Resize on div element

Question

jQuery has the resize() - event, but it just work with window.

jQuery(window).resize(function() { /* What ever */ });

This wor

Answer 1

Just try this func (it may work not only for divs):

function resized(elem, func = function(){}, args = []){
    elem = jQuery(elem);
    func = func.bind(elem);
    var h = -1, w = -1;
    setInterval(function(){
        if (elem.height() != h || elem.width() != w){
            h = elem.height();
            w = elem.width();
            func.apply(null, args);
        }
    }, 100);
}

You can use it like this

resized(/*element*/ '.advs-columns-main > div > div', /*callback*/ function(a){
    console.log(a);
    console.log(this); //for accessing the jQuery element you passed
}, /*callback arguments in array*/ ['I\'m the first arg named "a"!']);

UPDATE: You can also use more progressive watcher (it can work for any objects, not only DOM elements):

function changed(elem, propsToBeChanged, func = function(){}, args = [], interval = 100){
        func = func.bind(elem);
        var currentVal = {call: {}, std: {}};
        $.each(propsToBeChanged, (property, needCall)=>{
            needCall = needCall ? 'call' : 'std';
            currentVal[needCall][property] = new Boolean(); // is a minimal and unique value, its equivalent comparsion with each other will always return false
        });
        setInterval(function(){
            $.each(propsToBeChanged, (property, needCall)=>{
                try{
                    var currVal = needCall ? elem[property]() : elem[property];
                } catch (e){ // elem[property] is not a function anymore
                    var currVal = elem[property];
                    needCall = false;
                    propsToBeChanged[property] = false;
                }
                needCall = needCall ? 'call' : 'std';
                if (currVal !== currentVal[needCall][property]){
                    currentVal[needCall][property] = currVal;
                    func.apply(null, args);
                }
            });
        }, interval);
    }

Just try it:

var b = '2',
    a = {foo: 'bar', ext: ()=>{return b}};
changed(a, {
// prop name || do eval like a function?
    foo:        false,
    ext:        true
}, ()=>{console.log('changed')})

It will log 'changed' every time when you change b, a.foo or a.ext directly

Answer 2

I was only interested for a trigger when a width of an element was changed (I don' care about height), so I created a jquery event that does exactly that, using an invisible iframe element.

$.event.special.widthChanged = {
  remove: function() {
      $(this).children('iframe.width-changed').remove();
  },
  add: function () {
      var elm = $(this);
      var iframe = elm.children('iframe.width-changed');
      if (!iframe.length) {
          iframe = $('<iframe/>').addClass('width-changed').prependTo(this);
      }
      var oldWidth = elm.width();
      function elmResized() {
          var width = elm.width();
          if (oldWidth != width) {
              elm.trigger('widthChanged', [width, oldWidth]);
              oldWidth = width;
          }
      }

      var timer = 0;
      var ielm = iframe[0];
      (ielm.contentWindow || ielm).onresize = function() {
          clearTimeout(timer);
          timer = setTimeout(elmResized, 20);
      };
  }
}

It requires the following css :

iframe.width-changed {
    width: 100%;
    display: block;
    border: 0;
    height: 0;
    margin: 0;
}

You can see it in action here widthChanged fiddle

Answer 3

// this is a Jquery plugin function that fires an event when the size of an element is changed
// usage: $().sizeChanged(function(){})

(function ($) {

$.fn.sizeChanged = function (handleFunction) {
    var element = this;
    var lastWidth = element.width();
    var lastHeight = element.height();

    setInterval(function () {
        if (lastWidth === element.width()&&lastHeight === element.height())
            return;
        if (typeof (handleFunction) == 'function') {
            handleFunction({ width: lastWidth, height: lastHeight },
                           { width: element.width(), height: element.height() });
            lastWidth = element.width();
            lastHeight = element.height();
        }
    }, 100);


    return element;
};

}(jQuery));

Answer 4

what about this:

divH = divW = 0;
jQuery(document).ready(function(){
    divW = jQuery("div").width();
    divH = jQuery("div").height();
});
function checkResize(){
    var w = jQuery("div").width();
    var h = jQuery("div").height();
    if (w != divW || h != divH) {
        /*what ever*/
        divH = h;
        divW = w;
    }
}
jQuery(window).resize(checkResize);
var timer = setInterval(checkResize, 1000);

BTW I suggest you to add an id to the div and change the $("div") to $("#yourid"), it's gonna be faster, and it won't break when later you add other divs

Answer 5

If you just want to resize the div itself you need to specify that in css style. You need to add overflow and resize property.

Below is my code snippet

#div1 {
        width: 90%;
        height: 350px;
        padding: 10px;
        border: 1px solid #aaaaaa;
        overflow: auto;
        resize: both;
    }

<div id="div1">

</div>