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Dynamically update a form

thomas1000

I am trying to dynamically update a form so that when you enter text into one text box other things on the form, like other text boxes change.  This is such a common thing to want to do it seems like it ought to be easy but for some reason I haven't found the solution  I tried things like 

set(car(TheForm->fieldList) "Test")

Here TheForm was a variable set to the form ID.  I got the field list because in my form I have a variable number of fields and don't necessarily know the ID of each field.  In this example I was just trying to set the first text box field on the form to "Test".  That didn't work - the CIW echoed "Test" but the form didn't update.

Can anyone help show me how to update a form dynamically so that when one text field is changed by the user, another text field has its value changed?

  • You'd need to do:

    get(TheForm car(TheForm->fieldList))->value="Test"

    If you just do car(TheForm->fieldList), you'll get the symbol which is the name of the field. What you were doing was setting a property on the symbol, not on the form field. So what I'm doing is getting the the form field structure itself, and then updating the value.

    Note I would generally recommend against using fieldList - that's all very well until you then add a button or something else onto the form. Better would be to ensure that your fields are named deterministically by using something like concat('CLfieldThing count++) rather than gensym, and then record the number of fields on the form using TheForm->myFieldCount=count, or  record the fields that you generate using TheForm->myFields=listOfFields. Note you can add whatever properties you like on the form data structure, so it's useful to store related information.

    Regards,

    Andrew.

  • Thanks, Andrew,

    That works well.  A very helpful response.

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