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Updated 056 How to use the file field type to upload a file in JCB (markdown)

Amigo 2019-09-12 09:15:10 +02:00
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056-How-to-use-the-file-field-type-to-upload-a-file-in-JCB.md

@ -199,8 +199,12 @@ JavaScript to the rescue. I'm going to use JavaScript to do this. We have add ou
[00:53:30](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h53m30s)
To know where the values are, we will go back to its view.html.php area. We see that it gets the $this->item and it places it in the item global class value. We have the value item. We can therefore check if the banner is in the item. What I will do that you can see what's happening. Copy and then I'm going to go back to the edit.view where we put our html. I'm going to say [00:54:09](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h54m09s) php var_dump($this->item); that specific value, and save. Let's go to the interface. We have to add the word 'jexit' and go a little bit up because we got a little fader, it's going to hide this and let's just take that out for now that we can see [00:54:44](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h54m44s) what's going on and then let's refresh the page. We got it all broken that's fine. Let's take it to the top, we've added it here above everything, it should show now. Refresh, there we go that's what we want to see. [00:55:11](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h55m11s) We see that it is publicly accessible, there's the banner value. We can check whether there is a value in this, whether it's a string and has a value, because we know we controlling that value. The user cannot manually add that value there. It needs to do it through the upload field. We can check whether that has a string, and if it does, we can create a little show the image [00:55:39](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h55m39s) underneath it's appropriate placement. That's how I get to see the value. If you are dealing with something similar, you can do these kind of poking into the result sets to exactly where is what, how does it look and how do I get to it? You're not dependent on the way not knowing what's going on. Back in JCB we going to say [00:56:12](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h56m12s)
To know where the values are, we will go back to its view.html.php area. We see that it gets the $this->item and it places it in the item global class value. We have the value item. We can therefore check if the banner is in the item. What I will do that you can see what's happening. Copy and then I'm going to go back to the edit.view where we put our html. I'm going to say [00:54:09](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h54m09s) php var_dump($this->item); that specific value, and save. Let's go to the interface. We have to add the word 'jexit' and go a little bit up because we got a little fader, it's going to hide this and let's just take that out for now that we can see [00:54:44](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h54m44s) what's going on and then let's refresh the page. We got it all broken that's fine. Let's take it to the top, we've added it here above everything, it should show now. Refresh, there we go that's what we want to see. [00:55:11](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h55m11s) We see that it is publicly accessible, there's the banner value. We can check whether there is a value in this, whether it's a string and has a value, because we know we controlling that value. The user cannot manually add that value there. It needs to do it through the upload field. We can check whether that has a string, and if it does, we can create a little show the image [00:55:39](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h55m39s) underneath it's appropriate placement. That's how I get to see the value. If you are dealing with something similar, you can do these kind of poking into the result sets to exactly where is what, how does it look and how do I get to it? You're not dependent on the way not knowing what's going on.
?????
Back in JCB we going to say [00:56:12](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h56m12s) (isset($this-item->banner), and if it is a string, I'm using the helper class. We've a function in the helper class called 'checkString', to see whether it has a length, and that it is a string. [00:56:36](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h56m36s) Not an array or a boolean or something like that. This is the way you can use the helper class, use [[[Component]]]Helper:: and there you go. If that is true, we want to load the image [00:57:01](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h57m01s) because then it exists. We want to see where do we want to add this image, it's underneath the the upload. I'm going to have it show up like a normal image. We are going to do some jQuery. We are doing this image source and we are echoing the item banner because we know it's a string. We can add a class. You can target this class [00:57:30](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h57m30s) and make it nice with CSS, add your CSS to view. Add the the class name that you are going to target with your CSS and you can do all kind of nice things with it. You are going to have alt and banner. We are going to insert it after the banner field. It is to know what this value is, we open one of those views, [00:57:57](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h57m57s) and we drill down until we find our inspector, grab maybe the Banner label, then drill until we find the id_jform(banner). That's how I get it. [00:58:13](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h58m13s) We just add this after the control group, that it would look nice, fits in with the layout and I think it's broken. That should trigger it. So we saying; //see if we have a banner, if we do, add this javaScript, we are done. Save. Let's compile and in install. [00:58:37](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h58m37s) Go back to our view. Close this and refresh. Go to More and there is our image.
(isset($ And If It is a string I'm using the helper class here we've got a function in the helper class called check string To see whether it has a length And that it is a string [00:56:36](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h56m36s) Not an array or a Boolean or something like that Now This is the way you can Sort of use the helper class to use the brackets brackets brackets Component and then bracket bracket bracket helper colon colon and there you go And If that is true We want to Obviously load the image [00:57:01](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h57m01s) Because then it exists Now we wanna see where do we wanna add this image and it's actually underneath the the upload I'm just gonna have it show up like a normal image so we gonna just do some jQuery to To do that Ok so we are doing This image source and we are echoing the item banner because we know it's a string We can add a class here Now you can target this class [00:57:30](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h57m30s) And make it nice with CSS Just add your CSS is here To view Just here you can add your CSS so here you just add the the class name that you gonna target with your CSS and you can do All kind of nice things with it you gonna have alt and banner And we gonna insert it after the banner Field so the You know is the way we know what this value is Is we open one of those views [00:57:57](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h57m57s) like so And we drill down Until we find That's so we use our inspector grab maybe The banner Label then drill until we find the ID J form banner That's how I get it ok [00:58:13](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h58m13s) And Then We just add this after It after the control group so that looks nice fits in with the layout and I think it's broken Ok so That should trigger it So we saying See if we have a banner if we do add this JavaScript we done Save Now let's compile and in Install [00:58:37](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h58m37s) So compile And install Go back to our view And Obviously close this and refresh Now go to more and Walla there is our image Now to show you it in action we gotta change the image It won't remove the old one [00:59:05](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h59m05s) But it will immediately show you the new one once we click save So let's do that So I've selected to different image from my computer and then click save And go back and wow there is the new image so that is how you could implement The file Field type in JCB so as you can see there is some custom scripting needed I'm gonna quickly I show you a URL where you can go and get this custom script And use it in your own component And of course [00:59:44](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h59m44s) May be adapted to change it At least use it as a place to start with And Start using the Custom Joomla field type For uploading files Thanks for watching Is any questions or even Suggestions of how to do this easier or faster or safer Leave the commons in the area below the video I'll be happy to look at it and [01:00:11](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=01h00m11s) Make any necessary changes to our snippet ok Or even at the snippet itself that might be a better place And the gits where the URL I'm gonna show you now Are you can go there and make comments there and we will just make pull request in the whatever and we'll fix it up so So that works well for everyone thanks for watching
### Changing Of Image - Won't Remove Old One
[00:58:59](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h58m59s)
Now to show you it in action, we are going to change the image. It won't remove the old one, but it will immediately show you the new one once we click save. Let's do that. I've selected a different image from my computer and then click save. Go back and there is the new image. That is how you could implement the file field type in JCB. You can see there is some custom scripting needed, I'm quickly going to show you a URL where you can go and get this custom script, use it in your own component. Of course [00:59:44](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=00h59m44s) maybe adapt it, change it. At least use it as a place to start with. Start using the Custom Joomla field type for uploading files. If there is any questions or even suggestions of how to do this easier or faster or safer, leave the commons in the area below the video. I'll be happy to look at it and [01:00:11](https://www.youtube.com/watch?v=o482sK4DxkM&list=PLQRGFI8XZ_wtGvPQZWBfDzzlERLQgpMRE&t=01h00m11s) make any necessary changes to our snippet or even at the snippet itself, that might be a better place, and the Gits where the URL is, or you can go there and make comments there and we will make pull request in the whatever and we'll fix it up, that it will work well for everyone.