I am using cytoscape with bezier curves but edges are disappearing when having a node with longer label or just moving source node next to target node.
Video: https://www.screencast.com/t/N2f5eZ5M7
Runnable sample: https://stackblitz.com/edit/web-platform-vpl72r?file=index.html
I have already seen "Edge xxxxx has invalid endpoints and so it is impossible to draw" warning and searched corresponding threads but couldn't find a solution.
Does anyone know how to handle that ?
I see some warnings on the console
The style value of label is deprecated for width
The style value of label is deprecated for height
After I deleted 'width': 'label', 'height':'label', I no longer observe such problem.
--- Update 1.1 ---
but I'd like to have node's dimensions based on label's dimensions.
To do this I think you should write a function style. See the below example. In the example, you can see that we are setting the size of the nodes dynamically based on their name length. I assumed name is a string that stores labels.
cy.style().selector('node').style({
'width': (x) => { return x.data('name').length + 'px;' }
'height': (x) => { return x.data('name').length + 'px;' }
}).update();
I am using Sketch option of vue-color for color picking. It uses v-model to communicate color change as follows:
<sketch-picker v-model="colors" />
where colors is a data initialised as below:
colors: {hex: "#c0392b", a: 1}
When page is loaded color-picker is at expected position i.e. (hex: #c0392b). On changing picker position, colors value changed as expected.
Issue comes when I change colors value in a method like below:
this.colors.hex = "#ff00ff";
this.colors.a = 0.5;
In this case even though data colors value is changed(this is confirmed), color-picker is still pointing at old location i.e. #c0392b.
I don't think this is an expected behavior and possibly a bug. What should be way-around this issue?
Detecting changes in objects is a bit nuanced in Vue/JavaScript. See https://v2.vuejs.org/v2/guide/reactivity.html#Change-Detection-Caveats and the deep option of watch https://v2.vuejs.org/v2/api/#vm-watch
You may simply need to use
this.colors = Object.assign({}, this.colors, { a: 0.5, hex: "#ff00ff" })
We have a dijit.Tree that indicates a node type by using an icon. The icon is a unique indicator that tells the person this node is a "book" or a "DVD" or a "magazine" for example.
dijit renders the icon as a background image in CSS which we know screen readers do not see.
I tried overriding the getTooltip method to provide a tooltip saying "book" or "DVD". It successfully adds the "title" attribute to the "dijitTreeRow". If I mouse over the node, I see the text. This is not ever focused on when the user moves down to get from one node to the next.
When navigating the tree, the up and down arrows traverse the nodes. The span with the visible text is focused on and that string is read. You can see the dotted line focus as well as hear this with JAWS in the most basic of examples: https://dojotoolkit.org/reference-guide/1.10/dijit/Tree.html
What I have not been able to figure out is how to create an indicator that the screen reader will pick up on that will read "Book" alongside "The Great Gatsby".
Does anyone have any tips on how they made this dijit widget accessible for the screen reader when the images are an indicator that should be heard by the blind user?
The tree supports HTML labels, via setting the labelType property on the model you give it.
Assuming you don't want to change the store data (or override the getLabel method), you can reimplement dijit/Tree.getLabel and produce the HTML label, and wrap it with a span with an aria-label.
(code lifted from the dijit.Tree reference).
var myModel = new ObjectStoreModel({
store: myStore,
labelType: "html", // Hack to tell the tree node to render as HTML
query: {id: 'world'}
});
var tree = new Tree({
model: myModel,
getLabel: function(item) {
var label = this.model.getLabel(item);
// dojo.string
return dstring.substitute("<span aria-label='dvd ${0}'>${0}</span>", [label]);
}
});
If your data might contain HTML-ish characters that you don't want to render, escape the characters in getLabel too.
So I'm aware you can use a function to compute a css property in Cytoscape.js e.g.
cytoscape.stylesheet()
.selector('node')
.css({
'width': function(ele) {
return 12;
})
I'm also aware of the special value 'label' that can be the value of the property e.g.
cytoscape.stylesheet()
.selector('node')
.css({
'width': 'label'
})
What I'm wondering is is there any particular property I could use to scale the label by some factor, e.g. what I want is something like
cytoscape.stylesheet()
.selector('node')
.css({
'width': function(ele) {
return labelWidth * 1.5; //Where to get labelWidth from
})
Specially I want the ability to be able to calculate the height and width of an ellipse so that the label is completely contained within the ellipse (which can be computed using some math e.g. Ellipse bounding a rectangle).
But I haven't been able to find a way to get the labelWidth. I did manage to do it using rscratch but only if the node actually got rendered twice (e.g. multiple .selectors), any proper way to get the label width and height from a given element (or at least a way to calculate how it'll be rendered?).
If you want to do more sophisticated sizing, your calculations are going to have to be more sophisticated.
Options :
(1) Calculate the dimensions of the text yourself using a div.
(2) Use the auto sizing, and then adjust the size based on the current size.
(1) is cleaner than (2).
It doesn't make sense for Cytoscape.js to expose rendered calculated values for you in the stylesheet. Those values are calculated from the stylesheet, creating a dependency cycle.
If you just want the label inside your node, you could just set the padding attribute to make more space around the text.
I have an dojo enhanced grid inside a title pane which inturn in Tabcontainer. I am creating a tab container dynamically and painting the title pane which contains grid. For the first time the grid is painted properly but if i close the tab and again try it to open a tabcontainer title pane is painted but grid inside the titlepane is not painted (or rather its not visible) until i do a browser resize.
So anybody have faced similar kind of issue? Please let me know the solution for this.
I tried resize(), update() & startup() methods on grid nothing worked out.
I am kind of stuck please share your thoughts on this.
Thanks,
Vikram
I had the same problem and found a workaround by doing a dojo connect like:
dojo.connect(Datagrid,"_onFetchComplete",DataGrid,"_resize");
So it should automatically be resized, when DataGrid finished loading data.
Hope I could help.
Greeting, Simon
Have you tried setting an absolute height on the Grid?
Which browsers did you try? (I experienced various problems with DataGrid in TabCointainer using IE)
You must call the TabContainer.layout() each time its container is changing size. For doing this, you could 1) monitor DOMEvents onunderflow and onoverflow on containing DOMNode or 2) when container becomes visible (once-n-forall).
Reason why a window.onresize event fixes it is, that the TabContainer hooks on said event and calls its own layout.
In your situation, where the TabController fiddles with TabContainer's panes, there may be missing a 'layoutChildren' somewhere. Optimally, you should place the grid as the first on only child to tab.
After the grid is deployed, it will take an absolute, calculated height - 'inherited' from the TabContainer. This is fired once the TabContainer chooses to resize or instructed to do so.
Manually, you should be able to implement these lines - after re-opening a tab. The script is taken from _Grid.js to illustrate
var grid = dijit.byId('MYGRIDID');
require(["dijit/layout/utils"], function(layerUtils) {
layoutUtils.layoutChildren(grid.domNode,
grid._contentBox,
[grid.tablist, {
domNode: grid.tablistSpacer,
layoutAlign: titleAlign
}, {
domNode: grid.containerNode,
layoutAlign: "client"
}]);
grid._containerContentBox = layoutUtils.marginBox2contentBox(grid.containerNode,
{
domNode: grid.containerNode,
layoutAlign: "client"
});
// note this line in particular
grid.selectedChildWidget.resize(grid._containerContentBox);
}
My issue
I had a similar situation as yours:
Grid is in a titlepane (closed by default).
Grid can be destroyed and re-created on the fly.
Issue appears when user:
opens the pane.
closes the pane.
re-creates the grid.
re-opens the pane.
grid is not visible, until browser window is resized!
My solution
My approach was to force a resize() on my grid whenever the title pane was being opened.
I used code like this, in a place where I had access to both the grid and the panes:
var titlePane = registry.byId("title-pane-id");
var handle = aspect.after(titlePane, "toggle", function(deferred) {
if (titlePane.open) {
grid.resize();
}
});
The dojo/aspect doc
Don't forget to remove the aspect from your grid if you destroy it.
I did this on dojo v1.8.1
My solution is too easy: define on declaration of grid the bold parameter write here:
grid = new EnhancedGrid({id: 'MyIDgrid',
store: dataStore = new ObjectStore({objectStore: myStore}),
structure: structureGrid,
plugins: pluginGrid,
style : 'width: 725px; height: 350px',
autoWidth : true,
**autoHeight : false,height:'200px',**
elasticView : '2'
}, document.createElement('div'));
this resolve all!
Enjoy!
style="height: auto;" will fit the purpose.