1

00:00:01,430 --> 00:00:06,240

So this time around, we want to improve our validation and we want to do a few things, actually.



2

00:00:06,620 --> 00:00:07,900

So right now we have this.



3

00:00:07,910 --> 00:00:09,310

It displays an error message.



4

00:00:09,500 --> 00:00:13,350

It displays a nice red around it when there's a problem, and that works great.



5

00:00:13,790 --> 00:00:17,580

So we want to add that same kind of logic to all of these.



6

00:00:17,900 --> 00:00:24,740

We also want the form to repopulate with user entered information after an error is detected and the



7

00:00:24,740 --> 00:00:25,710

pages displayed.



8

00:00:25,720 --> 00:00:29,800

So we want the form to be partially filled out and show errors where errors take place.



9

00:00:30,140 --> 00:00:34,520

And we also want to simplify our method of checking for required fields.



10

00:00:34,850 --> 00:00:35,610

So let's get started.



11

00:00:35,840 --> 00:00:40,460

So I want to go back to my code and I'm going to, first of all, go to the Make Reservation page and



12

00:00:40,460 --> 00:00:45,730

I'm going to think about what how I can display information on this particular form.



13

00:00:46,340 --> 00:00:52,100

So this part of the form right here, which is the first name I want this to display, whatever the



14

00:00:52,100 --> 00:00:54,620

user entered, if they've entered information.



15

00:00:54,620 --> 00:00:57,260

But there's an error and I'm displaying this form.



16

00:00:57,500 --> 00:00:58,370

So how do I do that?



17

00:00:58,570 --> 00:00:59,780

Let's go back to our handlers.



18

00:01:00,710 --> 00:01:05,870

And you remember here, when I rendered the template, I actually pasted this data object.



19

00:01:05,870 --> 00:01:12,620

And the data object is a map of typed string interface, which means we can look up things by string



20

00:01:12,620 --> 00:01:14,240

and we can store anything we want in there.



21

00:01:14,510 --> 00:01:20,420

And we stored one value in that map reservation with the value of reservation, which is this, which



22

00:01:20,420 --> 00:01:23,960

is pre populated with the user's information, whatever they enter in the form.



23

00:01:24,650 --> 00:01:29,200

Well, we can do a similar thing up here when we're displaying the reservation page with a get request.



24

00:01:29,210 --> 00:01:30,710

So we first come to that page.



25

00:01:31,220 --> 00:01:41,950

We can actually create a variable called var empty reservation that's of type models, dot reservation.



26

00:01:42,530 --> 00:01:46,760

So that is an empty reservation, but it has all the necessary fields.



27

00:01:47,240 --> 00:01:58,070

So then we can just create another map so we can say data is equal to make map string interface and



28

00:01:58,070 --> 00:01:58,980

put a value in there.



29

00:01:59,030 --> 00:02:07,850

So data reservation and it's important that it has exactly the same name that I'm using down here when



30

00:02:07,850 --> 00:02:09,140

I say data reservation.



31

00:02:09,650 --> 00:02:18,120

So I create that and in that I store my empty reservation and then I just pass that as data.



32

00:02:20,660 --> 00:02:26,870

So now I have an empty reservation the very first time this page is displayed, which means that I can



33

00:02:26,870 --> 00:02:32,180

come in here and on this input I can use an attribute we haven't paid attention to so far, and it's



34

00:02:32,180 --> 00:02:32,840

called value.



35

00:02:32,870 --> 00:02:38,120

So what is the value to be displayed when this form is rendered and when that's going to be equal to



36

00:02:38,120 --> 00:02:39,000

my reservation?



37

00:02:39,980 --> 00:02:41,630

Now, how am I going to get the reservation out of that?



38

00:02:41,660 --> 00:02:47,300

Well, the simplest way to get the reservation out of my data pass to the template is to come up before



39

00:02:47,300 --> 00:02:50,240

I'm going to use it, but in the same block.



40

00:02:50,240 --> 00:02:54,000

So in the content block, I'm going to declare a new variable using a dollar sign.



41

00:02:54,140 --> 00:02:54,830

Kind of feels like.



42

00:02:55,280 --> 00:02:55,850

But it's not.



43

00:02:56,150 --> 00:02:57,380

And I'll just call this race.



44

00:02:57,560 --> 00:03:04,790

And that's going to be equal to I'm assigning of the value of index data, which is from my template



45

00:03:04,790 --> 00:03:05,180

data.



46

00:03:05,330 --> 00:03:07,310

And inside of that I have a reservation.



47

00:03:07,430 --> 00:03:13,280

So I'm storing the value of my empty reservation the first time this page is displayed in a variable



48

00:03:13,280 --> 00:03:14,450

called Sunrise.



49

00:03:14,900 --> 00:03:15,920

So I can copy that.



50

00:03:16,610 --> 00:03:23,720

Come down here and paste it right in here, put my double bass brackets around it or curly brackets



51

00:03:23,720 --> 00:03:26,900

or whatever you want to call them, rez dot first name.



52

00:03:27,750 --> 00:03:34,370

And I can just copy this and do it for all of the fields so I can come down here for last name and change



53

00:03:34,370 --> 00:03:36,410

value to Rez last name.



54

00:03:38,070 --> 00:03:39,260

Make sure there's a space there.



55

00:03:39,980 --> 00:03:41,320

Do the same thing here.



56

00:03:41,330 --> 00:03:42,830

And this one is for email.



57

00:03:42,830 --> 00:03:49,790

So it's red dot email and again case matters because it's actually named email with a capital E in the



58

00:03:50,150 --> 00:03:55,790

models, dot in the model and then phone resort.



59

00:03:56,080 --> 00:04:03,400

So now if I save that and start my application and start it up, does it compile as it does?



60

00:04:03,410 --> 00:04:05,720

So let's go back to our form, reload the page.



61

00:04:05,720 --> 00:04:10,790

So you know, it's a new page, a blank form, and this time I'll leave first name blank because that's



62

00:04:10,790 --> 00:04:12,500

the only required field I have right now.



63

00:04:12,530 --> 00:04:19,330

We're going to make that better in a minute and I'll put Smith John at not some dotcom doesn't matter.



64

00:04:19,330 --> 00:04:22,510

And some phone number five five five three three now.



65

00:04:22,520 --> 00:04:29,990

And I submit this these should be repopulated and they are I get an error message, but these are repopulate.



66

00:04:29,990 --> 00:04:33,140

So I need to fix this error, but I don't have to retype all this.



67

00:04:33,140 --> 00:04:34,010

And that's great.



68

00:04:34,020 --> 00:04:35,220

Now, how did that work?



69

00:04:36,320 --> 00:04:37,520

Well, let's go back to our handlers.



70

00:04:38,420 --> 00:04:43,970

So back to our handlers, which are right here and hide this and look at when it's rendering it the



71

00:04:43,970 --> 00:04:44,650

first time.



72

00:04:45,050 --> 00:04:50,510

So when our roots start right from the beginning, when I hit this page for the first time, make reservation,



73

00:04:50,510 --> 00:04:57,380

I'm going to the reservation handler, which creates an empty reservation, stores it in my data variable



74

00:04:57,590 --> 00:04:59,990

and passes that to the template along with.



75

00:05:00,070 --> 00:05:03,410

An empty form, so all of this is basically pristine.



76

00:05:03,430 --> 00:05:06,380

There is no useful data in there at all, and that's exactly what I want.



77

00:05:06,400 --> 00:05:09,860

The first time the pages rendered when they post the data.



78

00:05:10,000 --> 00:05:15,220

Now it's calling this handler make reservation post and it goes to post reservation.



79

00:05:15,340 --> 00:05:20,590

And that one says pass the form, create a reservation variable.



80

00:05:20,590 --> 00:05:25,120

That's a type models reservation and store, whatever they entered in there, whether it's good, bad



81

00:05:25,120 --> 00:05:27,370

or indifferent data, if they enter nothing, it'll be empty.



82

00:05:27,370 --> 00:05:29,890

If they entered the wrong information, it'll be the wrong information.



83

00:05:30,610 --> 00:05:36,460

Then I create a new form, pass it through my validation, which has one rule right now that has to



84

00:05:36,460 --> 00:05:37,540

have first name.



85

00:05:38,170 --> 00:05:44,170

And if it's not valid, I just pass that reservation object that I created here and I pass the form



86

00:05:44,170 --> 00:05:45,070

that I created here.



87

00:05:45,430 --> 00:05:51,640

So because there's information in both form and data now, it displays on the form and that's all there



88

00:05:51,640 --> 00:05:52,170

is to it.



89

00:05:52,570 --> 00:05:54,160

So let's go back and clean a few things up.



90

00:05:54,820 --> 00:06:00,610

First of all, I want this same error message to do is to be displayed for all of my fields, whatever



91

00:06:00,610 --> 00:06:01,720

the error message may be.



92

00:06:01,720 --> 00:06:03,880

But I can't use my first name here.



93

00:06:03,880 --> 00:06:07,420

I have to use the last name, which I cannot spell right.



94

00:06:08,470 --> 00:06:09,540

Same thing for email.



95

00:06:09,580 --> 00:06:13,000

Might be a different error message, but I definitely if there's an error, I want it displayed.



96

00:06:13,690 --> 00:06:16,300

And the same thing for phone, which is phone.



97

00:06:17,410 --> 00:06:24,850

OK, and I also had this little bit that goes inside the class, so it puts that nice coloring around



98

00:06:24,850 --> 00:06:28,570

the input and look at that, I misspelled label everywhere the label.



99

00:06:30,280 --> 00:06:30,970

That one's right.



100

00:06:31,470 --> 00:06:32,470

No big deal.



101

00:06:33,850 --> 00:06:38,860

Eladio, am I to automatically fix the closing to yours.



102

00:06:38,860 --> 00:06:41,010

Might not check label.



103

00:06:41,770 --> 00:06:44,320

OK, inside class form control.



104

00:06:44,320 --> 00:06:47,320

I could again put that logic with form errors.



105

00:06:47,320 --> 00:06:49,930

Get this time its last name to change that the last name.



106

00:06:49,990 --> 00:06:50,950

Nothing else changes.



107

00:06:51,940 --> 00:07:03,250

And for this one with form errors get this time it's email and then for phone inside that class and



108

00:07:03,250 --> 00:07:05,590

this time it's email and I should work.



109

00:07:06,040 --> 00:07:11,950

So if I come back here now and reload this oh reload it this way by clicking up here in the world bar



110

00:07:11,950 --> 00:07:14,830

and hit enter and try making a reservation.



111

00:07:14,830 --> 00:07:18,670

Now I should get an error message for only the first one, but it should work.



112

00:07:18,670 --> 00:07:22,300

But if I add the required for these three that it'll work for those as well.



113

00:07:22,780 --> 00:07:29,530

Now last time I said, when you look at the handlers which are right here when we're doing the check,



114

00:07:29,530 --> 00:07:34,840

I said it's really awkward to have to put one command for every single required field.



115

00:07:35,230 --> 00:07:42,010

And I suggest that it might be better in our forms package to either change the hands or to add a new



116

00:07:42,490 --> 00:07:43,210

function in there.



117

00:07:43,240 --> 00:07:44,380

So how are we going to do that?



118

00:07:44,410 --> 00:07:46,910

Well, it's actually easier than you might think.



119

00:07:47,110 --> 00:07:50,400

All I want to do is create a new function and I'll put it right here func.



120

00:07:50,560 --> 00:07:58,150

And again, it has to point to the form where a form pointer the receiver and I'm going to call this



121

00:07:58,150 --> 00:07:58,720

when required.



122

00:07:59,380 --> 00:08:05,260

And this one is going to take one name, one parameter fields, but I'm going to make it off type dot,



123

00:08:05,260 --> 00:08:06,550

dot, dot, string.



124

00:08:07,480 --> 00:08:08,470

And you haven't seen that yet.



125

00:08:08,470 --> 00:08:09,400

It doesn't return anything.



126

00:08:09,850 --> 00:08:16,510

This is called a very ADIC function and a very ADIC function says you can have as many types of string



127

00:08:16,510 --> 00:08:22,870

as you want here, which means I can pass that one required field or five required fields or 50 required



128

00:08:22,990 --> 00:08:24,760

fields and it will do everything I want.



129

00:08:24,760 --> 00:08:30,610

And what I'm going to do in the function is range through that field variable, which might have at



130

00:08:30,610 --> 00:08:33,220

least one thing in it, but it might have 10 things in it.



131

00:08:33,220 --> 00:08:37,780

So I'll just go for and I don't care about the index, so I'll use the underscore to ignore it.



132

00:08:38,170 --> 00:08:41,170

Field is assigned the value of.



133

00:08:44,620 --> 00:08:48,160

Range fields and what do I want to do inside there?



134

00:08:48,190 --> 00:08:50,050

Well, let's get the value of that.



135

00:08:50,050 --> 00:08:56,830

So value is equal F, which is our form object, which we got from a receiver and that has a feel,



136

00:08:56,830 --> 00:08:58,300

a function called get.



137

00:08:58,570 --> 00:09:03,110

And I can get the key of the string by string, which is field in this case.



138

00:09:03,130 --> 00:09:08,800

So if I have first name, last name, email, phone, as parameters passed the first time I come through



139

00:09:08,800 --> 00:09:10,570

here, value which I'm going to spell.



140

00:09:10,570 --> 00:09:10,840

Right.



141

00:09:12,190 --> 00:09:13,300

Which I'm eventually going to spell.



142

00:09:13,300 --> 00:09:13,570

Right.



143

00:09:17,460 --> 00:09:24,900

Value will say go to the form object right here, this receiver call the method get, which is right



144

00:09:24,900 --> 00:09:25,320

on that.



145

00:09:25,560 --> 00:09:29,550

It's right in this package forms and get the field named first name.



146

00:09:29,790 --> 00:09:31,740

OK, so I've got it great.



147

00:09:32,040 --> 00:09:35,430

And I say really simple stuff.



148

00:09:35,430 --> 00:09:39,360

If and this is a package we haven't used much, but we will be using it more.



149

00:09:40,320 --> 00:09:48,270

Strings is a built in package in the Go Standard Library and I'm going to call Trem Space, Trem Space.



150

00:09:48,270 --> 00:09:52,200

And all that does is dreamspace from either end of the string, end of the string is empty, will have



151

00:09:52,200 --> 00:09:54,480

nothing, but it'll give me everything I need in here.



152

00:09:54,480 --> 00:10:01,770

So it removes extraneous spaces that the user might have typed in by mistake, if that is equal to nothing.



153

00:10:02,370 --> 00:10:05,600

In other words, if that form has no value.



154

00:10:05,610 --> 00:10:07,700

And of course, I have to put the value in there what I'm trimming.



155

00:10:08,850 --> 00:10:14,340

So when you trimmed the value, when you remove the extraneous spaces from the variable value which



156

00:10:14,340 --> 00:10:18,780

is currently assigned to first name, if that's the first parameter pass to it, if that's equal to



157

00:10:18,780 --> 00:10:20,340

nothing, then what do I want to do?



158

00:10:20,340 --> 00:10:31,050

Just add an error f errors and I'll call the method add and I'm passing at the name of field, which



159

00:10:31,050 --> 00:10:35,580

is what it's when we arrange through the list of fields, it'll be whatever that field currently is



160

00:10:36,150 --> 00:10:37,250

and an error message.



161

00:10:37,500 --> 00:10:44,430

This field cannot be like that's all I have to do and I don't have to do anything else because if this



162

00:10:44,430 --> 00:10:51,720

condition is never met, this adding of an error will never fire, which means I can go back to my handlers



163

00:10:51,870 --> 00:10:58,950

and don't use this this comment that out, I'll just say form required and pass in the fields.



164

00:10:59,040 --> 00:11:05,490

First name, last name and I'll leave one out email Ali Fona.



165

00:11:05,700 --> 00:11:07,500

OK, so I'm not passing that now.



166

00:11:07,500 --> 00:11:11,220

I'm not calling the house function and I'm going to change that in a minute because it will be useful



167

00:11:11,220 --> 00:11:11,760

later on.



168

00:11:12,780 --> 00:11:13,860

But I'm just calling this.



169

00:11:14,220 --> 00:11:20,730

If any of these have an empty string for their value, then form will have an error added to its errors.



170

00:11:20,970 --> 00:11:21,660

A variable.



171

00:11:21,810 --> 00:11:29,580

So let's restart this, close the application, start it back up, go back to our page and see if we



172

00:11:29,580 --> 00:11:30,270

did anything wrong.



173

00:11:30,270 --> 00:11:36,090

So I'll reload the page and I'll just try something different and look, they're required.



174

00:11:36,270 --> 00:11:39,390

Oh, I made a mistake on the form one somehow, which is why I'm testing it this way.



175

00:11:40,080 --> 00:11:41,580

Let's go back and fix that.



176

00:11:41,580 --> 00:11:43,710

So I have to be on the make reservation page.



177

00:11:44,100 --> 00:11:49,020

And I said on the last one I left email there when that should have been phone so I can just go back



178

00:11:49,020 --> 00:11:49,230

here.



179

00:11:50,150 --> 00:11:51,840

It should reload the page.



180

00:11:51,840 --> 00:11:58,050

We rebuild the cache on the lower than it does not go to only three required field because I left my



181

00:11:58,050 --> 00:11:58,860

phone out.



182

00:11:59,220 --> 00:12:00,990

So that works really well.



183

00:12:00,990 --> 00:12:04,680

But what if I feel some information in A, B, C and D?



184

00:12:06,500 --> 00:12:07,490

And it gives me an error.



185

00:12:07,610 --> 00:12:08,810

Let's find out what the error is.



186

00:12:11,320 --> 00:12:17,000

It's got to be in somewhere in my template formed Ayers Target phone Ardizzone, that looks OK.



187

00:12:17,560 --> 00:12:23,410

What I do want to do here is just start commenting things like comment on it and I reload the page and



188

00:12:23,410 --> 00:12:24,650

let it repost the information.



189

00:12:24,670 --> 00:12:25,500

Still got an error there.



190

00:12:25,510 --> 00:12:26,430

So it's not in there.



191

00:12:29,350 --> 00:12:33,570

Save that, reload the page, still have an error.



192

00:12:36,570 --> 00:12:44,520

Commentator, reload the page, still have an error, and I will comment this last one at.



193

00:12:49,670 --> 00:12:51,050

Oh, you know what, I'm done.



194

00:12:51,470 --> 00:12:52,380

I'll be uncommented.



195

00:12:53,330 --> 00:12:54,350

Let me just undo all that.



196

00:12:56,120 --> 00:12:57,680

Of course, it's there's no error.



197

00:12:57,860 --> 00:13:02,090

When I reload this page, it's blank because I passed validation.



198

00:13:02,150 --> 00:13:07,610

So I need to fail validation in order to reload the page, which means I need to go back and uncommented



199

00:13:07,610 --> 00:13:08,360

this last one.



200

00:13:12,280 --> 00:13:15,310

Reload the page there where now this is required.



201

00:13:15,340 --> 00:13:16,180

This is required.



202

00:13:16,190 --> 00:13:17,050

This is required.



203

00:13:17,080 --> 00:13:18,070

This is not so.



204

00:13:18,070 --> 00:13:19,710

I'll put one in here, one in there.



205

00:13:19,720 --> 00:13:22,630

Leave that one empty because it's required and put one in there.



206

00:13:22,640 --> 00:13:26,650

So I should get A, B and C and an arrow displayed on this.



207

00:13:27,040 --> 00:13:28,150

And I do.



208

00:13:28,390 --> 00:13:30,220

That works really well.



209

00:13:30,670 --> 00:13:32,780

What if that's not the only validation I want?



210

00:13:32,800 --> 00:13:37,150

What if I want it to fail if you don't have at least two characters or three characters in first name?



211

00:13:37,360 --> 00:13:40,110

Well, we don't have a validator for that yet, so let's go write one.



212

00:13:40,300 --> 00:13:46,830

It's really easy to go back to our format package reforms page and we will create a new very a new and



213

00:13:46,860 --> 00:13:47,470

a validator.



214

00:13:47,470 --> 00:13:49,390

And this one I'm going to go with.



215

00:13:49,480 --> 00:13:50,590

I'll just write it from scratch.



216

00:13:50,590 --> 00:13:57,760

I don't need to copy and paste func f pointier to form and I'll call this one min length which will



217

00:13:57,760 --> 00:13:59,320

check for the minimum length of the string.



218

00:13:59,620 --> 00:14:01,420

And it needs to know three things.



219

00:14:01,420 --> 00:14:02,950

First of all, what's the field.



220

00:14:03,100 --> 00:14:03,970

And it'll be a string.



221

00:14:05,590 --> 00:14:07,750

Secondly, what's the minimum like you want.



222

00:14:07,750 --> 00:14:09,780

And I'll call that length and that'll be an entry.



223

00:14:10,210 --> 00:14:11,920

And thirdly, what's the request.



224

00:14:12,070 --> 00:14:17,080

And that's going to be R and a pointer to a HTP request.



225

00:14:17,860 --> 00:14:23,050

So I'll pass that on that and it's going to return bool, even though it doesn't have to.



226

00:14:23,110 --> 00:14:23,680

We're going to do that.



227

00:14:23,770 --> 00:14:27,820

OK, so how do we do this.



228

00:14:27,830 --> 00:14:33,160

Well, X is assigned are not formed yet, whatever your field name is.



229

00:14:33,940 --> 00:14:37,240

So that gets us a string and then we just check to see if it's long enough.



230

00:14:37,240 --> 00:14:45,850

If Lenn of X is less than the length, what do I want to do at an error once again, after errors don't



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add and it's for a field, so we pass in our field name and the error is this time I'm going to use



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my format as print f package or function because I need to put the I need to give them a more meaningful



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error message than hope your your fields not long enough.



234

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Well how long does it have to be.



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We might as well tell them so we'll say this field must be at.



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Liste percent D characters long, and then we'll replace that placeholder percent D with our Ent.,



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which we hold length, so we add that error and will return false, even though we're not using using



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this bull at some point, this might be useful information.



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Otherwise we return trip.



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So if this never gets executed because the minimum length is met, that requirement that it returns



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true, otherwise it returns false and stops processing because we return that function, return from



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that function.



243

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So let's give it a comment in length.



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And it says checks for string, minimum length.



245

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OK, so now I have this min length function.



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Let's go use it.



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So I'm going to on this page like this, be at least three characters long.



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So back and find my handlers.



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There they are.



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And I can get rid of this comic because I'm not using it anymore.



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How do I add another rule to my validation while I just call form again?



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One of the methods on form, form in length, my field will be first name and the minimum length will



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be three.



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And it also expects my requests will pass at my request variable, which I have because I'm writing



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a handler right there.



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Stop the application, run the application, go back to this form, reload the page by highlighting



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that you are hitting enter so it doesn't repost the form data and I'll put in a first name.



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That's not long enough, eh?



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And I'll put in a last name B and an email C or C C and will leave Fome empty because it's not required.



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So it should give me an error on this.



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But there's actually two errors being generated.



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One is actually no, there's only one error being generated on this one.



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So I can leave it empty right now.



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So this if I do it this way, it's going to generate two errors.



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The first one is this field is required and you've given me nothing.



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And the second is there's actually a minimum character length requirement on this field.



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Which one is it going to display?



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It's going to display the one we added in first, because when we call, get on our R.



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Where is it here?



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It's on our errors.



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I think it is when we call get we're returning indexed zero, which is the first thing in that slice.



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So here when I filled this out, the first error in that slice is the field cannot be blank.



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Now let's put a character in there which still is going to fail because it's not at least three characters



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along this field.



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Must be at least three three characters long.



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And now if I fill it out, it'll submit it and we'll get a blank page.



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All right.



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Last thing I want to do right now is to go back to our handlers, know our forms.



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00:17:54,860 --> 00:17:57,680

And I said I was going to make a change to required.



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Well, I'm not required to has, but I need a permit for required.



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So I'll put a comment in here.



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Checks for required fields.



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OK.



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And it is under has I said, well, I don't want to add an error for this one necessarily and I don't



285

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want an added error for this one.



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This will become a useful function because there are certain fields like a checkbox, for example,



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that are actually handled differently than a text input.



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So when you put a checkbox on a form, if the checkbox is checked, then that value, whatever the input



289

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is named, the input type equals checkbox, if I call mine, agreed to terms and conditions that variable



290

00:18:38,600 --> 00:18:41,900

agree to terms and conditions is passed as part of the post request.



291

00:18:42,230 --> 00:18:45,490

But if it's not not checked, it's not even included at all.



292

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So you can't do anything with it.



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So this has will be a useful feature for us to check whether or not submitted form data includes a certain



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field.



295

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So I'm going to leave that one alone except for removing that error.



296

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So now it's available to us and we are good to go.



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00:19:04,430 --> 00:19:09,260

The last thing we need to actually check on this make reservation form the posting, part of it at least,



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is that email is really an email and we'll do that in the next package or next lecture, and we'll do



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it by importing a third party package called Go Validator, which is really good.



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A time tested.



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It's been around for a long time and I use it every day and we'll do that in the next lecture.