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PDF.js

[PDF.js] Prevent loading default pdf

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This can be done by appending ?file= to the src path, like it is mentionend here.

<!-- "?file=" prevents loading the default document -->
<iframe id="pdf-js-viewer" src="/pdf/web/viewer.html?file=" title="webviewer" frameborder="0" width="100%" height="700" allowfullscreen="" webkitallowfullscreen=""/>

Or by setting the variable defaultUrl to blank using the onload event.

document.addEventListener("webviewerloaded", async () => {
   let pdfViewerIFrame = document.getElementById("pdf-js-viewer")
   //https://github.com/mozilla/pdf.js/blob/master/web/app_options.js
   pdfViewerIFrame.contentWindow.PDFViewerApplicationOptions.set("defaultUrl", "") //prevent loading default pdf
})

CAP

[CAP] Using a Tree in SAPUI5 Freestyle app

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The following Links helped me implementing the tree functionality:

https://sapui5.hana.ondemand.com/#/entity/sap.m.Tree/sample/sap.m.sample.TreeOData

https://answers.sap.com/questions/13192367/sap-cds-how-to-add-hierarchy-annotations-saphierar.html

Define the data model in data-model.cds

entity Node {
    key NodeID         : Integer;
        HierarchyLevel : Integer;
        ParentNodeID   : Integer;
        Description    : String;
        drillState     : String;
}

Create testdata in my.test-Node.csv

NodeID;HierarchyLevel;ParentNodeID;drillState;Description  
1;0;null;"expanded";"1"
2;0;null;"expanded";"2"
3;0;null;"expanded";"3"
4;1;1;"leaf";"1.1"
5;1;1;"expanded";"1.2"
6;2;5;"leaf";"1.2.1"
7;2;5;"leaf";"1.2.2"

and deploy the testdata to your local sql db

cds deploy --to sqlite:db/test.db

Service Definition in test-service.cds

using my.test as db from '../db/data-model';

service testService {
     entity Nodes as projection on db.Node;
}

add the Tree controll to your Fiori UI view Tree.view.xml

		<Tree
		    id="Tree"
		    items="{path: '/Nodes',
				    parameters : {
		                countMode: 'Inline',
                        numberOfExpandedLevels: 3, 
                        treeAnnotationProperties: { 
                                                    hierarchyLevelFor : 'HierarchyLevel', 
                                                    hierarchyNodeFor : 'NodeID', 
                                                    hierarchyParentNodeFor : 'ParentNodeID', 
                                                    hierarchyDrillStateFor : 'drillState' 
                                                    }
		            }
            }">
			<StandardTreeItem title="{Description}"/>
		</Tree>

The output should be similar to this:

Fiori / SAPUI5

[SAPUI5] Filter on Model read

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this.getModel().read("/Object", {
                filters: [
                    new Filter({
                        path: "firstName",
                        operator: FilterOperator.EQ,
                        value1: "Max"
                    }),
                    new Filter({
                        path: "lastName",
                        operator: FilterOperator.EQ,
                        value1: "Mustermann"
                    })
                ],
                success: oData => { },
                error: err => { }
});
JavaScript / nodejs

[nodejs] read and write a file

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https://nodejs.dev/learn/reading-files-with-nodejs

https://nodejs.dev/learn/writing-files-with-nodejs

        const fs = require("fs")

        try {
            // read from local folder
            const localPDF = fs.readFileSync('PDFs/myFile.pdf')

            //write back to local folder
            fs.writeFileSync('PDFs/writtenBack.pdf', localPDF )

        } catch (err) {
            console.error(err)
        }

Converting to Base64

        try {
            // read from local folder
            const localPDF = fs.readFileSync('PDFs/myFile.pdf')
            const localBase64 = localPDF.toString('base64')

            //write back to local folder
            fs.writeFileSync(`PDFs/writtenBack.pdf`, localBase64, {encoding: 'base64'})

        } catch (err) {
            console.error(err)
        }

Reading and writing using streams with pipe

        //read and write local file
        const reader = fs.createReadStream("PDFs/myFile.pdf")
        const writer = fs.createWriteStream('PDFs/writtenBack.pdf');
        reader.pipe(writer)

Fiori / SAPUI5

[SAPUI5] Binding with filter on XML View

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https://sapui5.hana.ondemand.com/sdk/#/topic/5338bd1f9afb45fb8b2af957c3530e8f.html

There are two ways to use a filter.

Option 1:

items="{
				path: '/myItems',
				parameters : {
				  $filter : 'itemName eq \'myItemName\'',
				  $orderby : 'createdAt desc'
				},
}">

Option 2:

items="{
				path: '/myItems',
				parameters : {
				  $orderby : 'createdAt desc'
				},
				filters : {                                     
				  path : 'itemName ',
				  operator : 'EQ',
				  value1 : 'myItemName'
				},
}">

Fiori / SAPUI5

[SAPUI5] Toogle Dark mode from Shell Header

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There are several different types of buttons you can add to the Shell Header: https://sapui5.hana.ondemand.com/sdk/#/api/sap.ushell.renderers.fiori2.Renderer%23methods/Summary
For my test I choose the “addHeaderEndItem” Button. Add the fowlloing logic in the Component.js file to create the button and the logic for switching the theme:

		_addHeaderButton: function () {
			const oRenderer = sap.ushell.Container.getRenderer("fiori2");
			oRenderer.addHeaderEndItem("sap.ushell.ui.shell.ShellHeadItem", {
				id: "toogleTheme",
				icon: "sap-icon://circle-task-2",
				visible: "{device>/orientation/landscape}",
				tooltip: "Switch Theme",
				press: (oEvent) => {
					const toogleButton = oEvent.getSource();
					if (toogleButton.getIcon() === "sap-icon://circle-task-2") {
						sap.ui.getCore().applyTheme("sap_fiori_3_dark");
						toogleButton.setIcon("sap-icon://circle-task");
					} else {
						sap.ui.getCore().applyTheme("sap_fiori_3");
						toogleButton.setIcon("sap-icon://circle-task-2");
					}
				}
			}, true);
		},

Afterwars you need call the method in the init() function of the component. No reload the app and you will find the new button in the top right corner. Pressing will switch the theme to dark or back to light theme.

Docker

[Docker] OCI runtime create failed on Ubuntu 18.04.

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Yesterday after rebooting my Server running Ubuntu 18.04. I couldn’t run most of my Docker Container. Strangely, some worked and some did not. If not I always got some OCI runtime error messages:

$ docker-compose up -d
ts3_teamspeak_1 is up-to-date
Creating ts3_teamspeak-db_1 ... error

ERROR: for ts3_teamspeak-db_1  Cannot start service teamspeak-db: OCI runtime create failed: container_linux.go:380: starting container process caused: process_linux.go:402: getting the final child's pid from pipe caused: EOF: unknown

After googling a bit, I found the solution. I did an apt upgrade before rebooting and my Docker version was updated to v5.20. And it seems that Ubuntu 18.04. and Docker v5.20 are not working well together. Therefore I had to downgrade docker to v5.18. Find more here.

 apt install docker-ce=5:18.09.1~3-0~ubuntu-bionic
 apt install containerd.io=1.2.2-1