How to Notify User about Unsaved Changes on the UI using Lightning Component

In this blog, we will discuss on how to notify the user about unsaved changes on the UI by using Lightning:unsavedChanges component.

Lightning:unsavedChanges

For example, this component provides a way to notify the user about unsaved changes on the UI and to participate in saving or discarding those changes based on the user’s decision.
Let’s take an example; if you are entering any data and during that period you accidentally click on any other link which redirects you to another page. As a result, during the redirection the entered data might be lost.
So using the “Lightning:unsavedChanges” component whenever you click on any other link you will be notified using a popup about the unsaved changes and you will get options to continue, save and discard the changes.
To clarify, the process is handled by “setUnsavedChanges” method. This method is present in the “Lightning:unsavedChanges” component. This method has two arguments:
- A Boolean argument that indicates unsaved data is present or not. It returns true if unsaved data present, otherwise false.
- An optional object argument.

Create Lightning Component

SampleComponent

For example, in this Lightning component, we are creating an instance of “Lightning:unsavedChanges" component to access its “setUnsavedChanges” method and assign an aura:id attribute to it. Refer to the below code to define the component.

<aura:component>
    <aura:attribute name="firstname" type="String" />
    <aura:attribute name="lastname" type="String" />
    <aura:handler name="change" value="{!v.firstname}" action="{!c.valueChanged}"/>
    <aura:handler name="change" value="{!v.lastname}" action="{!c.valueChanged}"/>
    <lightning:unsavedChanges aura:id="unsaved"
                onsave="{!c.handleSave}"
                ondiscard="{!c. handleDiscard}" />

    <lightning:card variant="narrow" title="Unsaved Example">
        <div class="slds-p-around_medium">
            <lightning:input type="text" label="First Name" value="{!v.firstname}"  />
            <lightning:input type="text" label="Last Name" value="{!v.lastname}"/>
        </div>
        <div class="slds-p-around_medium">
            <lightning:button variant="brand" label="Save" title="Save" onclick="{! c.save }" />
        </div>
    </lightning:card>
</aura:component>

SampleComponentController

Whenever the user enters any data on First Name or Last Name field the “valueChanged” controller method gets invoked. If the user takes some action that would lose unsaved content such as closing its console tab container then a dialog appears prompting them to save or discard it.
The “handleSave” or “handleDiscard” method is called based on their selection. Refer the below code.

({  
 valueChanged : function(component, event, helper) 
    {
        var unsaved = component.find("unsaved");
        unsaved.setUnsavedChanges(true, { label: 'You have unsaved changes. Do you want to Continue?' });
    },
    handleSave: function(component, event, helper) {
        //method invoke when user click on save button
     },
     handleDiscard: function(component, event, helper) {
        //method invoke when user click on save discard button
     }
})

Here is the output, where we display a simple form page with First Name and Last Name field, so now whenever a user enters any value to this field and then clicks on another link or try to close the page, a popup will appear as shown in the below image.

User Notification for Unsaved Changes

As a result, user is now notified about unsaved changes on the page in a custom Lightning component.

We hope you may find this blog resourceful and helpful. If you still have concerns and need more help, please contact us at salesforce@greytrix.com.

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