Javascript questions which don't deserve their own thread.

The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > Javascript questions which don't deserve their own thread.

9-Volt Assault: Jan 27, 2007; Beter twee tetten in de hand dan tien op de vlucht.

stoops posted:

I don't know much javascript or jquery. I mean, I can modify and get things to work, but i'm not comfortable writing it from scratch.

Does anyone have any great solid teaching resources? I don't mind paying for video tutorials, or online classes.

I can't seem to find any community college scripting programs, and i figured the net is the best way to go about it.

if any are highly recommended, I'd appreciate.

http://javascriptissexy.com/how-to-learn-javascript-properly

# ¿ Jul 17, 2014 19:57

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# ¿ Apr 29, 2024 11:37

9-Volt Assault: Jan 27, 2007; Beter twee tetten in de hand dan tien op de vlucht.

D3.js question:

If i do:

code:

    <script type="text/javascript">
  var dataset;
  d3.csv("spanish-silver.csv", function(error, data) {
    if (error) {
      console.log(error);
    } else
      {console.log(data);
        dataset = data;
      };

});



d3.select("body").selectAll("p")
    .data(dataset)
    .enter()
    .append("p")
    .text("hail satan!");

</script>

i get an empty page and an error message stating "Uncaught TypeError: Cannot read property 'length' of undefined", however the csv gets loaded based on the console output.

If i wrap the second part in a function and call that function it works, printing a bunch of hail satan paragraphs:

code:

    <script type="text/javascript">
	var dataset;
	d3.csv("spanish-silver.csv", function(data) {
      dataset = data;
      satan(dataset);
 	});



	var satan = function(dataset) {d3.select("body").selectAll("p")
		.data(dataset)
		.enter()
		.append("p")
		.text("hail satan");};

</script>

Why is the second example working, but the first not? Im quite clueless about javascript so i should probably learn more about it. :shobon:

# ¿ Sep 3, 2015 14:37

9-Volt Assault: Jan 27, 2007; Beter twee tetten in de hand dan tien op de vlucht.

i have a simple div:

code:

   
<div id="clock">
<span id="minutes">00</span> : <span id="seconds">00</span>
</div>

and i want to replace the value of the id's minutes and seconds with a variable using jQuery.

If i do

code:

$('#clock').text(workTime)

it works just fine, but replaces everything.

If i do

code:

$('#minutes').text(workTime)

nothing happens.

I also tried using plain javascript, but if i do

code:

document.getElementById("seconds").innerHTML= String(workTime)

i get a "Cannot set property 'innerHTML' of null" error.

Clearly im doing something wrong with the spans, but i cannot figure it out. :confused:

# ¿ Dec 20, 2015 11:07

9-Volt Assault: Jan 27, 2007; Beter twee tetten in de hand dan tien op de vlucht.

Clark Nova posted:

With both jQuery and DOM, it looks like it can't find elements with the IDs "minutes" and "seconds." If you use $.text() or $.html() on a parent, it'll wipe out everything inside it, and you'll have to reload to get them back.

Ah, this explains what is happening. I set an initial time value at the parent level before allowing to change it. If i remove that part it all works like i wanted it to.

Thank you and also Kekekela for looking into it! This wasnt how i would have expected it all to work, so it was a good lesson to learn.

# ¿ Dec 20, 2015 20:17

9-Volt Assault: Jan 27, 2007; Beter twee tetten in de hand dan tien op de vlucht.

Skandranon posted:

Yes, that's a cute answer. I'd then ask you to write out _.isEqual().

Lol if you expect your developers to copy existing functionality for the sake of it.

# ¿ Jun 18, 2017 18:20

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