Plotly js: how to run my javascript ONLY after loading image image

Question

When using any type of graphical graph with the Javascript API (plotly.js, not plotly-nodejs), how can I run some javascript ONLY after loading the graph? I am looking for a mechanism in the javascript graphics API that, for example, does the same thing as "addListenerOnce", combined with "patchloaded" or "ready", when using the Google Maps API.

For example, let's say I just want to display a warning immediately after rendering the example shown at https://plot.ly/~PlotBot/685 , for which the html and js code can be seen at https://plot.ly/~PlotBot/ 685.js.

There are many reasons for this, but the one I came across now uses wkhtml2pdf, which has to wait for the page to display before displaying it (see wkhtmltopdf javascript delay ) (Yes, I know I can use -javascript-delay with wkhtml2pdf but hard code a fixed amount of time and hope that your program will wait long enough for its next steps to be successful, and not the solution I'm looking for - and, moreover, this approach is specific to wkhtml2pdf and does not answer the general question) .

Prefer a browser-independent solution, but at least you need it to work in Chrome

Answer 1

Using a promise, as mentioned in the comments above, is the right solution. However, the promise is triggered before the first animation frame is rendered. As a workaround, you can sign up for a promise, and then wait for the end of the animation frame using requestAnimationFrame .

EDIT: For Firefox, a single frame of animation is enough, but not Chrome. Therefore, I am editing the use of a pair of animation frames, which seems to fix the problem in Chrome, and should continue to work in Firefox. This, of course, is just a workaround for the problem in Plotly, as the promise should not be resolved until the plot is made.

Here is an example:

 var trace1 = { z: [[8.83, 8.89, 8.81, 8.87, 8.9, 8.87], [8.89, 8.94, 8.85, 8.94, 8.96, 8.92], [8.84, 8.9, 8.82, 8.92, 8.93, 8.91], [8.79, 8.85, 8.79, 8.9, 8.94, 8.92], [8.79, 8.88, 8.81, 8.9, 8.95, 8.92], [8.8, 8.82, 8.78, 8.91, 8.94, 8.92], [8.75, 8.78, 8.77, 8.91, 8.95, 8.92], [8.8, 8.8, 8.77, 8.91, 8.95, 8.94], [8.74, 8.81, 8.76, 8.93, 8.98, 8.99], [8.89, 8.99, 8.92, 9.1, 9.13, 9.11], [8.97, 8.97, 8.91, 9.09, 9.11, 9.11], [9.04, 9.08, 9.05, 9.25, 9.28, 9.27], [9, 9.01, 9, 9.2, 9.23, 9.2], [8.99, 8.99, 8.98, 9.18, 9.2, 9.19], [8.93, 8.97, 8.97, 9.18, 9.2, 9.18]], colorbar: { xpad: 0, ypad: 0 }, showscale: false, type: "surface", uid: "3f95e8", zmax: 9.28, zmin: 8.74 }; var trace2 = { z: [[9.83, 9.89, 9.81, 9.87, 9.9, 9.87], [9.89, 9.94, 9.85, 9.94, 9.96, 9.92], [9.84, 9.9, 9.82, 9.92, 9.93, 9.91], [9.79, 9.85, 9.79, 9.9, 9.94, 9.92], [9.79, 9.88, 9.81, 9.9, 9.95, 9.92], [9.8, 9.82, 9.78, 9.91, 9.94, 9.92], [9.75, 9.78, 9.77, 9.91, 9.95, 9.92], [9.8, 9.8, 9.77, 9.91, 9.95, 9.94], [9.74, 9.81, 9.76, 9.93, 9.98, 9.99], [9.89, 9.99, 9.92, 10.1, 10.13, 10.11], [9.97, 9.97, 9.91, 10.09, 10.11, 10.11], [10.04, 10.08, 10.05, 10.25, 10.28, 10.27], [10, 10.01, 10, 10.2, 10.23, 10.2], [9.99, 9.99, 9.98, 10.18, 10.2, 10.19], [9.93, 9.97, 9.97, 10.18, 10.2, 10.18]], opacity: 0.9, showscale: false, type: "surface", uid: "443a24", zmax: 10.28, zmin: 9.74 }; var trace3 = { z: [[7.83, 7.89, 7.81, 7.87, 7.9, 7.87], [7.89, 7.94, 7.85, 7.94, 7.96, 7.92], [7.84, 7.9, 7.82, 7.92, 7.93, 7.91], [7.79, 7.85, 7.79, 7.9, 7.94, 7.92], [7.79, 7.88, 7.81, 7.9, 7.95, 7.92], [7.8, 7.82, 7.78, 7.91, 7.94, 7.92], [7.75, 7.78, 7.77, 7.91, 7.95, 7.92], [7.8, 7.8, 7.77, 7.91, 7.95, 7.94], [7.74, 7.81, 7.76, 7.93, 7.98, 7.99], [7.89, 7.99, 7.92, 8.1, 8.13, 8.11], [7.97, 7.97, 7.91, 8.09, 8.11, 8.11], [8.04, 8.08, 8.05, 8.25, 8.28, 8.27], [8, 8.01, 8, 8.2, 8.23, 8.2], [7.99, 7.99, 7.98, 8.18, 8.2, 8.19], [7.93, 7.97, 7.97, 8.18, 8.2, 8.18]], opacity: 0.9, showscale: false, type: "surface", uid: "47cf99", zmax: 8.28, zmin: 7.74 }; var data = [trace1, trace2, trace3]; var layout = { autosize: false, height: 200, margin: { r: 0, t: 0, autoexpand: false, b: 0, l: 0 }, scene: { aspectmode: "manual", aspectratio: { x: 1, y: 1, z: 1 }, camera: { center: { x: 0, y: 0, z: 0 }, eye: { x: 1.59999582495, y: 1.57131061558, z: 0.970117065684 }, up: { x: 0, y: 0, z: 1 } } }, width: 650 }; Plotly.plot('plotly-div', data, layout).then(function() { window.requestAnimationFrame(function() { window.requestAnimationFrame(function() { window.alert('Your plot is done.'); }); }); }); 

 <script src="https://cdn.plot.ly/plotly-latest.min.js"></script> <div id="plotly-div"></div> 

Answer 2

on this page: https://plot.ly/javascript/getting-started/ under

Start building!

You will be asked to create a div with id .

By adding onload as attribute (or in javascript)

You will get the following: <div id="tester" onload="myFunction()" style="width:600px;height:250px;"></div>

"myFunction" may contain the code that you want to execute after loading the image.

http://www.w3schools.com/jsref/event_onload.asp