Bar Graph is generated on Web Page (developed using AngularJS) using data from database. Graph is created using CANVAS.
Once graph is completed loaded, if you click on Red part, it will open one pop-up which will have table containing the values - Total and Missed. Same for Green - Total & Hit.
Graph will always have two colors - RED & GREEN.
I am trying to test this Graph using Robot Framework.
I am able to Click on graph and then read the value from popup table.
Only issue is I am clicking randomly. I want to identify the RED and GREEN and then Click it.
After inspecting above element in IE, below information I am getting for above Graph.
<div class = 'ChartWrapperArea'>
<canvas width='2000' height='600'
class = 'chart-bar ng-isolate-scope'
id = 'pwFeedChart' style='display;block;'
chart-colors='colors' chart-options='barOptions'
chart-labels='barLabels' chart-data='barData'
chart='pwFeedChart'>
</canvas>
</div>
Please let me know the way how to identify the element in graph.
Preferable option is Robot Framework but ready for any other solution also.
You can get the coordinates of canvas using offsetLeft, offsetTop, width of the canvas. Ex.
var test = document.getElementsByTagName('canvas')[0];
var left = test.offsetLeft;
var top = test.offsetTop;
var width = test.width;
// get the coordinates X and Y using above.
After that you can use jquery to click in that area below is the sample link for it.
How to simulate a click by using x,y coordinates in JavaScript?.
Hope it helps.
Related
I'm trying to create a matrix of canvases which each would be the size of the device-width and device-height. The idea is to have this matrix from where the view would move from canvas to canvas by pressing a button. So basically you would only see one canvas at a time, and others would locate up/down and left/right out of the screen.
I'm really new to javascript and webdesign so I'm not sure if the canvas element is the best way to do this at all. I don't have any code to show because I just started this project and wanted to ask first to get it right from the begining.
Is the approach of multiple canvases a good way to go or what would be better option and how to do it?
Thanks!
This is a small start to get you started with how you can make canvas elements dynamically. You should look at W3 Schools for reference on how to edit DOM elements. Create element in the DOM.
window.onload = function() {
var canvasElements = [];
var canvas1 = document.createElement("canvas");
canvas1.id = "canvas1";
canvasElements.push(canvas1);
}
What you want in your solution
1) Make a CSS class with full width and height of the page.
2) Add canvas elements dynamically to the page using JavaScript and DOM manipulation.
3) For each canvas, add it to the DOM, and do the logic you want with it (render elements and draw circles / images whatnot). This will require a lot of JavaScript, so I would suggest you start out simple with a single canvas.
I hope that gets you going.
I am creating a rectangle element in raphael JS as a tooltip on an SVG circle element generated by raphael JS. I am unable to access the coordinates of the center of the circle (which I need to place the rectangle tooltip) using the following code in Internet Explorer..
var c = {};
c.x = parseInt(c_element.node.attributes[0].nodeValue);
c.y = parseInt(c_element.node.attributes[1].nodeValue);
//code for the rectangle element tooltip
r = paper.rect(c.x,c.y,50,50);
Its working fine in Firefox.. But in IE, the tooltip gets created at the upper left corner of the div enclosing my raphael JS paper and not on the center o the circle as desired..
How do I solve this cross-browser issue? Please help..
I don't know for certain why IE doesn't like this, but there's a much easier way:
c.x = c_element.attr("cx");
c.y = c_element.attr("cy");
jsFiddle
If you log the Raphael object to the console, you can check out the "attrs" property to see what's in there. Different for every type of Raphael object.
While we're all here: I highly recommend using an absolutely positioned div for your tooltips. HTML handles things like wrapping text and resizing the tooltip to accomodate different amounts of text much more easily than the SVG text element. See this answer. (Whatever you use, you'll still need to access the coordinates of the circle.)
I am not sure how to do this. Can it be done? How can it be done eligently? And hopefully can it be done without the need for another plugin library (jquery is ok) - I am trying to cut down the number of js files.
I have a canvas with a map in it. The user can click on the map. Then I want a white square to appear near to where the user clicked (rounded corners and a black border) with a few options on it for the user to select one. These can be text options, eg 'Country Summary', 'GDP', etc. Then the user selects one and the info appears in a area to the left, and the white option square automatically disappears.
Is this possible? Can it be done without the need for a window with a blue bar at the top and all the other window baggage?
Hope someone can help.
Jon
Yes, it can be done. You don't have to do it in the canvas, you can use regular HTML for that part.
Just add a new element to the page with the following CSS properties
position:absolute;
display:inline;
(as well as some CSS for rounded corners and black borders)
and then set its X and Y properties to the X and Y mouse coordinates of the event.
Then work with that element as you would with anything else.
I'm working on a script to do several things. In a nutshell, here's what it needs to do:
Read the coordinates from a page and be able to pop up a box within a specific region.
The pop up box needs to be able to follow the mouse around.
I need to be able to modify the box to look however I want (I was thinking a div container that is set to display:hidden, and then the JS sets the display to block when your mouse is in the specified region).
I need to be able to modify it easily (aka, add and subtract objects and coordinate sets)
I was originally using HTML maps (), and that worked great, until I resized my browser, and the div that I had following the mouse no longer lined up correctly. Something about the offset not working correctly, and I couldn't get it to work correctly, so I switched to an HTML canvas.
And now I've got the coordinates in the canvas correctly, I just can't figure out how to get something to pop up when the mouse is inside of a certain section. Here's my current code:
function drawLines(numbers, color){
//poly [x,y, x,y, x,y.....];
var poly=numbers;
context.fillStyle = color;
context.beginPath();
context.moveTo(poly[0], poly[1]);
for( item=2 ; item < poly.length-1 ; item+=2 )
{context.lineTo( poly[item] , poly[item+1] )};
context.closePath();
context.fill();
}
I've got each region inside of an array, which I then pass to the function one by one. The color was a test, and I can easily get each region to show up as a specified color, but that doesn't solve my problem. Any ideas? Thanks!
Seems strange to jump to canvas over a style issue, but ignoring that...
You could bind mousemove events on the canvas element and then do hit tests on your region to see if the mouse is inside the region.
Doing the hit test efficiently might be tricky depending on the number of regions your testing, but it's definitely doable.
The canvas is just like any other block level element, so the same events apply and are bound in the same way.
Here's one example of mouse events interacting with canvas. In this example, the events are bound to the document, but similar ideas apply.
http://dev.opera.com/articles/view/blob-sallad-canvas-tag-and-javascrip/
Is there any trick to determine if user clicks on given element rendered in canvas? For example I'm displaying rhombus from .png file with transparent background and i want to know if user click inside or outside that figure (like mouse-element collision).
There is no concept of individual elements in a canvas - it is simply just an area that you're drawing pixels onto. SVG on the other hand is made up of elements which you can then bind events to. However there are a few approaches you can take to add click events to canvas:
Position an html element that overlays the area on the canvas you want to be clickable. A for a rectangular area or an image map for something more irregular.
Use separate canvases for each element that you want to be clickable.
CAKE - I haven't used this myself, but it's description is "SVG sans the XML". This may cover your needs. Demos here http://glimr.rubyforge.org/cake/canvas.html#EditableCurve
One idea is to draw the image to a temporary canvas, then use getImageDate() to receive data for the pixel you are interested in, and check if its alpha value is 0 ( = transparent).
The following is a sketch of a solution. It is assumed that...
x and y are the coordinates of the mouse click event
you are looping over gameObjects, the current object being stored in the variable gameObject
the game object has been initialized with an image, x and y coordinates
The following code would then check whether the click was on a transparent area:
var tempCanvas = document.createElement('canvas');
if (tempCanvas.getContext) {
tempContext = tempCanvas.getContext('2d');
}
tempContext.drawImage(gameObject.img, 0, 0);
var imgd = tempContext.getImageData(x - gameObject.x, y - gameObject.y, 1, 1);
var pix = imgd.data;
if (pix[3] == 0) {
// user clicked on transparent part of the image!
}
Note: This is probably quite inefficient. I'm sure someone can come up with a better solution.
I have solve this problem using kintech.js, tutorials and examples can be found: http://www.html5canvastutorials.com/kineticjs/html5-canvas-drag-and-drop-tutorial/