Passing variable value from sightly to sling model

[#1]

I want pass list index value to sling model.

<sly data-sly-list.img="${guide.itemsList}">
<span>index:  ${imgList.index}</span>

<sly data-sly-use.multi="${'com.mycom.....MultiField' @ index=${imgList.index}' " />

This gives me null value at model. I tried to with pass with quotes , it gets passed as string.

Can any one help me to resolve this?

[LaMind3 · Accepted solution]

Hi @LaMind3 

After debugging able to find root cause for this issue, its because of datatype mismatch & datatype of itemList.index value is long. please use below updated code where datatype is changed from int to long, value will be injected as expected & it will resolve the issue.

Sightly:

<sly data-sly-use.multi="${'com.mycom.....MultiField' @ index = imgList.index}" />

Model Class:

@Model(adaptables = SlingHttpServletRequest.class, defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL)
public class MultiField{

@Inject
private long index;

}

- Manjunath

[LaMind3 · Accepted solution]

@Manjunath_K, Thanks, this fixed the issue. Updated int to long..

[Manjunath_K · Accepted solution]

@LaMind3 

You’re welcome 🙂

[Manjunath_K]

you are missing

@RequestAttribute(name = "index")
private String index;

Please check example here

https://github.com/arunpatidar02/aem63app-repo/blob/master/java/ParamModel.java

[Manjunath_K]

Hi @Arun_Patidar 

Using @Inject also we can access request attribute. i think @LaMind3 is missing to add SlingHttpServletRequest in adaptables so its not injecting the value.

@Inject
private int index;

[LaMind3]

@Manjunath_K, my model class is SlingHttpServletRequest adaptable, when I pass @ index = 2 it works, but when I pass imgList.index it does not take dynamic value. It always gives 0 when I make it as int, null when it is String

[LaMind3]

Hi @LaMind3 

Please find below mentioned corrected syntax & try with this.

Sightly:

<sly data-sly-use.multi="${'com.mycom.....MultiField' @ index = imgList.index ,context='number'}" />

Model Class:

@Model(adaptables = SlingHttpServletRequest.class, defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL)
public class MultiField{

@Inject
private int index;

}

[LaMind3]

@Manjunath_K, I tried this it gives me null value

[Manjunath_K]

@LaMind3 

Try above highlighted updated code, add context='number'  & change datatype from String to int. 

[LaMind3]

@Manjunath_K, I tried with int in model , but it always passes 0 instead of dynamic value. I added ,context = "number" but this didnt help me ..

[Manjunath_K]

@LaMind3 

I verified this code in my local instance & it works fine. please find below debug screenshot where index variable injected with value '2'.

i will suggest you to cross check whether your model class is SlingHttpServletRequest adaptable, if 'yes' then check printing index value(which you are passing to model class) in p tag to make sure proper value is sent to model class.

Sightly:

<sly data-sly-use.multi="${'com.mycom.....MultiField' @ index = 2,context='number'}" />

Model Class:

@Model(adaptables = SlingHttpServletRequest.class, defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL)
public class MultiField{

@Inject
private int index;

}