[TAP5-2301] Select needs a context to properly participate in AJAX pages

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 5.3, 5.4
• Component/s: tapestry-core
• Labels: month-of-tapestry
• Assignee: Thiago Henrique De Paula Figueiredo
• Reporter: Geoff Callender
• Created: 15/Mar/14 07:01
• Updated: 24/Aug/15 08:40
• Resolved: 28/May/14 13:14

Description

This is a request to bring Select into line with Form, EventLink, and ActionLink, which already have a context.

There are two issues:
1. Currently a containing component, C, can't handle 2 or more AJAX Select components. When one Select sends an event, C has no idea of the value of the other. A context would be a good place to carry this info.
2. A deeply nested component, C, cannot handle an event from an AJAX sub-component unless C can reconstruct its context, ie. C has to be able to restore its parameters. A context would allow this.

This issue was discussed more fully in "Discussion on all AJAX requests needing context": http://apache-tapestry-mailing-list-archives.1045711.n5.nabble.com/Discussion-on-all-AJAX-requests-needing-context-tt5726132.html

I propose that server-side, Select triggers a new event with the context parameters before it triggers ON_VALUE_CHANGED, e.g..

@Parameter
private Integer myParameter;

public void onPrepareFromMySelect(Integer myParameter, String otherSelectsValue) {
this.myParameter = myParameter;
this. otherSelectsValue = otherSelectsValue;
}

public void onValueChangedFromMySelect(Integer myChoice) {
// Do something then return zone(s).
}

Grid needs a context too but it looks like I'm not authorised to tag it as a related issue: https://issues.apache.org/jira/browse/TAP5-2297 .

Issue Links

• is blocked by: TAP5-2490 Autocomplete and Select context values does not work when context has to pass through a value encoder
• is duplicated by: TAP5-2247 AJAX Select could bubble up PREPARE event
• is related to: TAP5-2297 Grid needs a context to properly participate in AJAX pages
• is related to: TAP5-2247 AJAX Select could bubble up PREPARE event
• relates to: TAP5-2329 Autocomplete needs a context to work in a Loop