[SalesForce] Script Error in LWC

I'm trying to set values depending on the chosen variable of lightning-combobox so i created the following javascript

get timing() {
        return [
            { label: 'Weekly', value:'weely' },
            { label: 'Monthly', value:'monthly'},
            { label: 'Code',value:'code' },
        ];
    }

    handleMonthChange(event){
        this.month=event.target.value;
    }
    handleDoWChange(event){
        this.DoW=event.target.value;
    }
    handleTimingChange(){
    if (this.template.querySelector('timing').value="weekly"){
        this.minute='0';
        this.hour='0';
        this.DoM='*';
    }
    else if(this.template.querySelector('timing').value="monthly"){
        this.minute='0';
        this.hour='0';
        this.DoM='1';
        this.month='*';
        this.DoW='* ';
    }
    else{
        this.minute='0';
        this.hour='0';
        this.DoM='1';
        this.DoW='1';
        this.month='1';

    }
}

All values are already tracked. And the function that are not mentioned here for handling changes also work. The only I am having is with these functions but i can't detect where i did the error.

Edit: The page is functioning normally but when i select anything from the combobox for example – code, weekly or monthly – I get an alert that says error and with a text field to explain how i got the error

Best Answer

if condition should be a comparison.

this.template.querySelector('timing').value==="weekly"
this.template.querySelector('timing').value==="monthly"

It should be === instead of=.
Note: = is for assignment, == is for comparison without datatype comparison ("89"==89) and === is for comparison with datatype comparison("89"!=89).

Important: Install extensions for LWC in vs-code (eslint, lwc-extensions etc). With these extensions you would have known about this problem immediately.

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