Hi folks,
Should really get started soon with the 2.0.0 release of the SVG node. My partner @Steve-Mcl and me had some feature requests in the past to add the ability for adding/removing SVG elements dynamically, by injecting input messages. So I implemented that tonight...
For those who want to play with it, the beta release can be installed from our Github account:
npm install bartbutenaers/node-red-contrib-ui-svg#panzoom
Some of the possibilities:
- New commands for "add_element" and "remove_element".
- Ability to specify a parent element or not (i.e. add by default to the root svg).
- Ability to replace an existing element by a new element (by specifying the existing id).
- Remove multiple elements with a single command, via a CSS selector.
The upper two Inject nodes in the following flow show the usage for a single element id, and the next two Inject nodes for multiple id's at once (via CSS selector):
[{"id":"2b26f529.49dbfa","type":"ui_svg_graphics","z":"4ae15451.7b2f5c","group":"5a9e7538.2c2fbc","order":2,"width":"6","height":"6","svgString":"<svg x=\"0\" y=\"0\" height=\"300\" viewBox=\"0 0 300 300\" width=\"300\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:svg=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n</svg>","clickableShapes":[{"targetId":"#circle_1","action":"click","payload":"#circle_1","payloadType":"str","topic":"#circle_1"}],"smilAnimations":[],"bindings":[],"showCoordinates":true,"autoFormatAfterEdit":false,"showBrowserErrors":false,"selectorAsElementId":true,"outputField":"payload","editorUrl":"http://drawsvg.org/drawsvg.html","directory":"","panEnabled":false,"zoomEnabled":false,"controlIconsEnabled":false,"dblClickZoomEnabled":false,"mouseWheelZoomEnabled":false,"name":"","x":1820,"y":160,"wires":[[]]},{"id":"4eaee1f9.e29a","type":"inject","z":"4ae15451.7b2f5c","name":"Add element \"newElement\"","topic":"","payload":"{\"command\":\"add_element\",\"elementType\":\"text\",\"elementId\":\"burglar\",\"elementAttributes\":{\"x\":\"50\",\"y\":\"60\",\"font-family\":\"FontAwesome\",\"font-size\":\"35\",\"text-anchor\":\"middle\",\"alignment-baseline\":\"middle\",\"stroke-width\":\"1\"},\"elementStyleAttributes\":{\"fill\":\"blue\",\"stroke\":\"black\"},\"textContent\":\"fa-video-camera\"}","payloadType":"json","repeat":"","crontab":"","once":false,"onceDelay":0.1,"showConfirmation":false,"confirmationLabel":"","x":1490,"y":160,"wires":[["2b26f529.49dbfa"]]},{"id":"13d4363.22c11ca","type":"inject","z":"4ae15451.7b2f5c","name":"Remove element","topic":"","payload":"{\"command\":\"remove_element\",\"elementId\":\"burglar\"}","payloadType":"json","repeat":"","crontab":"","once":false,"onceDelay":0.1,"showConfirmation":false,"confirmationLabel":"","x":1460,"y":200,"wires":[["2b26f529.49dbfa"]]},{"id":"7b4a624b.97e90c","type":"function","z":"4ae15451.7b2f5c","name":"Set random coordinates","func":"// Generate random coordinates between 0 and 300\nvar x = Math.floor(Math.random() * 300);\nvar y = Math.floor(Math.random() * 300);\nmsg.payload.elementAttributes.x = x;\nmsg.payload.elementAttributes.y = y;\nmsg.payload.elementId = \"burglar_\" + Math.random();\nreturn msg;","outputs":1,"noerr":0,"x":1670,"y":300,"wires":[["2b26f529.49dbfa"]]},{"id":"9b51204a.ea4f9","type":"inject","z":"4ae15451.7b2f5c","name":"Add element","topic":"","payload":"{\"command\":\"add_element\",\"elementType\":\"text\",\"elementAttributes\":{\"font-family\":\"FontAwesome\",\"font-size\":\"35\",\"text-anchor\":\"middle\",\"alignment-baseline\":\"middle\",\"stroke-width\":\"1\"},\"elementStyleAttributes\":{\"fill\":\"blue\",\"stroke\":\"black\"},\"textContent\":\"fa-male\"}","payloadType":"json","repeat":"","crontab":"","once":false,"onceDelay":0.1,"showConfirmation":false,"confirmationLabel":"","x":1450,"y":300,"wires":[["7b4a624b.97e90c"]]},{"id":"7bc4610d.d954c","type":"inject","z":"4ae15451.7b2f5c","name":"Remove all","topic":"","payload":"{\"command\":\"remove_element\",\"selector\":\"[id^=burglar]\"}","payloadType":"json","repeat":"","crontab":"","once":false,"onceDelay":0.1,"showConfirmation":false,"confirmationLabel":"","x":1450,"y":260,"wires":[["2b26f529.49dbfa"]]},{"id":"5a9e7538.2c2fbc","type":"ui_group","z":"","name":"Boundingbox test","tab":"80f0e178.bbf4a","order":2,"disp":true,"width":"12","collapse":false},{"id":"80f0e178.bbf4a","type":"ui_tab","z":"","name":"Home","icon":"dashboard","order":1,"disabled":false,"hidden":false}]
As usual all constructive feedback is very welcome!
E.g. is the list of possibilities ok?
And it would be nice if somebody could offer me some use cases for the readme page, because I cannot think of anything useful for IOT 
Have fun with it!
Bart
