Prevent Knockout validation code to execute on load

[Ankush Brahmbhatt]

Hello,

 

I have implemented a very basic required validation on "first name" largely based on the example suggested on knockout website (http://knockoutjs.com/documentation/extenders.html) - Live example 2: Adding validation to an observable.

 

My problem is that I don't want the validation to fire when the form is first loaded.

 

You will see the demo of issue I am facing at this link  http://jsfiddle.net/tCP62/22/

 

Please can anyone help me resolve this.

 

Regards,

Ankush

[Ankush Brahmbhatt]

Please Note that the JSFiddle link that i have provided to demo showing the problem - works in "Chrome" and does not work in IE. 

[Baz]

If I comment out the initial validation "validate(target());" in your fiddle is seems to work as expected.

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[Ankush Brahmbhatt]

Hello, Many thanks for your reply.

 

Yes. That worked. I was not able to see the problem in the grand scheme of things where I was implementing similar thing for my project.

 

This was immensely helpful. Thank you very much.

 

Regards,

Ankush

[Ankush Brahmbhatt]

Now I have another problem. I want to invoke the validation on save button click so that controls that have error get highlighted. Based on the above, I could invoke "validate" before save and check for "hasError" property. However what if I have two validations on "firstName" - say "required" as well as that firstName should start with "A" for which there is another extender. In this scenario, do I have to name the validate method differently on each extender and invoke all the validate methods for each observable that needs to be validated? Any help is very much appreciated

[Baz]

Complex validation is interesting, and requires a more sophisticated architecture than simple validation. You have to keep track of multiple possible errors (not just one hasError) and things like that. You should take a look at this project for ideas or to use it: https://github.com/Knockout-Contrib/Knockout-Validation

[Ankush Brahmbhatt]

Thank you. I will have a look at the validation plugin.