queue.js | 易学教程

Trying to load simple CSV file into D3 with queue.js

阅读更多关于 Trying to load simple CSV file into D3 with queue.js

问题 I'm a newbie to web dev, and am trying to figure out how to load CSV data into D3.js, using queue.js to ensure that data is fully loaded before I execute the next step of the code (which will be drawing a chart with the data). I have googled this endlessly, but can't seem to wrap my head around how queue.js works. I have the following code, and can't understand why it isn't working. //Create a queue. First load CSV data, then run a function on the data once fully loaded. queue() .defer(d3.csv

Queue error “Uncaught TypeError: Cannot read property 'objects' of null”

阅读更多关于 Queue error “Uncaught TypeError: Cannot read property 'objects' of null”

问题 I'm trying to using queues to ensure my files are loaded fully before the script continues. However, when I load in my json map files and try to use them in a function, I get an error. var counties = svg.append("g") .attr("id", "counties") .attr("class", "Blues"); var states = svg.append("g") .attr("id", "states"); queue() .defer(d3.json, "county.json") .defer(d3.json, "state.json") .defer(d3.json, "Crashes.json") .await(ready); function ready(county, state, crashes) { var countyFeatures =

Difference between queue.await() and queue.awaitAll()

阅读更多关于 Difference between queue.await() and queue.awaitAll()

问题 I'm new to D3 & JavaScript . I'm trying to understand queue.js in that. I've gone through this link. But still can't get a clear cut idea about the difference between queue.await() and queue.awaitAll() . Can anyone help me with an example(if possible)? 回答1: From the documentation you've linked to: If await is used, each result is passed as an additional separate argument; if awaitAll is used, the entire array of results is passed as the second argument to the callback. So the difference is

Trying to add an XHR to Queue.js to show progress

阅读更多关于 Trying to add an XHR to Queue.js to show progress

问题 I am trying to add a progress meter to my files by following this code: Progress Events I have an XHR with progress working fine like so: d3.csv("data/WLAN2.csv") .on("progress", function() { var i = d3.interpolate(progress, d3.event.loaded / d3.event.total); d3.transition().tween("progress", function() { return function(t) { progress = i(t); foreground.attr("d", arc.endAngle(twoPi * progress)); text.text(formatPercent(progress)); }; }); }) .get(function(error, data) { meter.transition()

Queue.js to preload images is waiting forever? (Callback)

阅读更多关于 Queue.js to preload images is waiting forever? (Callback)

问题 I'm using mbostock queue.js script to load several json files, by doing something like that: var q = queue() .defer(d3.json, "world-110m.json") .defer(d3.tsv, "world-country-names.tsv") .await(ready); where ready is the function to execute when everythin is loaded. I would like to preload an image by adding a defer. Is this possible? I have tried it several ways, but it doesn't work. I suppose that a function must be created, but I can't make it asynchronous, and the queue keeps waiting

Queue.js to preload images is waiting forever? (Callback)

阅读更多关于 Queue.js to preload images is waiting forever? (Callback)

I'm using mbostock queue.js script to load several json files, by doing something like that: var q = queue() .defer(d3.json, "world-110m.json") .defer(d3.tsv, "world-country-names.tsv") .await(ready); where ready is the function to execute when everythin is loaded. I would like to preload an image by adding a defer. Is this possible? I have tried it several ways, but it doesn't work. I suppose that a function must be created, but I can't make it asynchronous, and the queue keeps waiting forever... explunit Here is what queue.js is expecting from the callbacks : The callbacks follow the Node.js