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Lightning Web Component - do I need to track changes for every single input field in a form

2

Since lwc is one-way data binding so if I need to get the current value of the input field I turned out to use event.target.value in the onchange event.

However, if we need to have a form of input fields and only need to collect all of the data at the form submission time, do I still need to add onchange event on every one of the input field at all? Or can I simply collect the information at the submission time?

lightning-web-components

share|improve this question

asked 1 hour ago

Lance ShiLance Shi

7,52633077

add a comment | 

2

Since lwc is one-way data binding so if I need to get the current value of the input field I turned out to use event.target.value in the onchange event.

However, if we need to have a form of input fields and only need to collect all of the data at the form submission time, do I still need to add onchange event on every one of the input field at all? Or can I simply collect the information at the submission time?

lightning-web-components

share|improve this question

asked 1 hour ago

Lance ShiLance Shi

7,52633077

add a comment | 

Since lwc is one-way data binding so if I need to get the current value of the input field I turned out to use event.target.value in the onchange event.

However, if we need to have a form of input fields and only need to collect all of the data at the form submission time, do I still need to add onchange event on every one of the input field at all? Or can I simply collect the information at the submission time?

lightning-web-components

share|improve this question

asked 1 hour ago

Lance ShiLance Shi

7,52633077

share|improve this question

asked 1 hour ago

Lance ShiLance Shi

7,52633077

share|improve this question

asked 1 hour ago

Lance ShiLance Shi

7,52633077

asked 1 hour ago

Lance ShiLance Shi

7,52633077

asked 1 hour ago

Lance ShiLance Shi

7,52633077

2 Answers
2

active

oldest

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2

In my opinion, this is more of how you want to implement and most importantly how would you want to interact with the Users filling in the form. Sometimes one over other is just what you need.

do I still need to add onchange event on every one of the input field at all?

Use this approach if you really want to alert the user about any error in the field right away instead of waiting for end.

Or can I simply collect the information at the submission time?

Use this approach if you want to defer the validation until the submission.

share|improve this answer

answered 57 mins ago

Jayant DasJayant Das

17k21330

add a comment | 

1

I would simply collect all the information on form submission using query selector.

this.template.querySelector('classname'); //use query selector

Note that @track should not be used extensively . It makes less sense to use this decorator if we are not rendering something on the UI .

If there is no client side validations involved on page, there is no need to use change handler on every input .

share|improve this answer

edited 31 mins ago

answered 39 mins ago

Mohith ShrivastavaMohith Shrivastava

61.5k7105147

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  So it is pretty much using the traditional jQuery style to get the values by either class or id, is that correct?
  
  – Lance Shi
  11 mins ago
  

  
  
  
  

add a comment | 

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2

In my opinion, this is more of how you want to implement and most importantly how would you want to interact with the Users filling in the form. Sometimes one over other is just what you need.

do I still need to add onchange event on every one of the input field at all?

Use this approach if you really want to alert the user about any error in the field right away instead of waiting for end.

Or can I simply collect the information at the submission time?

Use this approach if you want to defer the validation until the submission.

share|improve this answer

answered 57 mins ago

Jayant DasJayant Das

17k21330

add a comment | 

2

In my opinion, this is more of how you want to implement and most importantly how would you want to interact with the Users filling in the form. Sometimes one over other is just what you need.

do I still need to add onchange event on every one of the input field at all?

Use this approach if you really want to alert the user about any error in the field right away instead of waiting for end.

Or can I simply collect the information at the submission time?

Use this approach if you want to defer the validation until the submission.

share|improve this answer

answered 57 mins ago

Jayant DasJayant Das

17k21330

add a comment | 

In my opinion, this is more of how you want to implement and most importantly how would you want to interact with the Users filling in the form. Sometimes one over other is just what you need.

do I still need to add onchange event on every one of the input field at all?

Use this approach if you really want to alert the user about any error in the field right away instead of waiting for end.

Or can I simply collect the information at the submission time?

Use this approach if you want to defer the validation until the submission.

share|improve this answer

answered 57 mins ago

Jayant DasJayant Das

17k21330

share|improve this answer

answered 57 mins ago

Jayant DasJayant Das

17k21330

answered 57 mins ago

Jayant DasJayant Das

17k21330

answered 57 mins ago

Jayant DasJayant Das

17k21330

1

I would simply collect all the information on form submission using query selector.

this.template.querySelector('classname'); //use query selector

Note that @track should not be used extensively . It makes less sense to use this decorator if we are not rendering something on the UI .

If there is no client side validations involved on page, there is no need to use change handler on every input .

share|improve this answer

edited 31 mins ago

answered 39 mins ago

Mohith ShrivastavaMohith Shrivastava

61.5k7105147

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  So it is pretty much using the traditional jQuery style to get the values by either class or id, is that correct?
  
  – Lance Shi
  11 mins ago
  

  
  
  
  

add a comment | 

1

I would simply collect all the information on form submission using query selector.

this.template.querySelector('classname'); //use query selector

Note that @track should not be used extensively . It makes less sense to use this decorator if we are not rendering something on the UI .

If there is no client side validations involved on page, there is no need to use change handler on every input .

share|improve this answer

edited 31 mins ago

answered 39 mins ago

Mohith ShrivastavaMohith Shrivastava

61.5k7105147

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  So it is pretty much using the traditional jQuery style to get the values by either class or id, is that correct?
  
  – Lance Shi
  11 mins ago
  

  
  
  
  

add a comment | 

I would simply collect all the information on form submission using query selector.

this.template.querySelector('classname'); //use query selector

Note that @track should not be used extensively . It makes less sense to use this decorator if we are not rendering something on the UI .

If there is no client side validations involved on page, there is no need to use change handler on every input .

share|improve this answer

edited 31 mins ago

answered 39 mins ago

Mohith ShrivastavaMohith Shrivastava

61.5k7105147

this.template.querySelector('classname'); //use query selector

share|improve this answer

edited 31 mins ago

answered 39 mins ago

Mohith ShrivastavaMohith Shrivastava

61.5k7105147

answered 39 mins ago

Mohith ShrivastavaMohith Shrivastava

61.5k7105147

answered 39 mins ago

Mohith ShrivastavaMohith Shrivastava

61.5k7105147