:' + this.name)"></P>
</FORM>
</BODY>
</LAYER>
</BODY>
</HTML>