Could you please explain why my JavaScript code isn't functioning as expected?
The intended behavior is for the 'mark' div to move to the current mouse coordinates upon clicking within the map.
Could you please explain why my JavaScript code isn't functioning as expected?
The intended behavior is for the 'mark' div to move to the current mouse coordinates upon clicking within the map.
When you open your console, the following error message will appear:
An error occurred: Cannot read property 'MouseX' of undefined
This error is on line 33 in your JavaScript code, where it seems that document.Show is undefined.
document.Show.MouseX.value = tempX;
Additionally, when you click, another error will be triggered:
Error: Cannot read property 'style' of null
This occurs around line 52 where mark is set to null:
<div id="map" onclick="
mark.style.left = tempX + 'px';
mark.style.top = tempY + 'px';
">
<div id="mark"></div>
To resolve this issue, consider moving the entire <script> tag towards the bottom, just inside the closing </body> tag. This adjustment will ensure that your document.getElementById('mark'); successfully locates the element.
Here's an example of how you can reposition the script:
<body>
<div id="map" onclick="
mark.style.left = tempX + 'px';
mark.style.top = tempY + 'px';
">
<div id="mark"></div>
</div>
<script type="text/javascript">
<!--
var IE = document.all?true:false;
if (!IE) document.captureEvents(Event.MOUSEMOVE)
document.onmousemove = getMouseXY;
var mark = document.getElementById('mark');
var tempX = 0;
var tempY = 0;
function getMouseXY(e) {
if (IE) { // grab the x-y pos.s if browser is IE
tempX = event.clientX + document.body.scrollLeft;
tempY = event.clientY + document.body.scrollTop;
}
else { // grab the x-y pos.s if browser is NS
tempX = e.pageX;
tempY = e.pageY;
}
if (tempX < 0){tempX = 0;}
if (tempY < 0){tempY = 0;}
document.Show.MouseX.value = tempX;
document.Show.MouseY.value = tempY;
return true;
}
//-->
</script>
</body>
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