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How can I use a variable resolver with a ListBox.
I have tried the following approaches:
<?variable-resolver class="com.LovResolver"?>
<listbox mold="select" width="100px"
selectedItem="@bind(each.attributes.accountCategory.value)">
<listitem label="${each.value}" forEach="${country}" value="${each.code}"/>
</listbox>
The Lov display but the value in field accountCategory does not display.
OR
<listbox model="${country}" mold="select" width="200px"
selectedItem="@bind(each.attributes.accountCategory.value)">
<template name="model" var="lov">
<listitem label="${lov.value}" value="${lov.code}" />
</template>
</listbox>
The above code snippet throws errors.
Points to note:
1) My data source is a class that has a map of attributes.
2) I have implemented a variable resolver that returns the list of values as follows:
@Override
public Object resolveVariable(String name) throws XelException {
.... // some code here
List<GenericLOV> listOfValues = new ArrayList<GenericLOV>();
listOfValues.add(new GenericLOV(new Short("566"), "Nigeria"));
listOfValues.add(new GenericLOV(new Short("891"), "Yugoslavia"));
listOfValues.add(new GenericLOV(new Short("894"), "Zambia"));
ListModelList<GenericLOV> listModelLov = new ListModelList<GenericLOV>();
listModelLov.addAll(listOfValues);
return listModelLov;
}
3) The GenericLov is a class that has two fields
private Short code;
private String value;
with getters and setters
Your problem is not with variable resolver but rather the fact that your model contains different object than the selected value (which I assume is just a number (short))
Since you didn't provide any error messages or runnable code I can't comment on why things are not working in your attempt. Instead here my take on your scenario as a runnable ZK fiddle:
https://zkfiddle.org/sample/1002pcs/1-listbox-item-selection
Instead of your GenericLov I simply use a LinkedHashMap which is essentially the same.
Then I make sure the model contains only the Short numbers (which is the selected value as well), the display label is converted from Short to String using a @converter (For convenience I defined a read only converter for display purposes).
I expose both the list of countryCodes and the countryDisplayConverter via VariableResolver.
However a variable resolver is not necessary here (you could simply have getters on the viewmodel returning the list of country codes and the converter).
I hope this helps, feel free post a modified version of the example in case you have further questions.
I am just realising I made a mistake. The field in question (i.e. accountCategory) is a multi valued field. It returns List<short>.
So I adjusted your code snippet as follows:
<listbox model="@init(countryCodes)" mold="select" width="100px"
selectedItems="@bind(each.attributes.accountCategory.values)"
multiple="true">
<template name="model" var="countryCode">
<listitem label="@init(countryCode)
@converter(countryDisplayConverter)" />
</template>
</listbox>
The code works.
However, I also want to add that the previous code I shared now works as well.
<?variable-resolver class="com.LovResolver"?>
<listbox mold="select" width="100px"
selectedItems="@bind(each.attributes.accountCategory.values)"
multiple="true">
<listitem label="${each.description}" forEach="${accountCategory}"
value="${each.code}"/>
</listbox>
This code uses the generic lov class.
Good to know that zk offers different options to achieve the same functionality.
Thanks.
Asked: 2021-01-20 06:14:11 +0800
Seen: 12 times
Last updated: Jan 26 '21