[SalesForce] Can’t set lightning component controller

I am following the Trailhead "Create a Lightning Component" tutorial and I have reached the part where I have build the controller (Apex) and I am attempting to set the aura:component controller.

My Developer org has a namespace prefix set due to an earlier tutorial and I think it is conflicting. When I try and set the controller:

<aura:component controller="MyContactListController">

</aura:component>

I receive the following error:

Failed to save undefined: No CONTROLLER named
apex://devprefix.MyContactListController found: Source

any idea why my controller is not being accessed under the namespace prefix? In case you are wondering I am posting the contents of the apex class below:

public class MyContactListController {
    @AuraEnabled
    public static List<Contact> getContacts() {
        return [Select Id, Name, Email, Title, Phone From Contact];
    }
}

Any help would be appreciated.

Thanks in advance!

Best Answer

I was able to recreate the issue, and although I don't know what is causing it, I was able to get past it by changing the name of the apex class:

public class MyContactListControllers {
    @AuraEnabled
    public static List<Contact> getContacts() {
        return [Select Id, Name, Email, Title, Phone From Contact];
    }
}

and then making the corresponding change in the component:

<aura:component controller="MyContactListControllers">

</aura:component>

Oddly after doing that, I could revert them back to their previous names and they would save without issue.

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Typically, when I get a apply of undefined error, it's related to a syntax error in my JavaScript.

The way I address this is to run the lightning linter, which is a CLI tool, that's part of the heroku toolbelt. Check out the "Install Lightning CLI" and "Use Lightning CLI" links here: Salesforce Lightning CLI for more information on the linter.

I ran the linter with your javascipt and it pointed out the following syntax error:

FILE: testHelper.js:

error Parsing error: Unexpected token ) Line:4:48 action.setCallback(this, function(response)){

It looks like you have too many ")" right before that curly brace. Fix that, re-run the linter, and then see if your apply of undefined error goes away.

Sometimes these syntax errors also result in "Invalid Pages" in the Napili template too, so just be very diligent about running the lightning linter while you're developing those components.

Edit: Look closer, because your syntax is still incorrect. You also have a few additional typos, including "componnet". The following syntax passed the linter validation:

({
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        var action = component.get("c.getOR");
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[SalesForce] Can’t get object property in lightning component controller

Your JSON [{"name":"xxx","documentId":"xxx"}] looks like an array, not an object.

Change the way you get the docId to

var docId = uploadedFiles[0]["name"]; or var docId = uploadedFiles[0].name;

and the loop to

for (var key in uploadedFiles[0]) {

Best Answer

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[SalesForce] community error Component class instance initialization error Cannot read property ‘apply’ of undefined] Failing descriptor

[SalesForce] Can’t get object property in lightning component controller

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