Uncaught TypeError: 'set' on proxy: trap returned falsish for property NameHow to convey LWC's complex Reactive property back to markup?How to set a public reactive property in the declared component during component constructionProperty “selectedContact” of [object:vm undefined > (51)] is set to a non-trackable objectHow to set default value for a select in lwc
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Uncaught TypeError: 'set' on proxy: trap returned falsish for property Name
How to convey LWC's complex Reactive property back to markup?How to set a public reactive property in the declared component during component constructionProperty “selectedContact” of [object:vm undefined > (51)] is set to a non-trackable objectHow to set default value for a select in lwc
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
Am not doing anything fancy, just trying to update a field on Contact in JS of LWC but getting this exception.
Uncaught TypeError: 'set' on proxy: trap returned falsish for property 'Name'
throws at mydomain/auraFW/javascript/mhontaYdOya4Y_lBu7v9yg/aura_prod.js:2:27687
HTML Code:
<template>
<template if:true=wiredContact>
wiredContact.Name
<lightning-input value=wiredContact.Name onchange=updateName></lightning-input>
</template>
</template>
JS:
import LightningElement ,wire,track,api from 'lwc';
import myContact from "@salesforce/apex/ContactController.fetchContact";
export default class Myrefreshapextest extends LightningElement
@track wiredContact;
@wire (myContact)
fetchedContact(error, data)
if(data)
console.log(JSON.stringify(data));
this.wiredContact = data;
else if (error)
console.log(error);
updateName (event)
console.log(JSON.stringify(event.detail.value));
console.log(JSON.stringify(this.wiredContact));
this.wiredContact.Name = event.detail.value;
Apex:
public class ContactController
@AuraEnabled(cacheable=true)
public static Contact fetchContact()
return [SELECT Id,Name FROM COntact LIMIT 1];
On top of my head, am not doing anything wrong, anyone has idea what's wrong with my code?
When I print console.log(JSON.stringify(this.wiredContact)); I get old values so am pretty sure it exists.
I tried with @track and @api, but same response. Can anyone shed some light?
lightning-web-components
asked 9 hours ago
Pranay JaiswalPranay Jaiswal
18.6k53158
|
show 1 more comment
Am not doing anything fancy, just trying to update a field on Contact in JS of LWC but getting this exception.
Uncaught TypeError: 'set' on proxy: trap returned falsish for property 'Name'
throws at mydomain/auraFW/javascript/mhontaYdOya4Y_lBu7v9yg/aura_prod.js:2:27687
HTML Code:
<template>
<template if:true=wiredContact>
wiredContact.Name
<lightning-input value=wiredContact.Name onchange=updateName></lightning-input>
</template>
</template>
JS:
import LightningElement ,wire,track,api from 'lwc';
import myContact from "@salesforce/apex/ContactController.fetchContact";
export default class Myrefreshapextest extends LightningElement
@track wiredContact;
@wire (myContact)
fetchedContact(error, data)
if(data)
console.log(JSON.stringify(data));
this.wiredContact = data;
else if (error)
console.log(error);
updateName (event)
console.log(JSON.stringify(event.detail.value));
console.log(JSON.stringify(this.wiredContact));
this.wiredContact.Name = event.detail.value;
Apex:
public class ContactController
@AuraEnabled(cacheable=true)
public static Contact fetchContact()
return [SELECT Id,Name FROM COntact LIMIT 1];
On top of my head, am not doing anything wrong, anyone has idea what's wrong with my code?
When I print console.log(JSON.stringify(this.wiredContact)); I get old values so am pretty sure it exists.
I tried with @track and @api, but same response. Can anyone shed some light?
lightning-web-components
asked 9 hours ago
Pranay JaiswalPranay Jaiswal
18.6k53158
Do you get same issue when you use the individual field names viz.,FirstName?
– Jayant Das
9 hours ago
Same errorUncaught TypeError: 'set' on proxy: trap returned falsish for property 'FirstName' throws atits same error doesnt matter if its normal contact or personAccountContact.
– Pranay Jaiswal
9 hours ago
I got the error (not exactly the same) but was able to replicate. Seems like you cannot set a value directly to the property instead recreate the JSON and then assign. E.g.,this.wiredContact = ["Name:" + event.detail.value];this worked. Still trying to figure out.
– Jayant Das
9 hours ago
@JayantDas It's a design feature. One that I'm pretty sure isn't documented.
– sfdcfox
9 hours ago
@sfdcfox I just saw the behavior you mentioned just by trying it out, and it worked, even though my format above is not JSON, but I was intending that.
– Jayant Das
9 hours ago
|
show 1 more comment
Am not doing anything fancy, just trying to update a field on Contact in JS of LWC but getting this exception.
Uncaught TypeError: 'set' on proxy: trap returned falsish for property 'Name'
throws at mydomain/auraFW/javascript/mhontaYdOya4Y_lBu7v9yg/aura_prod.js:2:27687
HTML Code:
<template>
<template if:true=wiredContact>
wiredContact.Name
<lightning-input value=wiredContact.Name onchange=updateName></lightning-input>
</template>
</template>
JS:
import LightningElement ,wire,track,api from 'lwc';
import myContact from "@salesforce/apex/ContactController.fetchContact";
export default class Myrefreshapextest extends LightningElement
@track wiredContact;
@wire (myContact)
fetchedContact(error, data)
if(data)
console.log(JSON.stringify(data));
this.wiredContact = data;
else if (error)
console.log(error);
updateName (event)
console.log(JSON.stringify(event.detail.value));
console.log(JSON.stringify(this.wiredContact));
this.wiredContact.Name = event.detail.value;
Apex:
public class ContactController
@AuraEnabled(cacheable=true)
public static Contact fetchContact()
return [SELECT Id,Name FROM COntact LIMIT 1];
On top of my head, am not doing anything wrong, anyone has idea what's wrong with my code?
When I print console.log(JSON.stringify(this.wiredContact)); I get old values so am pretty sure it exists.
I tried with @track and @api, but same response. Can anyone shed some light?
lightning-web-components
asked 9 hours ago
Pranay JaiswalPranay Jaiswal
18.6k53158
Am not doing anything fancy, just trying to update a field on Contact in JS of LWC but getting this exception.
Uncaught TypeError: 'set' on proxy: trap returned falsish for property 'Name'
throws at mydomain/auraFW/javascript/mhontaYdOya4Y_lBu7v9yg/aura_prod.js:2:27687
HTML Code:
<template>
<template if:true=wiredContact>
wiredContact.Name
<lightning-input value=wiredContact.Name onchange=updateName></lightning-input>
</template>
</template>
JS:
import LightningElement ,wire,track,api from 'lwc';
import myContact from "@salesforce/apex/ContactController.fetchContact";
export default class Myrefreshapextest extends LightningElement
@track wiredContact;
@wire (myContact)
fetchedContact(error, data)
if(data)
console.log(JSON.stringify(data));
this.wiredContact = data;
else if (error)
console.log(error);
updateName (event)
console.log(JSON.stringify(event.detail.value));
console.log(JSON.stringify(this.wiredContact));
this.wiredContact.Name = event.detail.value;
Apex:
public class ContactController
@AuraEnabled(cacheable=true)
public static Contact fetchContact()
return [SELECT Id,Name FROM COntact LIMIT 1];
On top of my head, am not doing anything wrong, anyone has idea what's wrong with my code?
When I print console.log(JSON.stringify(this.wiredContact)); I get old values so am pretty sure it exists.
I tried with @track and @api, but same response. Can anyone shed some light?
lightning-web-components
lightning-web-components
asked 9 hours ago
Pranay JaiswalPranay Jaiswal
18.6k53158
asked 9 hours ago
Pranay JaiswalPranay Jaiswal
18.6k53158
asked 9 hours ago
Pranay JaiswalPranay Jaiswal
18.6k53158
asked 9 hours ago
Pranay JaiswalPranay Jaiswal
18.6k53158
asked 9 hours ago
Pranay JaiswalPranay Jaiswal
18.6k53158
18.6k53158
Do you get same issue when you use the individual field names viz.,FirstName?
– Jayant Das
9 hours ago
Same errorUncaught TypeError: 'set' on proxy: trap returned falsish for property 'FirstName' throws atits same error doesnt matter if its normal contact or personAccountContact.
– Pranay Jaiswal
9 hours ago
I got the error (not exactly the same) but was able to replicate. Seems like you cannot set a value directly to the property instead recreate the JSON and then assign. E.g.,this.wiredContact = ["Name:" + event.detail.value];this worked. Still trying to figure out.
– Jayant Das
9 hours ago
@JayantDas It's a design feature. One that I'm pretty sure isn't documented.
– sfdcfox
9 hours ago
@sfdcfox I just saw the behavior you mentioned just by trying it out, and it worked, even though my format above is not JSON, but I was intending that.
– Jayant Das
9 hours ago
|
show 1 more comment
Do you get same issue when you use the individual field names viz.,FirstName?
– Jayant Das
9 hours ago
Same errorUncaught TypeError: 'set' on proxy: trap returned falsish for property 'FirstName' throws atits same error doesnt matter if its normal contact or personAccountContact.
– Pranay Jaiswal
9 hours ago
I got the error (not exactly the same) but was able to replicate. Seems like you cannot set a value directly to the property instead recreate the JSON and then assign. E.g.,this.wiredContact = ["Name:" + event.detail.value];this worked. Still trying to figure out.
– Jayant Das
9 hours ago
@JayantDas It's a design feature. One that I'm pretty sure isn't documented.
– sfdcfox
9 hours ago
@sfdcfox I just saw the behavior you mentioned just by trying it out, and it worked, even though my format above is not JSON, but I was intending that.
– Jayant Das
9 hours ago
Do you get same issue when you use the individual field names viz.,
FirstName?– Jayant Das
9 hours ago
Do you get same issue when you use the individual field names viz.,
FirstName?– Jayant Das
9 hours ago
Same error
Uncaught TypeError: 'set' on proxy: trap returned falsish for property 'FirstName' throws at its same error doesnt matter if its normal contact or personAccountContact.– Pranay Jaiswal
9 hours ago
Same error
Uncaught TypeError: 'set' on proxy: trap returned falsish for property 'FirstName' throws at its same error doesnt matter if its normal contact or personAccountContact.– Pranay Jaiswal
9 hours ago
I got the error (not exactly the same) but was able to replicate. Seems like you cannot set a value directly to the property instead recreate the JSON and then assign. E.g.,
this.wiredContact = ["Name:" + event.detail.value]; this worked. Still trying to figure out.– Jayant Das
9 hours ago
I got the error (not exactly the same) but was able to replicate. Seems like you cannot set a value directly to the property instead recreate the JSON and then assign. E.g.,
this.wiredContact = ["Name:" + event.detail.value]; this worked. Still trying to figure out.– Jayant Das
9 hours ago
@JayantDas It's a design feature. One that I'm pretty sure isn't documented.
– sfdcfox
9 hours ago
@JayantDas It's a design feature. One that I'm pretty sure isn't documented.
– sfdcfox
9 hours ago
@sfdcfox I just saw the behavior you mentioned just by trying it out, and it worked, even though my format above is not JSON, but I was intending that.
– Jayant Das
9 hours ago
@sfdcfox I just saw the behavior you mentioned just by trying it out, and it worked, even though my format above is not JSON, but I was intending that.
– Jayant Das
9 hours ago
|
show 1 more comment
2 Answers
2
active
oldest
votes
Cached items are set as read-only (because otherwise you could corrupt the cache). If you want a modifiable object, you need to clone it.
this.wiredContact = Object.assign(, data);
answered 9 hours ago
sfdcfoxsfdcfox
263k12209456
+1 forObject.assign(). Didn't know something like this existed.
– Jayant Das
7 hours ago
Thanks sfdcfox. You are truly a Javascript wizard.
– Pranay Jaiswal
7 hours ago
@JayantDas In ES6, the syntactic sugar is:this.wiredContact = ...data;
– tsalb
2 hours ago
@tsalb Thanks for sharing. I now recollect coming it across on one of Pranay’s another question
– Jayant Das
2 hours ago
add a comment |
This is what I could find from the documentation for wired service and that seems to be the case here (emphasis mine).
The wire service provisions an immutable stream of data to the component
So it most likely seems that when trying to set the values directly using this.wiredContact.Name, because of it's read only property, the values are not getting set.
However if you try to create a new data and then assign it to this.wiredContact, it works:
this.wiredContact = "Name:" + event.detail.value + "";
answered 8 hours ago
Jayant DasJayant Das
18k21330
This solution presumes only one field. If you have multiple fields, you must remember to encode all of them or lose data. The solution I presented avoids this problem by copying everything on initialization, leaving the variable free to be modified in all other function calls.
– sfdcfox
7 hours ago
Yeah, this was a more direct answer to the problem that Pranay had mentioned. I am not really good at JS, so didn't even know how to do so unless you mentioned.
– Jayant Das
7 hours ago
+1 thanks for linking documentation. This was freaking me out.
– Pranay Jaiswal
7 hours ago
1
I started looking only when @sfdcfox mentioned it was possibly not :) But at least it is mentioned. Easy to miss!
– Jayant Das
7 hours ago
add a comment |
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2 Answers
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2 Answers
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oldest
votes
Cached items are set as read-only (because otherwise you could corrupt the cache). If you want a modifiable object, you need to clone it.
this.wiredContact = Object.assign(, data);
answered 9 hours ago
sfdcfoxsfdcfox
263k12209456
+1 forObject.assign(). Didn't know something like this existed.
– Jayant Das
7 hours ago
Thanks sfdcfox. You are truly a Javascript wizard.
– Pranay Jaiswal
7 hours ago
@JayantDas In ES6, the syntactic sugar is:this.wiredContact = ...data;
– tsalb
2 hours ago
@tsalb Thanks for sharing. I now recollect coming it across on one of Pranay’s another question
– Jayant Das
2 hours ago
add a comment |
Cached items are set as read-only (because otherwise you could corrupt the cache). If you want a modifiable object, you need to clone it.
this.wiredContact = Object.assign(, data);
answered 9 hours ago
sfdcfoxsfdcfox
263k12209456
+1 forObject.assign(). Didn't know something like this existed.
– Jayant Das
7 hours ago
Thanks sfdcfox. You are truly a Javascript wizard.
– Pranay Jaiswal
7 hours ago
@JayantDas In ES6, the syntactic sugar is:this.wiredContact = ...data;
– tsalb
2 hours ago
@tsalb Thanks for sharing. I now recollect coming it across on one of Pranay’s another question
– Jayant Das
2 hours ago
add a comment |
Cached items are set as read-only (because otherwise you could corrupt the cache). If you want a modifiable object, you need to clone it.
this.wiredContact = Object.assign(, data);
answered 9 hours ago
sfdcfoxsfdcfox
263k12209456
Cached items are set as read-only (because otherwise you could corrupt the cache). If you want a modifiable object, you need to clone it.
this.wiredContact = Object.assign(, data);
answered 9 hours ago
sfdcfoxsfdcfox
263k12209456
answered 9 hours ago
sfdcfoxsfdcfox
263k12209456
answered 9 hours ago
sfdcfoxsfdcfox
263k12209456
answered 9 hours ago
sfdcfoxsfdcfox
263k12209456
263k12209456
+1 forObject.assign(). Didn't know something like this existed.
– Jayant Das
7 hours ago
Thanks sfdcfox. You are truly a Javascript wizard.
– Pranay Jaiswal
7 hours ago
@JayantDas In ES6, the syntactic sugar is:this.wiredContact = ...data;
– tsalb
2 hours ago
@tsalb Thanks for sharing. I now recollect coming it across on one of Pranay’s another question
– Jayant Das
2 hours ago
add a comment |
+1 forObject.assign(). Didn't know something like this existed.
– Jayant Das
7 hours ago
Thanks sfdcfox. You are truly a Javascript wizard.
– Pranay Jaiswal
7 hours ago
@JayantDas In ES6, the syntactic sugar is:this.wiredContact = ...data;
– tsalb
2 hours ago
@tsalb Thanks for sharing. I now recollect coming it across on one of Pranay’s another question
– Jayant Das
2 hours ago
+1 for
Object.assign(). Didn't know something like this existed.– Jayant Das
7 hours ago
+1 for
Object.assign(). Didn't know something like this existed.– Jayant Das
7 hours ago
Thanks sfdcfox. You are truly a Javascript wizard.
– Pranay Jaiswal
7 hours ago
Thanks sfdcfox. You are truly a Javascript wizard.
– Pranay Jaiswal
7 hours ago
@JayantDas In ES6, the syntactic sugar is:
this.wiredContact = ...data;– tsalb
2 hours ago
@JayantDas In ES6, the syntactic sugar is:
this.wiredContact = ...data;– tsalb
2 hours ago
@tsalb Thanks for sharing. I now recollect coming it across on one of Pranay’s another question
– Jayant Das
2 hours ago
@tsalb Thanks for sharing. I now recollect coming it across on one of Pranay’s another question
– Jayant Das
2 hours ago
add a comment |
This is what I could find from the documentation for wired service and that seems to be the case here (emphasis mine).
The wire service provisions an immutable stream of data to the component
So it most likely seems that when trying to set the values directly using this.wiredContact.Name, because of it's read only property, the values are not getting set.
However if you try to create a new data and then assign it to this.wiredContact, it works:
this.wiredContact = "Name:" + event.detail.value + "";
answered 8 hours ago
Jayant DasJayant Das
18k21330
This solution presumes only one field. If you have multiple fields, you must remember to encode all of them or lose data. The solution I presented avoids this problem by copying everything on initialization, leaving the variable free to be modified in all other function calls.
– sfdcfox
7 hours ago
Yeah, this was a more direct answer to the problem that Pranay had mentioned. I am not really good at JS, so didn't even know how to do so unless you mentioned.
– Jayant Das
7 hours ago
+1 thanks for linking documentation. This was freaking me out.
– Pranay Jaiswal
7 hours ago
1
I started looking only when @sfdcfox mentioned it was possibly not :) But at least it is mentioned. Easy to miss!
– Jayant Das
7 hours ago
add a comment |
This is what I could find from the documentation for wired service and that seems to be the case here (emphasis mine).
The wire service provisions an immutable stream of data to the component
So it most likely seems that when trying to set the values directly using this.wiredContact.Name, because of it's read only property, the values are not getting set.
However if you try to create a new data and then assign it to this.wiredContact, it works:
this.wiredContact = "Name:" + event.detail.value + "";
answered 8 hours ago
Jayant DasJayant Das
18k21330
This solution presumes only one field. If you have multiple fields, you must remember to encode all of them or lose data. The solution I presented avoids this problem by copying everything on initialization, leaving the variable free to be modified in all other function calls.
– sfdcfox
7 hours ago
Yeah, this was a more direct answer to the problem that Pranay had mentioned. I am not really good at JS, so didn't even know how to do so unless you mentioned.
– Jayant Das
7 hours ago
+1 thanks for linking documentation. This was freaking me out.
– Pranay Jaiswal
7 hours ago
1
I started looking only when @sfdcfox mentioned it was possibly not :) But at least it is mentioned. Easy to miss!
– Jayant Das
7 hours ago
add a comment |
This is what I could find from the documentation for wired service and that seems to be the case here (emphasis mine).
The wire service provisions an immutable stream of data to the component
So it most likely seems that when trying to set the values directly using this.wiredContact.Name, because of it's read only property, the values are not getting set.
However if you try to create a new data and then assign it to this.wiredContact, it works:
this.wiredContact = "Name:" + event.detail.value + "";
answered 8 hours ago
Jayant DasJayant Das
18k21330
This is what I could find from the documentation for wired service and that seems to be the case here (emphasis mine).
The wire service provisions an immutable stream of data to the component
So it most likely seems that when trying to set the values directly using this.wiredContact.Name, because of it's read only property, the values are not getting set.
However if you try to create a new data and then assign it to this.wiredContact, it works:
this.wiredContact = "Name:" + event.detail.value + "";
answered 8 hours ago
Jayant DasJayant Das
18k21330
answered 8 hours ago
Jayant DasJayant Das
18k21330
answered 8 hours ago
Jayant DasJayant Das
18k21330
answered 8 hours ago
Jayant DasJayant Das
18k21330
18k21330
This solution presumes only one field. If you have multiple fields, you must remember to encode all of them or lose data. The solution I presented avoids this problem by copying everything on initialization, leaving the variable free to be modified in all other function calls.
– sfdcfox
7 hours ago
Yeah, this was a more direct answer to the problem that Pranay had mentioned. I am not really good at JS, so didn't even know how to do so unless you mentioned.
– Jayant Das
7 hours ago
+1 thanks for linking documentation. This was freaking me out.
– Pranay Jaiswal
7 hours ago
1
I started looking only when @sfdcfox mentioned it was possibly not :) But at least it is mentioned. Easy to miss!
– Jayant Das
7 hours ago
add a comment |
This solution presumes only one field. If you have multiple fields, you must remember to encode all of them or lose data. The solution I presented avoids this problem by copying everything on initialization, leaving the variable free to be modified in all other function calls.
– sfdcfox
7 hours ago
Yeah, this was a more direct answer to the problem that Pranay had mentioned. I am not really good at JS, so didn't even know how to do so unless you mentioned.
– Jayant Das
7 hours ago
+1 thanks for linking documentation. This was freaking me out.
– Pranay Jaiswal
7 hours ago
1
I started looking only when @sfdcfox mentioned it was possibly not :) But at least it is mentioned. Easy to miss!
– Jayant Das
7 hours ago
This solution presumes only one field. If you have multiple fields, you must remember to encode all of them or lose data. The solution I presented avoids this problem by copying everything on initialization, leaving the variable free to be modified in all other function calls.
– sfdcfox
7 hours ago
This solution presumes only one field. If you have multiple fields, you must remember to encode all of them or lose data. The solution I presented avoids this problem by copying everything on initialization, leaving the variable free to be modified in all other function calls.
– sfdcfox
7 hours ago
Yeah, this was a more direct answer to the problem that Pranay had mentioned. I am not really good at JS, so didn't even know how to do so unless you mentioned.
– Jayant Das
7 hours ago
Yeah, this was a more direct answer to the problem that Pranay had mentioned. I am not really good at JS, so didn't even know how to do so unless you mentioned.
– Jayant Das
7 hours ago
+1 thanks for linking documentation. This was freaking me out.
– Pranay Jaiswal
7 hours ago
+1 thanks for linking documentation. This was freaking me out.
– Pranay Jaiswal
7 hours ago
1
1
I started looking only when @sfdcfox mentioned it was possibly not :) But at least it is mentioned. Easy to miss!
– Jayant Das
7 hours ago
I started looking only when @sfdcfox mentioned it was possibly not :) But at least it is mentioned. Easy to miss!
– Jayant Das
7 hours ago
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Do you get same issue when you use the individual field names viz.,
FirstName?– Jayant Das
9 hours ago
Same error
Uncaught TypeError: 'set' on proxy: trap returned falsish for property 'FirstName' throws atits same error doesnt matter if its normal contact or personAccountContact.– Pranay Jaiswal
9 hours ago
I got the error (not exactly the same) but was able to replicate. Seems like you cannot set a value directly to the property instead recreate the JSON and then assign. E.g.,
this.wiredContact = ["Name:" + event.detail.value];this worked. Still trying to figure out.– Jayant Das
9 hours ago
@JayantDas It's a design feature. One that I'm pretty sure isn't documented.
– sfdcfox
9 hours ago
@sfdcfox I just saw the behavior you mentioned just by trying it out, and it worked, even though my format above is not JSON, but I was intending that.
– Jayant Das
9 hours ago