Don't see apex data

Question

I have such code:

JS

    @track messageBody;

    @wire(getDataFromController) 
    emailTemplate ({ error, data }) {
        if (data) {
            this.messageBody = data[0].Body; //EmailTemplate Object Body field value
            this.error = undefined;
        } else if (error) {
            this.error = error;
            this.record = undefined;
        }
    };

    get body(){
        return this.messageBody;
    };

    handleEmailTextChange(event){
        this.messageBody = event.target.value;
     };

HTML

            <template if:true={emailTemplate.data}>
                <lightning-textarea name="emailBody" label="Email Body" value={body} onchange={handleEmailTextChange}></lightning-textarea>
            </template>

When I click my quick action, I see all fields except this part. I suppose that is why if:true={emailTemplate.data}. But in debug mode I see my data.

What I made wrong?

Answer 1

I think you got confused with params.

if:true in LWC only expects value in true and false. And emailTemplate wired method error and data is not something which should be referred like you are referring.

So your <template if:true={emailTemplate.data}> should change to :

<template if:true={valueAvailable}>

---

valueAvailable = false;

@wire(getDataFromController) 
emailTemplate ({ error, data }) {
    if (data) {
        this.messageBody = data[0].Body; //EmailTemplate Object Body field value
        this.error = undefined;
        this.valueAvailable = true;
    } else if (error) {
        this.error = error;
        this.record = undefined;
    }
};