Using eSQL to filter a “QuickFind” portalPosted: June 25, 2014
(Note – this is an update of an older post about filtering portals via relationships.)
The Requirement: A quick, user-friendly “spotlight” style search option, to filter a portal of people’s names.
Demo file: QuickFindDemo.zip
Here’s how the finished interface looks:
Using the FM’s nice “River” theme, we have a QuickFind box in which the user enters a string, and, as they type, the list expands or contracts to show matching records. (Note that the “Search” button in the screenshot is not part of this technique – that opens a popover in which the user can specify a number of other criteria – show only people over a certain age, who have attended this month, etc.)
The input field is a global field within the table to be searched. In this example, it’s called PPL::FILTERINPUT.
When this field is empty, it looks like this:
The magnifying glass icon and the “QuickFind” text are hidden, via the very useful “hide object when” feature, the condition here being “not IsEmpty (PPL::FILTERINPUT)”.
The portal showing the list of people’s names, plus other information as required, is based on a self-join. I’ve called the table occurrence PPL_PPL~filter with the self-join relationship defined as:
In the PPL table, “id” is the primary key. So the portal will show anybody whose id appears in the global field PPL::FILTERIDS. (We can ignore the “isDead” thing, which just excludes dead people from the list.)
So, how does PPL::FILTERIDS get populated?
The population of the match field involves two scripts, “Initiate filter” and “Filter portal”. The second one, which does the searching, ONLY runs after a given pause between the user’s keystrokes. This is important, because you don’t want the searching script to run every time the user presses a key – it would be too slow. The duration of the delay that you allow depends mainly on the typing speed of the user – I’ve settled on 0.35 seconds.
So, the first script, “Initiate Filter”, runs EVERY time the user presses a key – it’s an OnObjectModify triggered script attached to PPL::FILTERINPUT. This is what it does:
The script is passed two parameters, one is the name of the field that we want to populate (i.e. PPL::FILTERIDS), and the other is the object name (not the field name) of the input field – I’ve called mine “PeopleNameFilter”.
These two parameters are stored as global variables, for use in the subsequent script. (Note that I use the GSP custom function to “get” these parameter values – it’s available here on Brian Dunning’s site).
We then use “Install OnTimer Script” to schedule the searching script every 0.35 seconds – this has the effect of allowing the user that amount of time to press another key – if s/he modifies the field again within 0.35 seconds, the script runs again, and the new OnTimer Script replaces the previous one.
When the user has finished typing (i.e. 0.35 seconds has elapsed), the “Filter Portal” script runs. It looks like this:
If the input field is empty, we just initialise the multi-key field. This will have the effect of showing no records in the portal. We then use “Install OnTimer Script” again, with a zero interval, to cancel the repetition of the current script.
If we have an input string, we use a fairly straightforward ExecuteSQL statement to find the matching ids. Here’s the eSQL statement:
ExecuteSQL(“SELECT id FROM PPL WHERE searchableData LIKE ? ” ; “” ; “” ; “%” & PPL::FILTERINPUT & “%” )
PPL::searchableData, the field searched by the ExecuteSQL statement, is a concatenated text field, including whatever pieces of data you want to search on. (I’ve experimented with making this a calculated field, but have found it much more efficient to have it as a plain text field, updated by a script whenever relevant data changes.) In this case, the field is updated as:
lower(nameFirst & “ “ & nameLast & “ “ & address1)
So, at the end of all this, we have PPL::FILTERIDS populated with the primary keys of all records where matching text has been found (anywhere within the searchableData field – it doesn’t have to be at the beginning), and the portal showing those records. If there are NO matching records, we say so, then cancel the OnTimer script (by installing another (blank) one), and go back to where we came from.
Note that the use of parameters is optional, but makes it possible to use it elsewhere, should we need other similar QuickFinds.
As ever, please comment if you can suggest a better way of doing this. None of it is really of my own invention, and is documented here to remind myself of how it works, but if it’s of use to you, so much the better!