How to get the grid coordinates of an element using JavaScript?

问题

Let's say I have a 3-column CSS-Grid. Is there a way, using JavaScript, to get the grid-row and grid-column of an auto-placed element?

Example:

console.log($('#test').css('grid-row'), $('#test').css('grid-column'));
// expected output: 2 3 
// actual output: two empty strings

.grid {
  display: grid;
  grid-template-columns: repeat( 3, 1fr);
}

<div class="grid">
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div id="test"></div>
  <div></div>
  <div></div>
  <div></div>
</div>

Here is a JSFiddle of the example: https://jsfiddle.net/w4u87d2f/7/

In this example I could figure it out by counting the elements and knowing the grid has three columns:

grid-column = $('#test').index() % 3 + 1;
grid-row = Math.ceil( $('#test').index() / 3 )

But that only works for very simple grids and also means I have to consider breakpoints that change the number of columns.

Edit: This is not a duplicate of Retrieve the position (X,Y) of an HTML element, as I'm not interested in pixel coordinates but the row and column number within the CSS-Grid.

回答1:

//Add click event for any child div of div = grid
$(document).ready(function(){
    $('.grid').on('click', 'div', function(e){
          GetGridElementsPosition($(this).index()); //Pass in the index of the clicked div
    //Relevant to its siblings, in other words if this is the 5th div in the div = grid
    });
});

function GetGridElementsPosition(index){
    //Get the css attribute grid-template-columns from the css of class grid
    //split on whitespace and get the length, this will give you how many columns
    const colCount = $('.grid').css('grid-template-columns').split(' ').length;

    const rowPosition = Math.floor(index / colCount);
    const colPosition = index % colCount;

    //Return an object with properties row and column
    return { row: rowPosition, column: colPosition } ;
}

来源：https://stackoverflow.com/questions/51327802/how-to-get-the-grid-coordinates-of-an-element-using-javascript

标签

javascript

jquery

css

css3

css-grid