Expression Binding - custom function call

[Former Member]

Hi all,

I read about new features in sapui5 - function call in expression binding:

Expression Binding - User Interface Add-On for SAP NetWeaver - SAP Library

On this page is only information, that we should call f(...). I try call my function (from view controler) but without success. Maybe someone has working example how to use this new feature, how to define function in view controler and how to use it in XML View?

I found similar question on: http://stackoverflow.com/questions/31615837/call-controller-function-from-xml-binding-expression

But solution from above page: "{= f(checkSelectedItems, null, ${odata>CustomerId}) }" doesn't work.

Thanks,

Maciej

[former_member182372 · Accepted solution]

why would you use expression binding if you have to call function from controller anyway?

why dont use old formatter syntax?

{ parts : [ { path : 'odata>CustomerId' } ], formatter : '.checkSelectedItems' }

[Former Member · Accepted solution]

@Maksim, your solution with formatter works great, it solved my problem. But still I don't know how to use custom function in expression binding.

[Former Member]

I'm using version 1.30.8 of SAPUI5 with data-sap-ui-xx-bindingSyntax="complex"

What I would like to have a mechanism to check user rights, for example:

<List
                id="menuList"
                mode="None"
                items="{
                    path : 'menu>/',
                    sorter : {
                        path : 'order',
                        descending: false
                    }
                }">
                <items>
                    <StandardListItem
                        title="{menu>label}"
                        visible="{= hasRights(${menu>permission},${user>/user/perms}) }"
                        type="Active"
                        description="{menu>desc}"
                        icon="sap-icon://{menu>icon}"
                        press="handleMenuListItemPress" >
                        <customData>
                            <core:CustomData
                                key="id"
                                value="{menu>id}" />
                        </customData>
                    </StandardListItem>
                </items>
            </List>

Or

<Button type="Save" press="save"  visible="{=  hasRights(${menu>permission},${user>/user/perms}) }"/>

On backend side I have already implemented security mechanism to check user rights, but I would like have also some easy to use on browser side. Function "hasRights" can work like  jQuery.inArray.

Maybe is other way to do this in proper way, but I think that in documentation we should find some example or maybe information how to use custom function in expression binding.

[former_member182372]

the whole purpose of using expression binding is to eliminate simple formatter functions in controller

your case is not that, check here how i would implement it

JS Bin - Collaborative JavaScript Debugging

i did some debugging of that f(...) expression thing and it doesnt really looks promising, still haven't figured out how to call function from controllers instance.

[former_member182372]

and of course check

by

1. bootstrap contains  data-sap-ui-xx-bindingSyntax="complex" ?

2. Expression binding introduced with 1.28 version.

[santhu_gowdaz]

Expression binding is using for simple formatter function. so write the logic in xml view itself. and please share your code and your requirement.