Is there a way to determine the width of elements located before an element when it is hovered over?
I attempted to achieve this using the following code:
$('ul li').hover(function() {
$(this).prevAll().each(function() {
var margin = $(this).width();
});
$(this).css('margin-left', margin + 'px');
});
However, the console displays the error message:
Uncaught ReferenceError: margin is not defined
Does anyone have a solution for this issue? Thank you.
I'm trying to find a method to determine the total width of elements before a specific element when hovering over it.
To achieve this, ensure you declare your variable outside of the loop and accumulate the values:
$('ul li').hover(function() {
var sumWidth = 0;
$(this).prevAll().each(function() {
sumWidth += $(this).width();
});
$(this).css('margin-left', sumWidth + 'px');
});
In order to avoid accessing the margin variable outside of each function and receiving an undefined result, it is important to store the variable outside of the each function scope so that it can be accessed globally:
$('ul li').hover(function() {
var margin;
$(this).prevAll().each(function() {
margin = $(this).width();
});
$(this).css('margin-left', margin + 'px');
});
If the goal is to ensure that the list margin-left is set correctly, a slight modification can be made as shown below:
$('ul li').hover(function() {
var $this = $(this);//'li'
$(this).prevAll().each(function() {
var margin = $(this).width();
$this.css('margin-left', margin + 'px');//margin on 'li'
});
});
It is important to remember that the margin variable can only be accessed within the specific scope in which it was defined or assigned a value.
$('ul li').on('mouseover', function() {
var selected = this;
$(selected).prevAll().each(function() {
var space = $(this).width();
$(this).css('margin-left', space + 'px');
});
});
Make sure to set the margin within the loop where the margin variable is established. When a variable is declared in a function/loop, its 'scope' is restricted to that specific function/loop.
$('ul li').hover(function() {
$(this).prevAll().each(function() {
var margin = $(this).width();
$(this).css('margin-left', margin + 'px');
});
});
If you need to access the margin value outside the loop, you must define it beforehand like so:
$('ul li').hover(function() {
var margin = 0;
$(this).prevAll().each(function() {
margin = $(this).width();
});
$(this).css('margin-left', margin + 'px');
});
To have a global scope for the margin variable, declare it before any other actions:
var margin = 0;
$('ul li').hover(function() {
$(this).prevAll().each(function() {
margin = $(this).width();
});
$(this).css('margin-left', margin + 'px');
});
//Now, the margin can be utilized here as well.
The initial solution should suit your current needs, but I've provided the alternate approach just in case you encounter similar situations in the future.
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