Show the tooltip above the cursor if there is enough space in the viewport; otherwise, position it

Question

Show the tooltip above the cursor if there is enough space in the viewport; otherwise, position it

I'm encountering an issue with positioning a tooltip that I'm creating.

The tooltip's CSS is set to position: absolute, and I've implemented a mouse event handler that adjusts its top and left based on the pageX and pageY.

While I could simply set the top as pageY and left as pageX, this would cause the tooltip to always appear at the bottom-right. My goal is to have it show up at the top-right if space allows, or fallback to the bottom-right position if it goes beyond the viewport on the Y-axis.

Currently, I'm struggling to figure out how to display the tooltip at the top-right of the mouse cursor. I'm unsure where to start in terms of detecting if it would be within the viewport. Can anyone provide guidance?

$('p').on('mouseenter', function(e) {
    $(tt).css('top', e.pageY - $(tt).css('height'));
    $(tt).css('left', e.pageX);
    $(tt).appendTo('body');
}).on('mousemove', function(e) {
    $(tt).css('top', e.pageY - $(tt).css('height'));
    $(tt).css('left', e.pageX);    
}).on('mouseleave', function(e) {
    $(tt).detach();
});

Check out the example on JSFiddle

javascript jquery css

Answer 1

Answer №1

When it comes to working with tooltips, especially in conjunction with jQuery, there are various approaches you can take. The method outlined here may not be the most intuitive choice for some, but with a few adjustments, it can function as intended.

var tt = document.createElement('div');
tt.id = "tt";

$('p').on('mouseenter', function(e) {
    var curPos = $( this ).offset().top - $( window ).scrollTop();
    var inView = (curPos < 250) ? 0 : 250;
    $(tt).css('top', e.pageY - inView);
    $(tt).css('left', e.pageX);
    $(tt).append($( this ).attr("data-myId"));
    $(tt).appendTo('body');
}).on('mousemove', function(e) {
    $(tt).css('top', e.pageY - $(tt).css('height'));
    $(tt).css('left', e.pageX);    
}).on('mouseleave', function(e) {
    $(tt).empty($( this ).attr("data-myId"));
    $(tt).detach();
});

You can view the complete changes on JSFiddle.

This implementation takes advantage of jQuery's offset() and scrollTop() functions to determine the position of an element within the visible part of the page.

jQuery's API documentation explains that the .offset() method retrieves the current position of an element relative to the document. It also mentions that the vertical scroll position (.scrollTop()) reflects the number of hidden pixels above the visible area.

We leverage these functions by subtracting the number of hidden pixels from the element's position relative to the document. It's important to note that the offset method returns an object with top and left properties.

var curPos = $( this ).offset().top - $( window ).scrollTop();

With the tooltip height set at a fixed 250px, we can determine whether the element is positioned within the window's visible area by comparing its location. If it's below 250px, no adjustments are made, keeping the tooltip beneath the cursor. If it exceeds 250px, we subtract 250px to place the tooltip above the cursor.

The content for the tooltips can be derived from the data-myId value using

$(tt).append($( this ).attr("data-myId"));

, while

$(tt).empty($( this ).attr("data-myId"));

clears it on mouseleave. I hope this explanation clarifies things!

Answer 2

When it comes to working with tooltips, especially in conjunction with jQuery, there are various approaches you can take. The method outlined here may not be the most intuitive choice for some, but with a few adjustments, it can function as intended.

var tt = document.createElement('div');
tt.id = "tt";

$('p').on('mouseenter', function(e) {
    var curPos = $( this ).offset().top - $( window ).scrollTop();
    var inView = (curPos < 250) ? 0 : 250;
    $(tt).css('top', e.pageY - inView);
    $(tt).css('left', e.pageX);
    $(tt).append($( this ).attr("data-myId"));
    $(tt).appendTo('body');
}).on('mousemove', function(e) {
    $(tt).css('top', e.pageY - $(tt).css('height'));
    $(tt).css('left', e.pageX);    
}).on('mouseleave', function(e) {
    $(tt).empty($( this ).attr("data-myId"));
    $(tt).detach();
});

You can view the complete changes on JSFiddle.

This implementation takes advantage of jQuery's offset() and scrollTop() functions to determine the position of an element within the visible part of the page.

jQuery's API documentation explains that the .offset() method retrieves the current position of an element relative to the document. It also mentions that the vertical scroll position (.scrollTop()) reflects the number of hidden pixels above the visible area.

We leverage these functions by subtracting the number of hidden pixels from the element's position relative to the document. It's important to note that the offset method returns an object with top and left properties.

var curPos = $( this ).offset().top - $( window ).scrollTop();

With the tooltip height set at a fixed 250px, we can determine whether the element is positioned within the window's visible area by comparing its location. If it's below 250px, no adjustments are made, keeping the tooltip beneath the cursor. If it exceeds 250px, we subtract 250px to place the tooltip above the cursor.

The content for the tooltips can be derived from the data-myId value using

$(tt).append($( this ).attr("data-myId"));

, while

$(tt).empty($( this ).attr("data-myId"));

clears it on mouseleave. I hope this explanation clarifies things!

Show the tooltip above the cursor if there is enough space in the viewport; otherwise, position it

Answer №1

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