My d3.js Scales are not working

Question

I am new to d3.js and is currently making a simple bar chart in version 4. I understand the basic idea of a scale. The problem is whenever I reload my page, some of my bars on my bar chart are cut in half, or is moved all the way to the top(or bottom) this is my code. I want my bars to stay within the svg but if i were to put for example

.attr(height, function(d){ return yScale(d)]); 

It wont work. Any ideas? my code should be located on the bottom.

var data = [ 40,60,80,100,600,700];
var height = 500, width = 500;  


var canvas  = d3.select("body")
            .append("svg")
            .attr("width", width)
            .attr("height",height);


var yScale = d3.scaleLinear()
           .domain([40, 700])
           .range([0,400]);


var bars = canvas.selectAll("rect")
             .data(data)
             .enter()
             .append("rect")
                .attr("width", 30)
                .attr("height", function(d){ return   yScale(d)})

                .attr("x", function(d,i){ return i * 35})
                .attr("y", function(d) { return height - d});



}

Output of image is here.

Answer 1

The problem here is this line:

.attr("y", function(d) {
    return height - d
});

Why are you using the raw data value? You have to use the value returned by the scale:

.attr("y", function(d) {
    return height - yScale(d)
});

Here is the updated code:

 var data = [40, 60, 80, 100, 600, 700]; var height = 500, width = 500; var canvas = d3.select("body") .append("svg") .attr("width", width) .attr("height", height); var yScale = d3.scaleLinear() .domain([40, 700]) .range([0, 400]); var bars = canvas.selectAll("rect") .data(data) .enter() .append("rect") .attr("width", 30) .attr("height", function(d) { return yScale(d) }) .attr("x", function(d, i) { return i * 35 }) .attr("y", function(d) { return height - yScale(d) }); 

 <script src="https://d3js.org/d3.v4.min.js"></script>