invalid data path - no error

[maritimesource]

Hi,

I just wasted 2 hours trying to figure out why my data wasn't being displayed. The datapath I used was:
<view name="rowOfData" datapath="myData:profiles/profile">

When it should be "myData:profiles/profile"

Why doesn't the compiler or something complain about an invalid datapath?

Thanks

[Geoff2010]

probably because those are the same things.

[maritimesource]

Whoops!

When it should be "myData:/profiles/profile"

without that first slash I was getting a blank view. Just an amateur typo, but wondering why I didn't get a compiler warning or error.

Thanks

[Geoff2010]

it wouldn't be the compiler that would warn you about dataset issues. Most datasets are loaded long after the compiler has done it's work.

I am not sure if there is a way to get that condition to show up in the debugger. You could probably look at the base class to figure out what actually happens when the datapath is invalid.

[kdavies]

I have had this same problem, unfortunately if you think about it, it doesn't make sense for it to throw an error. Because a lot of times there might not be any data that matches that xpath at a particular moment and that might be perfectly fine. Maybe it would makes senses to have a mechanizism that you could mark a particular view so that it throws error whenever there is data and that datapath does not match anything. Maybe something like this (untested):


<view name="rowOfData" datapath="myData:profiles/profile">
<method event="ondata" reference="myData">
if(this.datapath.p==null){
Debug.error(this.name+".datapath ("+this.datapath.xpath+") failed to match anything");
}
</method>

[maritimesource]

Yea, what you are saying makes sense.

However, wouldn't this be invalid:

myData:profiles/profile


Where the slash is missing after the colon? If it is invalid, then that's a case where an error would be useful.

[comcrazy]

By using init method like below, I found out that the object is created. Then I used the isValid() to check the datapath and set the visible to true if is not valid. The object show.

<method name="init">
<![CDATA[
super.init();

/* Draw the frame */
this.drawframe();
axisdrawview.drawframe();

if (!this.datapath.isValid()) {
this.setVisible(true);
} else {
draw();
}
]]>
</method>