Vuejs check for a null or undefined value in a method

Question

I don't understand why I can't do

openAndFillModalSoin(soin)
        {
            this.show = true,   

            this.vDate = soin.date,
            this.vCategorie = soin.categoriesoin.name,
            //This can be null
            if(soin.rabaisraion){
                this.vReasonReduction = soin.rabaisraison.id;
            }

            this.vPaiement = soin.moyendepaiement.nam,
            this.vRefer = soin.referedBy,
            //This can be null aswell
            this.vGiftCard = soin.boncadeau.id,
            this.vVoucher = soin.bonreduction.id;

            this.vID = soin.id;
        },

The "if" parts doesn't work, it asks for an expression.

Steven Spungin · Accepted Answer · 2019-05-01 18:34:40Z

2

You have commas instead of semicolons ending the preceding line.

answered May 1, 2019 at 18:34

Steven Spungin

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1 Comment

Pouissante Over a year ago

Thank you, I'm sorry I'm having trouble with the use of semicolons and commas in js

Steven Spungin · Accepted Answer · 2019-05-01 18:13:48Z

1

if(soin.rabaisraion){
                this.vReasonReduction = soin.rabaisraison.id;
            }

This this code will run when the following is NOT TRUE soin.rabaisraion is the number 0, false, null, undefined, or an empty string.

To reiterate, the string 'false', the string '0' and and an array (empty or not) are all true.

Also, if soin is null or undefined, that will be a runtime error.

Perhaps you want this:

if(soin && soin.rabaisraion){
   this.vReasonReduction = soin.rabaisraison.id;
}

Regardless, add a log before to see what's going on:

console.log('checking soin', soin)
console.log('checking boolean soin', !!soin)
if(soin && soin.rabaisraion){
   this.vReasonReduction = soin.rabaisraison.id;
}

The '!!' will force the value to boolean.

answered May 1, 2019 at 18:13

Steven Spungin

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1 Comment

Pouissante Over a year ago

Actually, I can't even compile. I'll add a screen in edit

Vikram Biwal · Accepted Answer · 2022-02-25 12:54:13Z

0

//check undefined Array
if (typeof myArray === "undefined") {
    alert("myArray is undefined");
}

// check undefined object
if (typeof myObj === "undefined") {
    alert("myObj is undefined");
}

//check object property
if (typeof myObj.some_property === "undefined") {
    alert("some_property is undefined");
}

answered Feb 25, 2022 at 12:54

Vikram Biwal

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