Skip to main content

How to have Chaining Promises in Lighting Component ?

We may need to call multiple apex function from aura component, each function is dependent to other function. In that case we may have call promise function inside another.

Here is the sample code

@AuraEnabled
public static Opportunity getOpportunity(String opptyId){
        return [select id,name,stagename from Opportunity where id='opptyId']
 }

@AuraEnabled
public static Boolean checkFormAttached(String opptyId){
        Boolean isNotAttached = true;
        set<String> setOfNames = new set<String>
{'Admission Notification','EligibilitySummary','BAForm'};
        List<ContentDocumentLink> contLinks = [SELECT id,contentdocument.Title,
LinkedEntityId FROM ContentDocumentLink 
                                               WHERE LinkedEntityId =:opptyId 
                                               AND contentdocument.Title IN:setOfNames];
        return contLinks.size()>0;
 }

Java script controller
({ doInit : function(component, event, helper){
        
        let checkAttachment = helper.checkAttachment(component, event, helper, false);
        
checkAttachment.then(function(result){
            // if result is true then call function
            if(result){
                
                let getoppy = helper.getopportunity(component, event, helper, false);
                  
                getoppy.then((globalResults) => {
                }).catch((error) => {
                     
                let toast = {title: "Error", type: "error", message: "An error occurred while searching for matching residents."}; helper.showToast(toast); component.set("v.closeModal", true); return;
});
}
});
}
})

Helper class
({
checkAttachment : function(component, event, helper){
        console.log('checkAttachment called');
         let opptyId = component.get("v.recordId");
         console.log('opptyId ',opptyId);
        //check attachments
    let checkAttachments = helper.executeAction(component, "c.checkFormAttached", {"opptyId":opptyId});
return checkAttachments.then((results) =>{
             console.log('results 39',results);
             if(!results){
              helper.showToast({type: "error",
title: "Attachment Missing",
message: "Please attach at least one of the following – Admission Notification, BA Form, Eligibility Summary"});
component.set("v.closeModal", true);
component.set("v.isLoading", false);
return false;
            }else{
                console.log('results 46',results);
                return true;
            }
         });
        
    },
executeAction: function(component, actionName, params) { return new Promise(function(resolve, reject) { var action = component.get(actionName); action.setParams(params); action.setCallback(this, function(response) { if (component.isValid() && response.getState() === 'SUCCESS') { resolve(response.getReturnValue()); } else { reject(response.getError()[0]); } }); $A.enqueueAction(action); }); },
getResidents : function(component, event, helper){
         let getoppy= helper.executeAction(component, "c.getOpportunity", {"opptyId":opptyId});
return getoppy.then((results) => {
            if(results){
                return results;
}else{return null;}
});
}
})
Labels:

Comments

Post a Comment

Popular posts from this blog

How to Create a Tooltip in Lightning Datatable ?

Imagine you have a datatable displaying a list of Contact records , and one of the columns shows the Account Name . The Account Name is a hyperlink that allows users to navigate to the Account record page. But what if users want to take a quick glance at some key Account fields —like Phone or Address—without navigating to the Account record? In Salesforce Classic, this was achieved using the Mini Page Layout feature from standard page. However, in Lightning Experience, we can implement a similar feature by adding a tooltip to the data table. Solution Overview: We’ll create a Lightning Web Component (LWC) that: Displays a data table with a clickable Account Name . Provides a tooltip that shows the Account's Phone and Address fields when users hover over the Account Name. Implementation Steps: 1. Data Preparation We need to retrieve the following fields for each Contact and its associated Account: Contact Fields : Name, Phone, Email Account Fields : Name, Phone, Billing Addre...
Post a Comment
Read more

Lifecycle hooks in LWC

There are 3 phase of LWC component  1. Mounting  A. constructor, B. connnectedCallback C. render D. renderedCallback 2. UnMounting  A. disconnectedcallback 3. Error  A.errorcallback Note - render is not lifecycle hook, it is protected method of Lightning element class. Mounting Phase LWC Creation and Render Life cycle Constructor Method ·        This method called when component is instantiated and It flows from parent to child component. ·        Need to call Super() inside constructor method ·        Can’t access any component properties or child component because it’s not ready yet. ·        Host element can be accessed through “this. template” inside constructor method. ·        Don’t add any attributes to host inside constructor C   constructor (){          super (); //...
Post a Comment
Read more

Style in LWC

 Following are the ways we can apply in CSS in LWC. 1. Inline CCS Inline CSS is not recommended approaches, it is take highest priority among all CSS. style="color:green;font-size:10px;" is inline CSS added to div < template >     < lightning-card title = "Inline CSS" >         < div >             < div style = "color:green;font-size:10px;" > This is inline Style div </ div >         </ div >     </ lightning-card > </ template >  2. External CSS style can be applied to an elements such as h1, p,div span etc. It can applied to class using "." notation. for example .user{} It can also be applied to pseudo class.  for example .user:hover{} Id locator is not being used in LWC to apply style To apply external css, need to create separate CSS file, file name should be exactly matched with component name. for example - If component name is ...
Post a Comment
Read more