Changing the Source of a Dataset at Run-time

[antun]

If you need to set or change the actual source (e.g. XML file) of a dataset at runtime, then you can call setAttribute() on the src attribute, and set the dataset to request data over HTTP:


<canvas debug="true">
<dataset name="foo" src="data_file_one.xml"
type="http" autorequest="true" />

<simplelayout axis="y" spacing="5" />

<button>Serialize the Dataset
<method event="onclick">
debug.write( foo.getPointer().serialize() );
</method>
</button>

<button>Switch to data_file_two.xml
<method event="onclick">
foo.setAttribute( 'src', 'data_file_two.xml' );
foo.doRequest();
</method>
</button>
</canvas>


Enjoy!

[a_ilyin]

What about grid?

Your approach don't work with grid if new XML has another structure because grid header don't update its header on changing data.

I workaround this manualy deleting old header. Is my solution is good. Is there other solutions?

<grid name="rightPane" width="${parent.width-treeView.width-10}"
height="${parent.height}" datapath="contactsData:/*"
showhscroll="true">

<method event="ondata">
<![CDATA[
var colCount = this.columns.length;
for(i=0;i<colCount;i++) {
this.columns[i].destroy();
}
this.columns=[];
this.init();

]]>
</method>


</grid>

[huntedman]

How do I select an item (row) from code...
FI have this mailbox with a tree (mail folders) and a grid (messages). When a user clicks a folder, I want the grid to select the first message...

Thanx,

Arthur.

[jsuen]

@huntedman: you can try selecting the first node of the array returned by your grid's dataset (or datapath array).

[perspolis]

Hi,

Destroying the coloumn and setting back to initialize does not work for me because the size of grid coloumn size does not stay the same and i also have checkbox in one of the columns which will be destroyed too.

any other solution?

thanks,

[balri]

If you need to set or change the actual source (e.g. XML file) of a dataset at runtime, then you can call setAttribute() on the src attribute, and set the dataset to request data over HTTP:

Enjoy!

I am trying to do this but get the src name from an XML file. Whenever I do I get an error saying "couldn't find dataset for prodSects:/sections/section"

My code looks like this:


<attribute name="filename" value="$path{'@filename'}" />
<dataset id="prodSects" name="prodSects" />
<handler name="oninit">
prodSects.setAttribute('src', filename);
prodSects.doRequest();
</handler>


The filename attribute is retrieved from another XML file and I can write this to the debugger without any problems. The code above is within a tabslider. I have put debugging comments in and confirmed that it's executing.

Any ideas what I'm doing wrong?