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Updated 045 Adding your own rule validation to a field in JCB (markdown)

Amigo 2019-08-26 09:50:42 +02:00
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045-Adding-your-own-rule-validation-to-a-field-in-JCB.md

@ -44,23 +44,24 @@ But we can change that. This new licence tag has just been added to it(see video
[00:10:02](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h10m02s)
Now let us test this. Open the component in the back end, go to 'Greetings' and click 'New'. 'Greetings' had been set to have a length of at least 10 characters. Let's test this. 'Greeting' is added which does not have enough characters and click 'Save'. It tells us, 'WARNING: Invalid Field: Greetings'. [00:10:36](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h10m36s) One little change is necessary to get this to work. For some reason they want this file all lowercase. The 'T' uppercase in 'strlen.Ten' need to change to 'T' lowercase. Do this also with the file in our Custom folder. Then in the actual file the 'T' should be lowercase. Perhaps the upper case camel rule is used to sort of break-up the name.<<<<
That was what I had to do to get it to work. [00:11:20](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h11m20s) I also need to update the component to include this file since the name is changed, it will no longer know where it is. We can go directly to that file area with thhowe shortcut underneath hello_world and we see it is no longer selected, so we scroll down, select it again and save and close. Now that we've fixed the little glitch which I created myself, let's go back to see this again in action. [00:11:57](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h11m57s) And save. And Invalid field: Greetings. That isn't very helpful. Maybe you would like to also show a custom message so that the user would at least know more about what is going on here. Before we do that let's add enough values and see if that it actually saves. It's saved successfully. Close. Our Greetings is been saved and our value here(Greetings) is more than 10 characters, so it was valid.
Now let us test this. Open the component in the back end, go to 'Greetings' and click 'New'. 'Greetings' had been set to have a length of at least 10 characters. Let's test this. 'Greeting' is added which does not have enough characters and click 'Save'. It tells us, 'WARNING: Invalid Field: Greetings'. [00:10:36](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h10m36s) One little change is necessary to get this to work. For some reason they want this file all lowercase. The 'T' uppercase in 'strlen.Ten' need to change to 'T' lowercase. Do this also with the file in our Custom folder. Then in the actual file the 'T' should be lowercase. Perhaps the upper case camel rule had been used to sort of break-up the name to get it to work. [00:11:20](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h11m20s) The component needs to be updated to include this file since the name has been changed, and will no longer know where it is. Go directly to that file area with the shortcut below 'hello_world' and see it is no longer selected. Scroll down, and select it again and save and close. Now that the little glitch is fixed which I had created , go back to see this again in action and save.[00:11:57](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h11m57s) It shows 'Invalid field: Greetings'. That is is not very helpful. Maybe you would like to show a custom message so that the user would at least know more about what is going on. Before we do that let's add enough values and see if that it actually saves. It was saved successfully. Close. Our 'Greetings' has been saved and our value here(Greetings) is more than 10 characters, so it was valid.
### Add A Custom Messages To Validation
[00:12:33](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h12m33s)
Now let's go add a custom message to our validation. Remember whatever you do to the live version of this file, will not necessarily become part of the next compilation. Adding a custom message you need to go back to component builder, custom, and to that actual file(strlenten.php) and add it in there(see video) then recompile your component and it will automatically update the live demonstration. The other way to test before doing it live or before adding it to the core of your component, is to go to the live file which as we saw, is [00:13:17](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h13m17s) in com_hello_world, models, rules, strlenten.php. Now let's add our custom message in here just to test. We using the element->addAttribute to the element message: Field must have more than 10 characters! That is one way of doing this of course there is another way.
Now let's add a custom message to our validation. Remember whatever you do to the live version of this file, will not necessarily become part of the next compilation. Adding a custom message you have to go back to Component Builder, Custom, and to that actual file(strlenten.php) and add it in there(see video) then recompile the component and it will automatically update the live demonstration. The other way to test before doing it live or before adding it to the core of your component, is to go to the live file which as we saw, is in 'com_hello_world', models, rules, 'strlenten.php'. [00:13:17](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h13m17s) Now add the custom message in here to test. The element'->addAttribute' is used as the element message: 'Field must have more than 10 characters!' That is one way of doing this of course there is another way.
### Add Messages In XML Path
[00:13:45](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h13m45s)
Again this takes us back to JCB and we go to the Fields. We open Greetings and we look for the attribute message. It doesn't have message. We need to add this attribute. We'd click on Field Type and we scroll down. Let's place this under Description. We say Message. It's changeable, [00:14:21](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h14m21s) it is translatable and it's optional. We don't make it compulsory. We got all set. Save and close. Let's add this message in Field Information to our XML field. Before we save this and go this path, let's first test our live [00:15:00](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h15m00s) change we made to the file and see if that also works. In the file we added attribute to the element and it return false. Good, let's go test this. We again open Name item and we take away a few characters and click save. We get a Warning message that it needs more than 10 characters. That option also works very well.
Again this takes us back to JCB and we go to the Fields. Open 'Greetings' and look for the attribute message. It does not have a message. To add this attribute, click on Field Type and scroll down. Place this under 'Description'.<<<<<<
We say Message. It's changeable, [00:14:21](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h14m21s) it is translatable and it's optional. We don't make it compulsory. We got all set. Save and close. Let's add this message in Field Information to our XML field. Before we save this and go this path, let's first test our live [00:15:00](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h15m00s) change we made to the file and see if that also works. In the file we added attribute to the element and it return false. Good, let's go test this. We again open Name item and we take away a few characters and click save. We get a Warning message that it needs more than 10 characters. That option also works very well.
[00:15:34](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h15m34s)
Now lets use the other one which I suppose is more convenient, unless you are checking multiple things and you would like to give multiple error messages based on those results then this implementation is the better option. But if you just got one message and it just needs to explain to the user one issue, then using the XML path I suppose is more convenient. In our custom file we haven't added that change. Let's go and compile our component and install. First we need to save and close out of this Field that the changes be captured. Then go to the Compiler [00:16:20](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h16m20s) and compile our component, install. Lets go look at the code. In the code we see our custom message is again not showing up. The greeting.xml we now have this translated message='COM_HELLO_WOLRD_GREETING_GREETING_MESSAGES'. Let's go test this. Again we open Name Field and first save it the way it is. [00:16:56](https://www.youtube.com/watch?v=Z6-ggKtX35o&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h16m56s) Lets take away two characters and save again. We get the expected message. This time around that message can be translated and as well it is in the XML file, it's not part of the actual function. We have now successfully added our own validation rule to one field within a view and we were able to include that rule into our component on compilation using adding custom files.