in ADF lab 4.2.2, g_scratchpad does not work

[MaxonLiang]

in ADF course (Application Development Fundamentals (Zurich)), lab 4.2.2, two rules  are used to pass some data from server side to client side with g_scratchpad.

1. A "display" business rule, setting proerties to g_scratchpad

2. A client script, getting proerties from g_scratchpad and display a field in form

I strictly follow the guide in the course, except the "location_to_be_used" is replaced by me with "location_should_be_used" as the former one is not found, but this is not a matter.

When test above setting, I found client script get undefined values from g_scratchpad.

Then I make some debug:

1. Client script can display hard code value in "location_should_be_used" field.

2. Per some posts in community, in Client script side, I show content of g_scratchpad by getting keys with Object.keys(g_scratchpad), found only two keys/values in it,

browserSupported=true

isNewUI=true

there are no the properties set by business rule at all.

3. Per some posts in community, I rename the property in g_scratchpad with prefix 'u_', still not work

May I know what's the possible reason? Thanks.

below are details of the two rules, including my debug codes

business rules

code

 

(function executeRule(current, previous /*null when async*/) {

    g_scratchpad.city = current.requested_for.city;

    g_scratchpad.country = current.requested_for.country;

    g_scratchpad.u_city = 'city222';

    // Hooray for dotwalking!

    // By writing these values to the scratchpad, a client script can easily fetch them.

})(current, previous);

client script

function onLoad() {

    // This uses the dotwalking superpowers of the Scratchpad to use the requestor's city & state as the default location to be used. Make sure whomever you use for testing has values in their user record for this!

    if (g_form.getValue('location_should_be_used') != '') {

        return;

    }

    var city = g_scratchpad.city;

    var country = g_scratchpad.country;

    if (city && country) {

        g_form.setValue('location_should_be_used', city + ', ' + country);

    } else if (city) {

        g_form.setValue('location_should_be_used', city);

    } else if (country) {

        g_form.setValue('location_should_be_used', country);

    }

var u_city = g_scratchpad.u_city;

    var items = Object.keys(g_scratchpad);

//g_form.setValue('location_should_be_used', 'country111aaa'+'-'+u_city+'--'+country); // this return undefine for u_city and country

g_form.setValue('location_should_be_used', 'items len='+items.length+'item[1]='+JSON.stringify(g_scratchpad[items[1]]));

    if (city || country) {

        g_form.showFieldMsg('location_should_be_used', 'Value set automatically - you may override by editing', 'info');

    }

}

[Tanushree Maiti · Accepted solution]

Hi @MaxonLiang ,

If you’re seeing a g_scratchpad is not defined error, it usually means that no data has been passed to the g_scratchpad variable from the Display Business Rule.

This often occurs when the rule doesn’t include any logic to assign values to g_scratchpad.

Loaner request is custom table. from which table this custom table extends.

Asking because requested_for is OOB if field. If your custom table is not extending anything ,in that case requested_for  should be a custom field like u_requested_for.

Validate field name from your table. Pass the same to your Display  BR.

[MaxonLiang]

Despite requested_for  is valid or not, as we can see, i make another field u_city in the BR that hard code to a string

  g_scratchpad.u_city = 'city222';

however, in client script side, g_scratchpad.u_city is still undefined

[MaxonLiang]

A new finding, once i comment out below two lines in BR

// g_scratchpad.city = current.requested_for.city;
// g_scratchpad.country = current.requested_for.country;
then
g_scratchpad.u_city can be access normally in client script side.
So, seems we can say, once any undefined field is added to?g_scratchpad, even any valid field added later do not work, as?g_scratchpad seem has been "destroied" by the?undefined field.
Next? I will further check why?current.requested_for.city is undefined, though I had set it on the request for user per the lab requirement in advance .
Thanks for your prompt!

[MaxonLiang]

Finally it's found that

current.requested_for

should be

current.request_for

the field name is incorrect in the lab course🤣