Determine whether the child element extends beyond the boundaries of the parent element

Question

Determine whether the child element extends beyond the boundaries of the parent element

I am currently working on determining whether a child element is visible within its parent element. To achieve this, I am comparing the width of the parent element to the position of the child element using position().left.

Given that I have multiple distinct parent and child elements, I am utilizing each functions.

//Iterating over each p element in the Instagram feed
jQuery('#instagram-feed .meta-data p').each(function(){

    // Storing the width of this p element
    var parentWidth = jQuery(this).width();

    // Iterating over each a element within this p
    jQuery(this).children('a').each(function(){

        // Comparing the width of the p element with the position of this a element
        if(parentWidth < jQuery(this).position().left) {

            // Changing text color to green if position exceeds width
            jQuery(this).css('color', 'green');
            console.log("Not inside element");

        } else {

            // Changing text color to red if position is within width
            jQuery(this).css('color', 'red');
            console.log("Inside element");
        }

        console.log(jQuery(this).position().left);

    });

});

I've created a fiddle for you to visualize and test: http://jsfiddle.net/fprm7mgd/9/ (Ensure the three elements are positioned horizontally to observe the "bug")

https://i.stack.imgur.com/Ah9c2.png

The issue arises in the third parent element where it appears that position().left is calculated from the first or higher-level parent element. Why does the link in the third parent turn green? It should be red since it's contained within the parent... What mistake have I made?

jquery css

Answer 1

Answer №1

To determine the left position of the a element within its parent using jQuery, you can utilize the following code snippet:

// For every p in the Instagram feed
jQuery('#instagram-feed .meta-data p').each(function(){

    // Obtain the width of this p element
    var parentWidth = jQuery(this).width();
    var parent = jQuery(this);

    // Iterate through each a element within this p
    jQuery(this).children('a').each(function(){

        var elementLeft = jQuery(this).position().left - parent.position().left;
        
        // Compare the width of the p element with the position of this a element
        if(parentWidth < elementLeft) {

            // If the position is greater than the width
            jQuery(this).css('color', 'green');
            console.log("Not inside element");

        } else {

            // If the position is smaller than the width
            jQuery(this).css('color', 'red');
            console.log("Inside element");
        }

        // Additional logic here...

    });

});

View the demonstration on JSFiddle: http://jsfiddle.net/fprm7mgd/29/

Answer 2

To determine the left position of the a element within its parent using jQuery, you can utilize the following code snippet:

// For every p in the Instagram feed
jQuery('#instagram-feed .meta-data p').each(function(){

    // Obtain the width of this p element
    var parentWidth = jQuery(this).width();
    var parent = jQuery(this);

    // Iterate through each a element within this p
    jQuery(this).children('a').each(function(){

        var elementLeft = jQuery(this).position().left - parent.position().left;
        
        // Compare the width of the p element with the position of this a element
        if(parentWidth < elementLeft) {

            // If the position is greater than the width
            jQuery(this).css('color', 'green');
            console.log("Not inside element");

        } else {

            // If the position is smaller than the width
            jQuery(this).css('color', 'red');
            console.log("Inside element");
        }

        // Additional logic here...

    });

});

View the demonstration on JSFiddle: http://jsfiddle.net/fprm7mgd/29/

Answer 3

Answer №2

Upon reviewing the documentation for jQuery.position, it becomes evident that the positioning is with respect to the offset parent. In this scenario, the offset parent is specified as the <html> element and all left values are in relation to this element.

To resolve this issue, a simple adjustment can be made to your CSS: ensure that the paragraph elements have position: relative set.

jQuery(window).on("load resize", function() {
  jQuery("#instagram-feed .meta-data p").each(function() {
    var parentWidth = jQuery(this).width();
    console.log("parent", this, "width", parentWidth);
    jQuery(this).children("a").each(function() {
      var childLeft = jQuery(this).position().left;
      console.log("child", this, "left", childLeft, "offset parent", this.offsetParent);
      if (parentWidth < childLeft) {
        jQuery(this).css("color", "green");
      } else {
        jQuery(this).css("color", "red");
      }
    });
  });
});

.meta-data {
  float: left;
  margin-right: 50px;
}
p {
  width: 160px;
  padding: 5px;
  white-space: nowrap;
  background: silver;
  display: inline-block;
  /* added */
  position: relative;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

<div id="instagram-feed>
  <div class="meta-data>
    <p>fgdfgfdg fdgf df df <a href="#">link</a></p>
  </div>
  <div class="meta-data>
    <p>fgdfgfdg fdgf df df dsfsdf <a href="#">link</a></p>
  </div>
  <div class="meta-data>
    <p>fgdfgfdg fdgf <a href="#">link</a></p>
  </div>
</div>

Answer 4

Upon reviewing the documentation for jQuery.position, it becomes evident that the positioning is with respect to the offset parent. In this scenario, the offset parent is specified as the <html> element and all left values are in relation to this element.

To resolve this issue, a simple adjustment can be made to your CSS: ensure that the paragraph elements have position: relative set.

jQuery(window).on("load resize", function() {
  jQuery("#instagram-feed .meta-data p").each(function() {
    var parentWidth = jQuery(this).width();
    console.log("parent", this, "width", parentWidth);
    jQuery(this).children("a").each(function() {
      var childLeft = jQuery(this).position().left;
      console.log("child", this, "left", childLeft, "offset parent", this.offsetParent);
      if (parentWidth < childLeft) {
        jQuery(this).css("color", "green");
      } else {
        jQuery(this).css("color", "red");
      }
    });
  });
});

.meta-data {
  float: left;
  margin-right: 50px;
}
p {
  width: 160px;
  padding: 5px;
  white-space: nowrap;
  background: silver;
  display: inline-block;
  /* added */
  position: relative;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

<div id="instagram-feed>
  <div class="meta-data>
    <p>fgdfgfdg fdgf df df <a href="#">link</a></p>
  </div>
  <div class="meta-data>
    <p>fgdfgfdg fdgf df df dsfsdf <a href="#">link</a></p>
  </div>
  <div class="meta-data>
    <p>fgdfgfdg fdgf <a href="#">link</a></p>
  </div>
</div>

Answer 5

Answer №3

It is recommended to use the offset property instead of position for a safer approach. According to the documentation at http://api.jquery.com/offset/:

The .offset() method allows us to retrieve the current position of an element relative to the document. Contrast this with .position(), which retrieves the current position relative to the offset parent

When using offset or position, you receive an object with properties like left and top. The key comparison should be between the anchor's left and the parent's calculated right position by adding the parent's width to its offset().left.

Example:

$('#instagram-feed .meta-data').each(function(){
    var parentRight = $(this).offset().left + $(this).width();
    $(this).find('a').each(function(){
        var self = $(this);
        if(self.offset().left > parentRight) {
            self.css('color', 'green');
        } else {
            self.css('color', 'red');
        }
    });
});

Demo Fiddle: http://jsfiddle.net/abhitalks/fprm7mgd/33/

Demo Snippet:

$('#instagram-feed .meta-data').each(function(){
    var parentRight = $(this).offset().left + $(this).width();
    $(this).find('a').each(function(){
var self = $(this);
        if(self.offset().left > parentRight) {
            self.css('color', 'green');
        } else {
            self.css('color', 'red');
        }
    });
});

.meta-data {
    float: left;
    margin-right: 50px;
    border: 1px solid #ddd;
}

p {
    width: 160px;
    padding: 5px;
    white-space: nowrap;
    background: silver;
    display: inline-block;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="instagram-feed">
    <div class="meta-data">
        <p>
            fgdfgfdg fdgf df df <a href="#">link</a>
        </p>
    </div>
    <div class="meta-data">
        <p>
            fgdfgfdg fdgf df df dsfsdf <a href="#">link</a>
        </p>
    </div>
    <div class="meta-data">
        <p>
            fgdfgfdg fdgf <a href="#">link</a>
        </p>
    </div>
</div>

An alternative solution would be to utilize the Javascript getBoundingClientRect method, which provides the size and position of an element in relation to the viewport.

var parents = document.querySelectorAll('.meta-data');
[].forEach.call(parents, function(elem) {
    var parentBounds = elem.getBoundingClientRect(), 
        anchor = elem.getElementsByTagName('A')[0], 
        anchorBounds = anchor.getBoundingClientRect()
    ;
    if (anchorBounds.left > parentBounds.right) {
        anchor.classList.add('red');
    } else {
        anchor.classList.add('green');
    }
});

Demo Fiddle 2: http://jsfiddle.net/abhitalks/n0ak4y7w/

Demo Snippet 2:

var parents = document.querySelectorAll('.meta-data');

[].forEach.call(parents, function(elem) {
    var parentBounds = elem.getBoundingClientRect(), 
        anchor = elem.getElementsByTagName('A')[0], 
        anchorBounds = anchor.getBoundingClientRect()
    ;
    if (anchorBounds.left > parentBounds.right) {
        anchor.classList.add('green');
    } else {
        anchor.classList.add('red');
    }
});

.meta-data {
    float: left;
    margin-right: 50px;
    border: 1px solid #ddd;
}

p {
    width: 160px;
    padding: 5px;
    white-space: nowrap;
    background: silver;
    display: inline-block;
}

.red { color: #f00; }
.green { color: #3c3; }

<div id="instagram-feed">
    <div class="meta-data">
        <p>
            fgdfgfdg fdgf df df <a href="#">link</a>
        </p>
    </div>
    <div class="meta-data">
        <p>
            fgdfgfdg fdgf df df dsfsdf <a href="#">link</a>
        </p>
    </div>
    <div class="meta-data">
        <p>
            fgdfgfdg fdgf <a href="#">link</a>
        </p>
    </div>
</div>

Answer 6

It is recommended to use the offset property instead of position for a safer approach. According to the documentation at http://api.jquery.com/offset/:

The .offset() method allows us to retrieve the current position of an element relative to the document. Contrast this with .position(), which retrieves the current position relative to the offset parent

When using offset or position, you receive an object with properties like left and top. The key comparison should be between the anchor's left and the parent's calculated right position by adding the parent's width to its offset().left.

Example:

$('#instagram-feed .meta-data').each(function(){
    var parentRight = $(this).offset().left + $(this).width();
    $(this).find('a').each(function(){
        var self = $(this);
        if(self.offset().left > parentRight) {
            self.css('color', 'green');
        } else {
            self.css('color', 'red');
        }
    });
});

Demo Fiddle: http://jsfiddle.net/abhitalks/fprm7mgd/33/

Demo Snippet:

$('#instagram-feed .meta-data').each(function(){
    var parentRight = $(this).offset().left + $(this).width();
    $(this).find('a').each(function(){
var self = $(this);
        if(self.offset().left > parentRight) {
            self.css('color', 'green');
        } else {
            self.css('color', 'red');
        }
    });
});

.meta-data {
    float: left;
    margin-right: 50px;
    border: 1px solid #ddd;
}

p {
    width: 160px;
    padding: 5px;
    white-space: nowrap;
    background: silver;
    display: inline-block;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="instagram-feed">
    <div class="meta-data">
        <p>
            fgdfgfdg fdgf df df <a href="#">link</a>
        </p>
    </div>
    <div class="meta-data">
        <p>
            fgdfgfdg fdgf df df dsfsdf <a href="#">link</a>
        </p>
    </div>
    <div class="meta-data">
        <p>
            fgdfgfdg fdgf <a href="#">link</a>
        </p>
    </div>
</div>

An alternative solution would be to utilize the Javascript getBoundingClientRect method, which provides the size and position of an element in relation to the viewport.

var parents = document.querySelectorAll('.meta-data');
[].forEach.call(parents, function(elem) {
    var parentBounds = elem.getBoundingClientRect(), 
        anchor = elem.getElementsByTagName('A')[0], 
        anchorBounds = anchor.getBoundingClientRect()
    ;
    if (anchorBounds.left > parentBounds.right) {
        anchor.classList.add('red');
    } else {
        anchor.classList.add('green');
    }
});

Demo Fiddle 2: http://jsfiddle.net/abhitalks/n0ak4y7w/

Demo Snippet 2:

var parents = document.querySelectorAll('.meta-data');

[].forEach.call(parents, function(elem) {
    var parentBounds = elem.getBoundingClientRect(), 
        anchor = elem.getElementsByTagName('A')[0], 
        anchorBounds = anchor.getBoundingClientRect()
    ;
    if (anchorBounds.left > parentBounds.right) {
        anchor.classList.add('green');
    } else {
        anchor.classList.add('red');
    }
});

.meta-data {
    float: left;
    margin-right: 50px;
    border: 1px solid #ddd;
}

p {
    width: 160px;
    padding: 5px;
    white-space: nowrap;
    background: silver;
    display: inline-block;
}

.red { color: #f00; }
.green { color: #3c3; }

<div id="instagram-feed">
    <div class="meta-data">
        <p>
            fgdfgfdg fdgf df df <a href="#">link</a>
        </p>
    </div>
    <div class="meta-data">
        <p>
            fgdfgfdg fdgf df df dsfsdf <a href="#">link</a>
        </p>
    </div>
    <div class="meta-data">
        <p>
            fgdfgfdg fdgf <a href="#">link</a>
        </p>
    </div>
</div>

Answer 7

Answer №4

The ultimate solution:

//This function is designed to work effectively when the margins and paddings are balanced on both sides.
function excludeFromTabIndex(element, ellipsisWidth){

    var initialEllipsisWidth = ellipsisWidth;
    if (initialEllipsisWidth === undefined || initialEllipsisWidth === null) {
        initialEllipsisWidth = 0;
    }

    jQuery(element).each(function(){
        var calculatedMargin = (jQuery(this).outerWidth(true) - jQuery(this).width()) / 2;
        calculatedMargin = calculatedMargin + initialEllipsisWidth;
        var parentRightValue = (jQuery(this).position().left + jQuery(this).outerWidth(true)) - calculatedMargin;

        jQuery(this).find('a').each(function(){
            if((jQuery(this).position().left) > parentRightValue) {
                jQuery(this).attr('tabindex', '-1');
            } else {
                if ( jQuery(this).attr('tabindex') === '-1') {
                    jQuery(this).removeAttr('tabindex')
                }
            }
        });

    });

};

//Call the function
jQuery(document).ready(function(){
    excludeFromTabIndex('#instagram-feed .meta-data p');
});

//For responsive design
jQuery(window).resize(function () {
    excludeFromTabIndex('#instagram-feed .meta-data p');
});

This script handles padding and margin issues by assuming equal values on left and right sides. Pixel-based margin and padding calculations are necessary since other units like percentages or ems cause inconsistencies.

It executes initially and upon resizing for responsiveness. Additional elements can easily be incorporated using parameters. The function now accepts an ellipsis width parameter for more precise calculations.

With this code snippet, you can implement text truncation with CSS and prevent overflowing links from being included in the tab index, improving accessibility.

http://jsfiddle.net/fprm7mgd/46/

Answer 8

The ultimate solution:

//This function is designed to work effectively when the margins and paddings are balanced on both sides.
function excludeFromTabIndex(element, ellipsisWidth){

    var initialEllipsisWidth = ellipsisWidth;
    if (initialEllipsisWidth === undefined || initialEllipsisWidth === null) {
        initialEllipsisWidth = 0;
    }

    jQuery(element).each(function(){
        var calculatedMargin = (jQuery(this).outerWidth(true) - jQuery(this).width()) / 2;
        calculatedMargin = calculatedMargin + initialEllipsisWidth;
        var parentRightValue = (jQuery(this).position().left + jQuery(this).outerWidth(true)) - calculatedMargin;

        jQuery(this).find('a').each(function(){
            if((jQuery(this).position().left) > parentRightValue) {
                jQuery(this).attr('tabindex', '-1');
            } else {
                if ( jQuery(this).attr('tabindex') === '-1') {
                    jQuery(this).removeAttr('tabindex')
                }
            }
        });

    });

};

//Call the function
jQuery(document).ready(function(){
    excludeFromTabIndex('#instagram-feed .meta-data p');
});

//For responsive design
jQuery(window).resize(function () {
    excludeFromTabIndex('#instagram-feed .meta-data p');
});

This script handles padding and margin issues by assuming equal values on left and right sides. Pixel-based margin and padding calculations are necessary since other units like percentages or ems cause inconsistencies.

It executes initially and upon resizing for responsiveness. Additional elements can easily be incorporated using parameters. The function now accepts an ellipsis width parameter for more precise calculations.

With this code snippet, you can implement text truncation with CSS and prevent overflowing links from being included in the tab index, improving accessibility.

http://jsfiddle.net/fprm7mgd/46/

Determine whether the child element extends beyond the boundaries of the parent element

Answer №1

Answer №2

Answer №3

Answer №4

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