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Field Events

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  • johnkoh
    replied
    Re: Field Events

    Hi,

    My Script is working fine if it triggers on Form(Browse) events as Ted and Stan mentioned.

    Here, as Ted asked me.
    What is the application?
    Why are you looking up on a separate table?
    What are you intending to write to the 3rd table?
    (1) I have a Price Book with product structure. Basically, One Brand(Product) has many Vendors and their price records with effect date.

    (2) The 3rd table ("Discount") has a vendor, his discount rate with effect date. Our vendor has the discount rate their List price books by each Product.

    (3) My PriceBook table has a List Cost and Net Cost fields. The Net cost is Calculate field with "List Cost - (list cost * discount rate)" so My intention is whenever I add or edit the PriceBook table date field value, Read the Discount table and get the Discount Rate.

    Leave a comment:


  • CALocklin
    replied
    Re: Field Events

    I'll let Ted and others handle the basic question but I need to add this for anyone who thinks you need to use .Resynch()

    (BTW, they're right - a better description of the what you want to accomplish is needed. Not a description of how you want to do it but what end result you want to accomplish. Now, back to my original thought...)

    Do NOT use table.open() when working with a table related to a form or browse that should show the results of your change. That is the wrong thing to do! It's a bad thing! Don't do it unless nothing else works!

    This is the voice of experience speaking. BTDT for many hair pulling years before I finally figured this out. Life is much more relaxed now. (At least in this one regard.)

    Note that I did NOT say "Never use Table.open()". I said "Don't use Table.open() when working with a table related to a form or browse that should show the results of your change.

    Stan's comment that, "table.open("PriceBks") is opening a new instance of PriceBks so the record pointer is likely on the first record when the code starts" is absolutely correct but it needs to go a step further. Not only is it a "new instance" but the form you're working on has no idea what happens in that "new instance" so it becomes difficult to update the form - sometimes so difficult that the only solution is to close the form, re-open it, and find the original record. (I've actually done that in production applications in the past before I learned to use table.get().) However, if you get a pointer to the same instance of the table that the form is using by using Table.GET(), then you may not have to do anything to get the changes to show up in your layout - it often happens automatically or with a simple parentform.refresh_layout() - no .resynch() required.

    Another advantage of table.get() when it points to a child table is that a .fetch_first() will take you to the first record that matches the current parent record and you can fetch through the child records until .fetch_eof() returns .T. when you try to fetch past the last child record.
    Last edited by CALocklin; 05-07-2010, 12:00 AM.

    Leave a comment:


  • Ted Giles
    replied
    Re: Field Events

    I could do with a little more tha that.
    What is the application?
    Why are you lookig up on a separate table?
    What are you intending to write to the 3rd table?

    On_Change will trigger your scripts, but beware changing in a Browse within a Form and expecting it to work as expected.

    I'm on client site until the weekend, but will reply then.

    Ted

    Leave a comment:


  • johnkoh
    replied
    Re: Field Events

    Hi Ted,

    I want whenever Current browse value changed then look up a value from 3rd table and save to current table.

    Leave a comment:


  • Ted Giles
    replied
    Re: Field Events

    Let's try it without all that code and stuff as Alpha inntended.
    John, what is it you need to do. Can you describe it please?

    Leave a comment:


  • Stan Mathews
    replied
    Re: Field Events

    while .not. tbl_pointer.fetch_eof()

    while tbl_pointer.fieldname = some_value

    for example.

    Leave a comment:


  • johnkoh
    replied
    Re: Field Events

    Stan,

    What did you mean for "Some Logical Test" ?

    I can think about Mode_get() or <tbl>.fetch.

    I replaced with <tbl>.table_get(). I want to search and save a current record whenever I add or changed the field("start date") value.

    Leave a comment:


  • Stan Mathews
    replied
    Re: Field Events

    1st record get the field value but 2nd record does not
    The person doing the coding is responsible for moving the record pointer to the record(s) to which they want to write if it is not the current record. I can't tell from your code that you have queried PriceBks for any particular field value.

    table.open("PriceBks") is opening a new instance of PriceBks so the record pointer is likely on the first record when the code starts. (instead of using table.current(n) which would have you on the current record visible on the form)

    Whatever you decide to do with the table pointer you must wrap the write code in some loop to process more than one record like

    Code:
    'Write to table	 
    while some logical test = .F.
          'tPrcBk.change_begin()
              tPrcBk.discount_rate = vDiscRate
          'tPrcBk.change_end(.t.)
    tPrcBk.fetch_next()
    end while
    The suggested loop may not be exactly what you want in your situration. I can't tell.
    Last edited by Stan Mathews; 05-03-2010, 11:25 AM.

    Leave a comment:


  • johnkoh
    replied
    Re: Field Events

    Stan,

    I think my coding (Write to table) is wrong because 1st record get the field value but 2nd record does not. I used the "OnWroteField" Rule.
    Code:
    'Setp 1 - Current PriceBook 	
    	tPrcBk = table.open("PriceBks")
    		vCurVndr = tPrcBk.Prdctvndr_id
    		vCurStart = tPrcBk.pbk_start_date
     
    'Setp 2 - Find Vendor Id from PrdctVndrs Table	    
    	tPrdVndr = table.open("Prdctvndrs")
    	Query.filter ="prdctvndr_id="+quote(vCurVndr)
    	iPrdVndr = tPrdVndr.query_create("n",query.filter)
    	  
                  vPrdVndrId = tPrdVndr.Seriesvndr_id
                  
    'Setp 3 - Find the Discount Rate from PriceDiscount table by vPrdVndrID and date
    
                    dim iPrcDisc as p
                    dim rPrcDisc as n
                    dim vDiscRate as n
                                	
    			    tPrcDisc = table.open("PriceDiscount",FILE_RO_SHARED) 
    			    query.filter = "Seriesvndr_id ="+quote(vPrdVndrId)+".and. between("+s_quote(vCurStart)+",Startdate,enddate))" 
    	            iPrcDisc = tPrcDisc.query_create("n",Query.filter) 
    		        rPrcDisc = tPrcDisc.records_get()
    			        if (rPrcDisc>0) then
    			        	 vDiscRate = tPrcDisc.Discount_rate
    			        else
    			             ui_msg_box("Record","No Discount Rate on this Vendor")	 
    			        end if	 
    'Write to table	 
    
          'tPrcBk.change_begin()
              tPrcBk.discount_rate = vDiscRate
          'tPrcBk.change_end(.t.)
          
    'Refresh a form
    ':browse6.refresh() 'Incorect Data Type
    'parentform.browse6.refresh()
    parentform.commit()
    parentform.browse6.resynch()
    'parent.browse6.refresh()   'Parent not found
    
    'parent.browse6.resynch()

    Leave a comment:


  • Ted Giles
    replied
    Re: Field Events

    Jon, I do quite a bit of this as I have some complex refreshes etc.
    When you get more details Stan will certainly have the answer and I'll chip in too.

    Leave a comment:


  • Stan Mathews
    replied
    Re: Field Events

    Which action of the field or Record Events (Field Rules) is right one?
    There is no "right one". It depends on the situation. Field rule events may not even be the right events. Forms have events as well which may be better suited. More details are necessary.

    How do you refresh form (or Browse) or Can I refresh only one object(a field which my script added the value)?
    Probably want to resynch the form to the table to reflect the change.

    Leave a comment:


  • johnkoh
    started a topic Field Events

    Field Events

    Hi All,

    I like to fire my scripts whenever I add New or changed a field value from the Form or Browse layout.
    Which action of the field or Record Events (Field Rules) is right one?

    Any of those events, How do you refresh form (or Browse) or Can I refresh only one object(a field which my script added the value)?
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