flot.js - vertically position ticks, with a centered cut-off effect

I am facing an issue with using flot.js for charts that have a timestamp on the x-axis. Due to having numerous ticks on these charts, I decided to rotate them vertically to prevent overlap. While this solution works well, the labels are centered on the tick and get cut off due to insufficient room.

Although there is a tickrotor plugin available at tickrotor, I opted not to use it as it presented more problems than benefits. Instead, I found a plain CSS solution on SO through rotate tick labels. However, the post did not address the specific issue I am encountering (could there be missing information?).

In addition, my project requires IE8 support. The aforementioned post briefly mentions using filter or -ms-filter for this purpose but does not provide the necessary CSS details.

I initially thought that rotating the ticks would adjust the height accordingly, but unfortunately, that is not happening in my case. Even after checking flot's github page, where they mention working on this feature, it has yet to be implemented.

While many people may need to rotate ticks, I have not come across any resources addressing my specific problem of centered and cutoff labels.

Any assistance or suggestions would be greatly appreciated.

#flot_chart div.xAxis div.tickLabel 
{
    transform: rotate(-90deg);
    -ms-transform:rotate(-90deg); /* IE 9 */
    -moz-transform:rotate(-90deg); /* Firefox */
    -webkit-transform:rotate(-90deg); /* Safari and Chrome */
    -o-transform:rotate(-90deg); /* Opera */
    /*rotation-point:50% 50%;*/ /* CSS3 */
    /*rotation:270deg;*/ /* CSS3 */
}

Answer №1

If you attempt to rotate the labels on your own, you may encounter numerous challenges. The existence of flot-tickrotor is a solution to this problem.

Flot adjusts its canvas size within the placeholder div to accommodate enough space for labels. Rotating them through CSS causes two issues: 1.) rotation around the center of the div leading to overlap with the canvas area (hint: shifting down is necessary) and 2.) overflowing the div container (hint: expanding the parent placeholder div is required). The linked example works well because the text is wrapped and similar in size whether rotated or not.

flot-tickrotor addresses these concerns by modifying Flot's low-level code, resizing the canvas to allow for rotated labels (it also eliminates label divs and draws labels using the canvas which aids in older versions of IE).

If you are determined to rotate the labels yourself, examine the plugin's code closely and enjoy recreating its functionality.

EDITS

Here’s an attempt to utilize your CSS and make real-time adjustments for better fit:

// push the labels down half their width
// while we are at it find longest label height
var longest = -1;
$('#flot_chart .xAxis .tickLabel').each(function(){
   var self = $(this);
   var width = self.width();
   self.css('top',parseInt(self.css('top')) + width/2 - 5);
    if (width > longest){
        longest = width;
    }
});

// now adjust the chart height so we don't overflow
$("#flot_chart").height($("#flot_chart").height() + longest - $('#flot_chart .xAxis .tickLabel').height() + 5);

View fiddle demonstration here.

Answer №2

To achieve the desired layout, apply padding bottom and set the position relative to your main container.

Additionally, make sure to assign position absolute to your labels and set the bottom property to 0px.

For example:

.main-container { 
    padding-bottom: 50px; 
    position: relative; 
}

And for the labels:

#flot_chart div.xAxis div.tickLabel  
{
    position: absolute;
    bottom: 0px;
    transform: rotate(-90deg);
    -ms-transform: rotate(-90deg); /* IE 9 */
    -moz-transform: rotate(-90deg); /* Firefox */
    -webkit-transform: rotate(-90deg); /* Safari and Chrome */
    -o-transform: rotate(-90deg); /* Opera */
}

This should address the issue you are experiencing. If not, please share your complete code using Jsfiddle for further assistance.

Answer №3

Although this question has been around for a while, I wanted to share my own experience with it. I encountered the same issue and decided to troubleshoot by trial and error. Eventually, I discovered that lowering the max-width value resolved the problem. Here is the CSS code that helped me fix the issue (in addition to what was mentioned in the original post). The graph I am working with has a maximum height of 300, and the previous setting for max width was 71px.

#flot-placeholder div.xAxis div.tickLabel  {    

    max-width : 30px !important;
    top: 300px !important;

}

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