32
votes
Accepted
How do I debug my lightning component?
General Tools and settings:
use Chrome + built in Dev Tools + Lightning Component Inspector
be sure debug mode is enabled in your org (Setup: Lightning Components)
be sure caching is disabled in your ...
- 2,451
19
votes
Accepted
What are the outer parentheses in Lightning controllers?
This choice was made for two reasons.
We parse the Controller and Helper on the server to validate them. There are many different Java Parsers of JSON we could use, but regardless which we choose we ...
- 3,106
18
votes
Accepted
Helper method error: says is "Not a function"
I think the problem is with your doInit function. The helper is passed to the function as the third argument:
doInit : function(component, event, helper){
- 12.6k
14
votes
Accepted
Sharing JavaScript between multiple Lightning Components
Currently the recommended mechanism for this is to use a Static Resource and include it in any components that need to share the same JavaScript via ltng:require (loads the library once and only once ...
- 10.1k
12
votes
Accepted
lightning:input help -- keyCode
lightning:input does a bunch of validation and other stuff, but doesn't appear to support basic events other than blur, focus, and change events. However, if you want to add some basic key detection, ...
- 481k
12
votes
Accepted
Lightning response.getReturnValue() question
It is a JavaScript object - the JSON has already been parsed.
To inspect simple JavaScript objects use JSON.stringify:
console.log('currency data is:' + JSON.stringify(actionResult.getReturnValue()))...
- 135k
10
votes
Accepted
How to add extra data to a ui:button in a Lightning Component?
You could just extend ui:button and add an attribute. Eg,
<!--<c:myNewUIButton>-->
<aura:component extends="ui:button">
<aura:attribute name="someAttribute" type="string" /&...
- 20.3k
10
votes
Accepted
How to access child Web Component property from parent Aura Component controller?
Is it possible to read child Web Component property from parent Aura
Component?
Yes you can. you are trying to call a method or a property in your LWC component from aura component the LWC way but ...
- 7,765
9
votes
What are the outer parentheses in Lightning controllers?
The various parts - controllers, helpers and the XML components themselves - are all assembled into a valid single JavaScript file that represents the component. So the pieces you edit are in a ...
- 135k
9
votes
Accepted
eval() in Lightning Web Components
The syntax for the second eval() misses this keyword while referring object_1
connectedCallback() {
this.object_1 = "test";
console.log(" 1: " + eval("this.object_" + 1) + " 2: " + ...
- 35.8k
8
votes
Accepted
How to get the display density in a lightning components controller?
You can get Display density information using Salesforce User Interface API. This Link will help you. I don't think you can directly access Salesforce UI-API from Lightning controller, but you can use ...
- 498
8
votes
Accepted
How to load and use external library?
Using webcomponents and Jquery together can get bit tricky .
Here is how i approached this and got it working
1.Create a zip file that has latest jquery.min.js , pagination.js and pagination.css ...
- 90.4k
8
votes
Get records in Lightning web components without APEX
Another Update: With Spring '23, there is a pilot for the GraphQL wire adapter. This would allow you to perform a query on any UI API enabled object and get the records without needing apex.
import { ...
- 21.7k
7
votes
Accepted
Helper function not getting recognised intermittently
I believe the order of the params is wrong here:
function(component, helper, event)
Should be:
function(component, event, helper)
- 54k
6
votes
Accepted
lightning callback not firing
According to this post, "a javascript method name in a component controller can never be the same name in an apex lightning controller":
Enqueued action not executed in Lightning Component
Just need ...
- 633
6
votes
aura: method to call child component controller function not working
I did the following and it worked just fine.
So start here and add in stuff till it breaks. This is essentially what you posted since the rest of your code is missing.
Parent Component
<aura:...
- 54k
6
votes
Accepted
Component Initilization Error: cannot read property 'g'
Looks like your event handler declaration is causing the problem.
<aura:handler name="QuestionAddedEvent" value="{!this}" action="{! c.reloadQuestions }"/>
You should not be using value="{!...
- 2,119
6
votes
Accepted
Extracting a callback function
The controller of a component has no this context, only the helper does.
There are ways of calling one method from another via something like:
let action = component.get("c.cbFunction");
$A....
- 481k
6
votes
Accepted
Does more logic on Client side reduces the lightning performance?
Lightning Component Framework is optimized for performance. So unless and until you have things really going bad, you should be good if you implement your component using Lightning Components ...
- 30.3k
6
votes
Accepted
Lighting Components: Dynamically Call Aura Method
Sure, you can dynamically call aura method accessing a function through the bracket notation []:
var methodName = 'myMethod' ;
var childCmp = component.find('childCmp');
childCmp[methodName]();
- 7,444
6
votes
Accepted
LWC update toggle checked/unchecked attribute from JS
Just bind the checked attribute to javascript property.
<lightning-input data-id="toggle2" type="toggle" label="TOGGLE2" checked={checked} message-toggle-active="" message-toggle-inactive="">&...
- 11.9k
6
votes
Spread Operator Usage in LwC
The spread operator is a shallow copy operation. That means that while the arrays are separate objects, they both refer to the same element in every index. Let's provide a very simple example that ...
- 481k
5
votes
Accepted
$A.util.removeClass not working in some cases
Instead of doing things in init, try it in afterRenderer. Reason is that init is called long before DOM availability, which might cause a timing issue.
Incase of afterRenderer it is called only after ...
- 10.1k
5
votes
action.setCallBack() - call Back failed in lightning application
Your callback has an empty function body, because the second parentheses closes the function body prematurely. Honestly, I'm surprised this compiled at all. It should look more like:
getMyContacts : ...
- 481k
5
votes
Accepted
How to add dynamic variable to custom label in lightning javascript helper class
The framework provides a format function for this purpose e.g. with the label:
Hello {0} and {1}
the code could be:
{!format($Label.mySection.myLabel, v.attribute1, v.attribute2)}
- 135k
5
votes
Accepted
Locker Service and Fullcalendar.io
Logan, I just happen to have a sample of Fullcalendar which displays events. But heads up .. it is not locker compatible. even though I have used ( Full Calendar: 3.1.0 & jQuery 2.2.4 ) as ...
- 2,119
5
votes
urlEvent is undefined
Just a different way to slice the pie I guess but this puts the pieces where they belong IMHO and leave lightning in lightning and classic in classic
Lightning App
<aura:application access="...
- 54k
5
votes
Accepted
Lightning addEventListener to li
I'm going to assume that you have more than one <li> item for this answer.
You need to run this code in the renderer (or use the newly added event for Summer 17 - we'll use the renderer for now ...
- 20.3k
5
votes
Accepted
Is it possible to clear force:inputField?
Theoretically it should be possible to clear values on force:inputField. But in your specific case it seems not to work as expected. force:inputField is a smart field component operating on different ...
- 28.3k
5
votes
Scroll Page to top onClick of a button in Saleforce1
The propper syntax for scrollTo according to the documentation:
scrollTo('custom', 0, 0);
or
scrollTo('top');
I reproduced it, called the methods as documented and was also not able to scroll to top,...
- 6,359
Only top scored, non community-wiki answers of a minimum length are eligible