How to call multiple functions from "change" attribute in Lightning Component?

Question

i need to call two functions at same time from change attribute in input checkbox component.

I have two function, one is generic(Say SaveFunction) and another function(do some calculation). i tried one way as binding expression such

{!c.saveFunction + c.calculateOpptyValue} 

the above code didnt work and i know another workaround calling another help in generic function , but i dont want implement any unnecessary logic in generic function.

Please let me know how can i do first way in calling the multiple functions.

Answer 1

You can call c.calculateOpptyValue from the c.saveFunction funtion Example:

c.saveFunction(){
  console.log('===');
  calculateOpptyValue(); //Call functions here
} 

Answer 2

Just to extend the idea of @Krishna Bidwai , If you need to call c.calculateOpptyValue from c.savefunction for only one button, below approach can be used :

On your button add a div with an attribute such as

<div onclick="{!c.savefunction }" data-value="abc">
    <lightning:button label="Save" iconPosition="left" value="123"/>
</div>

in your controller function :

   savefunction  : function(component, event, helper) {
        var currentEvt = event.currentTarget;
        var data_Value = currentEvt.dataset.value;
        console.log(data_Value);
    if(data_Value == 'abc'){
    calculateOpptyValue();
    }
}

For more information on above technique , refer below answer from @Caspar Harmer: What is the correct way to pass Parameters to Lightning JS controller from UI:Button?