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Bound boolean isn't set from true to false when radio button is unchecked #291

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sethladd opened this issue Sep 23, 2013 · 9 comments
Closed

Bound boolean isn't set from true to false when radio button is unchecked #291

sethladd opened this issue Sep 23, 2013 · 9 comments

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@sethladd
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Going from false to true sets the bound boolean, but going from true to false does not set the bound boolean back to false.

Here's the test:

<!DOCTYPE html>

<html>
  <head>
    <title>index</title>
    <script src="polymer.min.js"></script>
  </head>
  <body>

<polymer-element name="my-example">
  <template>
    <div>
      Your favorite color is:
      <div>
        <label for="red">Red <input name="color" type="radio" id="red" value="red" checked="{{red}}"></label>
      </div>
      <div>
        <label for="green">Green <input name="color" type="radio" id="green" value="green" checked="{{green}}"></label>
      </div>
      <div>
        <label for="blue">Blue <input name="color" type="radio" id="blue" value="blue" checked="{{blue}}"></label>
      </div>
    </div>
    <div>
      You selected {{favoriteColor}}
    </div>
  </template>
  <script>
  Polymer('my-example', {
    red: false,
    green: false,
    blue: false,
    get favoriteColor() {
        if (this.red) {
            return 'red';
        } else if (this.blue) {
            return 'blue';
        } else if (this.green) {
            return 'green';
        }
    }
  });
  </script>
</polymer-element>

<my-example></my-example>

</body>
</html>

/cc @ebidel
@sorvell
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sorvell commented Sep 23, 2013

+@rafaelw

@sorvell
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sorvell commented Sep 24, 2013

Functionality of input type radio came up before and led to us making an example that works with polymer-selector. It's available at the bottom of the example file here: https://github.com/Polymer/polymer-elements/blob/master/polymer-selector/index.html

@ebidel
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ebidel commented Sep 24, 2013

@sethladd and I also came up with http://jsbin.com/iXuSOCO/2/edit as a raw radio button solution.

@ghost ghost assigned rafaelw and ebidel Sep 25, 2013
@sethladd
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Thanks guys, those are good workarounds. I was hoping that this bug report is a fine-grained and distilled repro of what is possibly indicative of a bug.

Does HTML fire a changed event when a radio button goes from true to false? I'll need to investigate.

@sorvell
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sorvell commented Sep 25, 2013

Re: the change event, I don't think so.

I'll let @rafaelw weigh in on supporting this better in Node.bind.

On Sep 24, 2013, at 6:11 PM, Seth Ladd [email protected] wrote:

Thanks guys, those are good workarounds. I was hoping that this bug report
is a fine-grained and distilled repro of what is possibly indicative of a
bug.

Does HTML fire a changed event when a radio button goes from true to false?
I'll need to investigate.

—
Reply to this email directly or view it on
GitHubhttps://github.com//issues/291#issuecomment-25055626
.

@peterwmwong
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Some observations...

I think it's NodeBind.js getAssociatedRadioButtons() that prevents the radio button from being checked because:

  1. element.ownerDocument.contains(element)) returns false, cause element (the input) is in the Shadow DOM and the polyfill contains() isn't smart enough to look there... possible fix & test
  2. If # 1 was fixed and if the radio buttons were wrapped in a form, you'd blow up here because HTMLFormElement.elements does not wrap it's items... possible fix & test
  3. If # 1 was fixed and the radio buttons weren't wrapped in a form (just like the examples above), still broken cause ownerDocument.querySelectorAll() won't find the inputs in the ShadowDOM... Should it look inside the shadowRoot instead?

Hope this helps.

@sethladd
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Thanks Peter. Someone on the list brought up the getAssociatedRadioButtons diagnosis as well.

@rafaelw
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rafaelw commented Sep 25, 2013

Yup. getAssociatedRadioButtons needed to be tolerant of associated radio buttons within a ShadowRoot.

Fixed here: googlearchive/NodeBind@9978535

@rafaelw rafaelw closed this as completed Sep 25, 2013
@sethladd
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Very cool, thanks Raf!

@DartBot DartBot mentioned this issue Jun 3, 2015
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5 participants
@sethladd @sorvell @ebidel @peterwmwong @rafaelw