如何设置容器的宽度以计算其子容器的宽度

Question

I have a container with n number of div inside it. I need the container to resize according to it children. I know this can be done using jquery library as follows.

JQuery

$(document).ready(function(){
    setContainerWidth();
});

$(window).resize(function(){
   setContainerWidth();
});

function setContainerWidth()
{
    $('.container').css('width', 'auto'); //reset
    var windowWidth = $(document).width();
    var blockWidth = $('.block').outerWidth(true);
    var maxBoxPerRow = Math.floor(windowWidth / blockWidth);
    $('.container').width(maxBoxPerRow * blockWidth);
}

This time I need to do this with the pure javascript for some plugin issue. I broke down the code till as follows and stuck in the middle any help would be appreciated.

Javascript

function setContainerWidth(){
    var container_width = document.getElementById('container').offsetWidth;
    var width = document.body.clientWidth
    var block_width = document.getElementsByClassName("block").offsetWidth;

    container.style.width = "auto"
    var maxBoxPerRow = Math.floor(width / block_width)
    container.offsetWidth(maxBoxPerRow * block_width)
}

Example one using jquery

Example two using javascript

Answer 1

You are missing a few things from your pure javascript translation:

function setContainerWidth()
{
    var container = document.getElementById('container');
    container.style.width = "auto";
    var window_width = window.innerWidth;
    var block_width = document.getElementsByClassName("block")[0].offsetWidth;
    var maxBoxPerRow = Math.floor(window_width / block_width);
    container.style.width = (maxBoxPerRow * block_width) + 'px';
}