Place default checkbox value "in SESSION" on initial page load

Question

Oracle 11.2
Apex 4.1
Desire outcome: Chart renders on inital page load using default value of checkbox in query.
I have a checkbox with a default (checked) value. It shows checked when the page renders for the first time but the value is not in the SESSION state. I use this value in a query for a chart. I do not want to use a Submit button so I have a dynamic action submitting the value for the checkbox and the chart refreshes as desired when I check and uncheck the box.
I tried "Fire on Page Load" in the DA Execution Options, as well, but that caused a loop where the page renders and immmediately renders, and immediately renders, etc.
Is there a declarative solution that submits the current, in this case default, values when the page is loaded? I only need and want the default values used the first time the page is accessed. This is the initial page of the application but I need the same behavior on all pages for the separate checkbox selections found there.
May God Bless,
Howard

Answer 1

Howard (DBA in Training) wrote:
If I remove the Default Value and add a Before Header page computation for the item with static assignment to
a:bI get the 2 A/B checkboxes, both checked, and the value is set in session state.If you log in here, you can see it up close and personal!
http://apex.oracle.com/pls/apex/f?p=21997:3 Login: Dever / Ima9Dever
The Default Value colon-delimited string must contain the checkbox values, not the labels. In a static LOV the checkbox options are specified as <tt>label;value</tt> pairs. Thus in your checkbox LOV the labels are A/B, whilst the values are a/b. The values are case-sensitive.
The Default Value should therefore be:
a:bwhereas you've specified:
A:BWith the checkbox item LOV Display Extra Values property set to Yes, APEX displays these extra values that are not included in the LOV definition as additional checkboxes. You can see this if you inspect the rendered checkbox elements in the HTML source:
<input type="checkbox" id="P3_CHECKBOX_0" name="p_v01" value="a">
<input type="checkbox" id="P3_CHECKBOX_1" name="p_v01" value="b">
<input type="checkbox" id="P3_CHECKBOX_2" name="p_v01" value="A" checked="checked">
<input type="checkbox" id="P3_CHECKBOX_3" name="p_v01" value="B" checked="checked">You get the a/b values defined in the LOV, plus the extra A/B values the LOV knows nothing about.
==== ) How do you keep it from setting/resetting these values each time the
page is rendered?  The need is to do it only the very first time?  ( ====Put a Value of Item / Column in Expression 1 Is NULL condition on the Computation. Problem then is that the computation will be run if the user can [legitimately] deselect all of the checkboxes, either leaving you back where you started, or requiring the use of a further item to flag whether it is the really "the very first time" (which I find intellectually deeply unsatisfactory). This may be a sign that the control should really be a radio group that always has one option set, rather than a check box.