Add TagHelperSample.Web

[dougbu]

Add Tag Helper sample, #1242

[dougbu]

this file isn't much different from Edit.cshtml but I only use a user-specified HTML attributes (that helper would normally generate) here. suspect "class" attribute would be merged but all other user-specified HTML attributes would just win.

[dougbu]

/cc @yishaigalatzer @DamianEdwards @NTaylorMullen

[dougbu]

• at least initially, input tag helper will ignore the "format" bound attribute if "type" is checkbox, hidden, password, or radio.
• type="radio" (not in this sample) needs a value to compare to the expression and the "value" HTML attribute Just Works(tm). so under the covers, that may be the only case where MVC tag helpers use TagHelperContext.AllAttributes

[NTaylorMullen]

Should showcase <form> with one or more of its allowed attributes.

[NTaylorMullen]

Would be nice to see a _Layout with a few anchor tag helpers (to show they can be used there). They're perfect for navigation.

[NTaylorMullen]

I think at one point we discussed adding this as a parameter to <form>, something like:

<form addAntiForgeryToken="true">

I could just be misremembering though. /cc @DamianEdwards

[NTaylorMullen]

🐃

[dougbu]

since <label/> already has a "for" attribute, we should probably use another name for the <label/> / <input/> / <select/> / <textarea/> expression bound attribute. @DamianEdwards any suggestions?

[dougbu]

Should showcase

with one or more of its allowed attributes.

👌

Would be nice to see a _Layout with a few anchor tag helpers (to show they can be used there). They're perfect for navigation.

👎 already using <a/> and this sample doesn't need another file

🐃

what does the water buffalo mean?

[NTaylorMullen]

Buffalo is my version of ⌚ , trying to be a trend setter . I was thinking a _Layout would showcase that these things are useable in those pages but did not affect the resulting pages underneath it.

[dougbu]

Rebased and updated

@yishaigalatzer @Eilon @DamianEdwards please let @NTaylorMullen and I know if the sample and its comments misses anything from our meeting.

[dougbu]

"items" attribute needn't be so ugly. I just didn't switch from User to UserViewModel in this sample.

[NTaylorMullen]