[Xerte] Re: Xerte 2 : Combo box value is defaulting to "" why?

Kemp Johnathan johnathan.kemp at ntlworld.com
Wed Apr 6 17:27:57 BST 2011


"I think default should be On Page Load (the label) rather than pageLoad
(the data)."

I interpreted (perhaps incorrectly) that what you were saying here was that
rather than trying to pass a default value from the xwd file, I should
include in the script that received the data e.g. getPageID code to test for
a null value.

Since I was setting up a combo box to allow a user to select between playing
narration on page load or on user request I simply changed the order of the
options around so that playing on page load was the second option. Action
only needed to be taken if the second option was selected and selecting the
second option always returned the same value (whereas selecting the first
option might return "" or "onUserRequest". So it just kept the testing
simpler.

My experience during testing was that with respect to a combo box specifying
an optional property
1. No optional property added : property value = undefined.
2. Optional property added and wizard closed without selection of a value :
property value = ""
3. Optional property added and first option selected : property value = ""
4. Optional property added and second option selected : property value =
"second option value"
5. Optional property added and second option selected then first option
selected : property value = "first option value"

Kind regards

Johnathan

On 6 April 2011 16:21, Julian Tenney <Julian.Tenney at nottingham.ac.uk> wrote:

> Can do that, yes, if it doesn’t already work? I know some controls take
> default values, precisely because when an optional attribute is added, it
> adds a null value: did you try what I suggested? This code from the wizard
> suggest all optional properties will handle a default value.
>
>
>
> //add optional properties
>
> addPropListener = new Object();
>
> addPropListener.click = function(obj){
>
>
>
>        if
> (wizard.nfoObject.wizard[tree.selectedNode.nodeName][optProps.selectedItem.data].defaultValue
> != undefined){
>
>               tree.selectedNode.attributes[optProps.selectedItem.data] =
> wizard.nfoObject.wizard[tree.selectedNode.nodeName][optProps.selectedItem.data].defaultValue;
>
>        } else {
>
>               tree.selectedNode.attributes[optProps.selectedItem.data] = ""
>
>        }
>
>        tree.dispatchEvent({target:tree, type: "change"});
>
> }
>
> addProp.addEventListener('click', addPropListener);
>
>
>
> *From:* xerte-bounces at lists.nottingham.ac.uk [mailto:
> xerte-bounces at lists.nottingham.ac.uk] *On Behalf Of *Kemp Johnathan
> *Sent:* 06 April 2011 15:29
> *To:* Xerte discussion list
> *Subject:* [Xerte] Re: Xerte 2 : Combo box value is defaulting to "" why?
>
>
>
> Thanks for your help.
>
>
>
> It seems strange to me that a combo box / drop down menu should default to
> returning "" rather than the value of the first element in the list.
>
>
>
> Since the xwd file provides the data for the construction of the wizard, I
> guess the behaviour of the wizard is governed by the code that processes the
> xwd file and presents the wizard form to the user, and that this is a part
> of the core Xerte code. Would it be possible to update the code so that a
> combo box when run could have either a default value specified in the xwd
> file or alternatively that it just defaulted to returning the value of the
> first item in the list unless one of the other items had been selected?
>
>
>
> Kind regards
>
>
>
> Johnathan
>
>
>
> On 5 April 2011 15:09, Julian Tenney <Julian.Tenney at nottingham.ac.uk>
> wrote:
>
> I think default should be On Page Load (the label) rather than pageLoad
> (the data).
>
>
>
> *From:* xerte-bounces at lists.nottingham.ac.uk [mailto:
> xerte-bounces at lists.nottingham.ac.uk] *On Behalf Of *Kemp Johnathan
> *Sent:* 05 April 2011 15:07
> *To:* Xerte discussion list
> *Subject:* [Xerte] Xerte 2 : Combo box value is defaulting to "" why?
>
>
>
> Hello Xerte team,
>
>
>
> As far as I can tell this line is set up like many other optional property
> lines and I don't recall hitting this problem before
>
>
>
> In an xwd file I have the optional property
>
>
>
> <narPlayback type="ComboBox" label="Narration Playback" options="On page
> load,On user request" data="pageLoad,userRequest" default="pageLoad"
> width="150" optional="true"/>
>
> When the page wizard is opened and the Narration Playback property added
> and the page wizard closed, the value of narPlayback changes from undefined
> to ""
>
> If the page wizard is re-opened the combo box displays the selected value
> as "On page load".
>
> Clicking on the value "On page load" does not change the value from "" to
> "pageLoad".
>
>
>
> The only way I can actually set the value of narPlayback to "pageLoad" is
> to select the alternative option from the combo box i.e. "On user request"
> and then to select "On page load"
>
>
>
> What am I missing here?
>
> What do I need to do to ensure that when the optional property is added it
> receives the default value of "pageLoad"?
>
>
>
> Kind regards
>
>
>
> Johnathan
>
>
>
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