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Øyvind Borgersen 10 Lightning component warning message
Hi,
I need to display a warning or error message on lightning page based on various logic from an apex class. This should be updated dynamically based on the different logic.
F.ex the apex class runs a check on a custom email field on the case record to check if the email exist in a contact related to the account. If it exist but no portal user is created for that account we should display a warning message as a lightning component. If custom email address does not match any contacts then there should be an error message.
How can we setup a dynamically error/warning message for this?
I need to display a warning or error message on lightning page based on various logic from an apex class. This should be updated dynamically based on the different logic.
F.ex the apex class runs a check on a custom email field on the case record to check if the email exist in a contact related to the account. If it exist but no portal user is created for that account we should display a warning message as a lightning component. If custom email address does not match any contacts then there should be an error message.
How can we setup a dynamically error/warning message for this?
public class apexController {
@AuraEnabled public static Boolean isEmailExist(String customEmail){
List<Contact> con = [Select Id From Contact where email =:customEmail];
if(con.size()>0)
return true;
else
return false
return null;
}
}
and Js Controller
CheckEmail : function(component, event, helper) {
var action = component.get('c.isEmailExist');
action.setParams({
"customEmail" : component.get('v.Email');
});
action.setCallback(this, function(a){
var state = a.getState(); // get the response state
if(state == 'SUCCESS') {
component.set('v.boolean', a.getReturnValue());
}
});
$A.enqueueAction(action);
}
All Answers
hello
For this you use
<aura:attribute name="boolean" type="boolean" default="false"/>
<aura:if isTrue="{!v.boolean}">
<!-- everything in here is rendered if boolean is true -->
</aura:if>
How would the controller code be based on this?
public class apexController {
@AuraEnabled public static Boolean isEmailExist(String customEmail){
List<Contact> con = [Select Id From Contact where email =:customEmail];
if(con.size()>0)
return true;
else
return false
return null;
}
}
and Js Controller
CheckEmail : function(component, event, helper) {
var action = component.get('c.isEmailExist');
action.setParams({
"customEmail" : component.get('v.Email');
});
action.setCallback(this, function(a){
var state = a.getState(); // get the response state
if(state == 'SUCCESS') {
component.set('v.boolean', a.getReturnValue());
}
});
$A.enqueueAction(action);
}
Whenever we are using any logic at the server side, we need to catch errors properly and display them on screen. To achieve this –
Wrap the code in a try-catch block.
Throw an AuraHandledException in the catch block, it will display proper error at component level.
Example: Avoid writing code without exception handling like below snippet
public with sharing class ApexController {
// Method for error
@AuraEnabled
public static void showError() {
integer divideByZero = 1 / 0;
}
}
public with sharing class ApexController {
// Method for error
@AuraEnabled
public static void showError() {
try {
integer divideByZero = 1 / 0;
} catch (Exception e) {
throw new AuraHandledException(e.getMessage());
}
}
}
Client-side errors:
In Lightening JavaScript, we must handle unrecoverable and recoverable app errors.
An unrecoverable exception is mostly runtime exception like Null Pointer Exception. They are usually the result of some missed checks in the program code.
A recoverable exception is something that you know beforehand can happen and take certain measures.
To handle these errors, use try-catch and a component such as ui:message to tell users about the problem. Example: This example shows how unrecoverable error prevents your app from executing successfully.
<!–c: unrecoverableError –>
<aura:component >
<lightning:button label=”throw error” onclick=”{!c.throwError}”/>
</aura:component>
/*unrecoverableErrorController.js*/
({
throwError : function(component, event){
throw new Error(“Hi Tej Pal, this is Unrecoverable Error”);
}
})
<!–c:recoverableError–>
<aura:component >
<div aura:id=”div1?></div>
<lightning:button label=”Throw an Error” onclick=”{!c.throwErrorForKicks}”/>
</aura:component>
/*recoverableErrorController.js*/
({
throwErrorForKicks: function(cmp) {
// this sample always throws an error to demo try/catch
var hasPerm = false;
try {
if (!hasPerm) {
throw new Error(“You don’t have permission to edit this record.”);
}
}
catch (e) {
$A.createComponents([
[“ui:message”,{
“title” : “Sample Thrown Error”,
“severity” : “error”,
}],
[“ui:outputText”,{
“value” : e.message
}]
],
function(components, status, errorMessage){
if (status === “SUCCESS”) {
var message = components[0];
var outputText = components[1];
// set the body of the ui:message to be the ui:outputText
message.set(“v.body”, outputText);
var div1 = cmp.find(“div1”);
// Replace div body with the dynamic component
div1.set(“v.body”, message);
}else if (status === “INCOMPLETE” || status === “ERROR”) {
console.log(“Error: ” + errorMessage);
}
}
);
}
}
})
Please refer to the following link as it may be helpful in solving your issue:
https://salesforce.stackexchange.com/questions/247721/display-apex-error-message-in-lightning-component
I hope you find the above solution helpful. If it does, please mark as Best Answer to help others too.
Thanks and Regards,
Deepali Kulshrestha