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    Home»Salesforce»Stop deselecting lightning-dual-listbox list

    Stop deselecting lightning-dual-listbox list

    Dhanik Lal SahniBy Dhanik Lal SahniOctober 28, 2020No Comments1 Min Read
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    Stop deselecting lightning-dual-listbox list
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    lightning-dual-listbox is used to show two side-by-side listboxes. This component can be used to show list of available options and selected options.

    Recently my team got requirement where selected options should not be removed but we can select new options. Ex.. If user already selected Option1, Option2 then they should not remove these options but they add and remove other options like option3, option4.

    Let us see how we can accomplish this in lightning web component.

    We can use onchange event to set default values if those values are de-selected. value property will show selected values. We will set this property with default selected values.

    Here is code which show toast message that you can deselect those values and then set it default selected values.

    handleChange(event)
        {
            var selectedRows=event.detail.value;
            if(this.defaultValues!=undefined && this.defaultValues!=null && this.defaultValues.length>0)
            {
                    var items=this.defaultValues.filter(value => selectedRows.includes(value));
                    if(this.defaultValues.length!==items.length)
                    {
                        this.showMessage('Notification','Existing selected value(s) can not be removed','error');
                        this.defaultValues=[...this.defaultValues];
                        event.preventDefault();
                        return;
                    }
            }
            
        }

    Complete Code:

    Test Page:

    dual-listbox lightning Lightning web component lightning-dual-listbox lIn business cases lwc salesforce
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    Dhanik Lal Sahni
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    With over 18 years of experience in web-based application development, I specialize in Salesforce technology and its ecosystem. My journey has equipped me with expertise in a diverse range of technologies including .NET, .NET Core, MS Dynamics CRM, Azure, Oracle, and SQL Server. I am dedicated to staying at the forefront of technological advancements and continuously researching new developments in the Salesforce realm. My focus remains on leveraging technology to create innovative solutions that drive business success.

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