> 
> Error ID: -270960303 This page has an error. You might just need to
>  refresh it. Error in $A.getCallback() [Cannot read property 'style' of
>  null] Failing descriptor: {c:CommunityBreakingNews}
> 
> 
> 

[![enter image description here](https://i.stack.imgur.com/ckpc3.jpg)](https://i.stack.imgur.com/ckpc3.jpg)

**Controller:**

```
({
    doInit : function(component, event, helper) {
        //var lWidth = window.innerWidth ;
        var lWidth = 400;
        window.setInterval($A.getCallback(function() { 
            helper.handleScroll(component, event,lWidth);
        } ), 20);
    }
})

```

**Helper:**

```
({
    handleScroll: function(component, event,lWidth) {
        var changeposition = component.get("v.scrollInterval");
        var floatElement = document.getElementById('toScroll');   
        if(changeposition < lWidth){
            floatElement.style.left = changeposition+'px';
            changeposition = changeposition + 1;
            component.set("v.scrollInterval",changeposition);
        }
        else{
            component.set("v.scrollInterval",0);
            floatElement.style.left = "0px";
            changeposition = component.get("v.scrollInterval");
        }
    }
})

```

**Style:**

```
.THIS#scrollDIV{
    border: 5px solid;
    border-radius: 6px;
    background: beige;
    height: 50px;
    margin: 5px;
    padding: 2px;
}

```