jquery loop to create a border highlight effect

Question

jquery loop to create a border highlight effect

I'm struggling to create a loop that will smoothly transition the border color of an image from black to yellow and back again over a set number of seconds. Additionally, I want the loop to stop when the image is clicked on. I feel like I might not be using the correct tools for this task and could use some guidance on how to approach it. Any suggestions would be greatly appreciated!

Here is what I have attempted so far, but if there is a more efficient method, please let me know!

for (i = 100; i >= 0; i--) {
    $("#imgid").css("border-color", 'rgb(' + i + '%,' + i + '%,0)');
}

There are a few specific things I'd like to learn about:

1.) I am unsure how to merge two loops in order to move both upwards and downwards, allowing the border color to transition between black and yellow continuously. Is this achievable with just one loop?

2.) How can I slow down the loop to control the speed at which the border color fades?

3.) What is the best way to terminate the loop using an onclick() event?

jquery html css

Answer 1

Answer №1

If you're looking to implement animations in your code, starting with the module pattern is a great idea. Below is a basic structure that includes the initial animation:

http://jsfiddle.net/Ue4wy/1/

I will also attempt to incorporate click interruptions, which can sometimes be challenging considering scope limitations.

[Edit]

Here is an updated version with the click functionality implemented successfully:

http://jsfiddle.net/Ue4wy/4/

[/Edit]

Code:

var anim = (function() {
    var i = 0;
    var step = 10;
    var up = true;
    var timer = null;

    var next = function() {
        if (up) {
            i += step;
        }
        else {
            i -= step;
        }
        if(i<0){i=0; up=true;}
        if(i>255){i=255; up=false;}
        update();
    };

    var update = function() {
        $("div").css("border-color", 'rgb(' + i + ',' + i + ',' + 0 + ')');
    };

    var go = function() {
        next();
        timer = window.setTimeout(anim.go, 30);
    };

    var stop = function() {
        if (timer) {
            window.clearTimeout(timer);
            timer = null;
        }
    };

    var addClickHandler = function() {
        $("div").click(function() {
            if(timer){
                anim.stop();
            }
            else{
                anim.go();
            }
        });
    };

    return {
        go: go,
        stop: stop,
        addClickHandler: addClickHandler 
    };
}());

anim.addClickHandler();
anim.go();

Answer 2

If you're looking to implement animations in your code, starting with the module pattern is a great idea. Below is a basic structure that includes the initial animation:

http://jsfiddle.net/Ue4wy/1/

I will also attempt to incorporate click interruptions, which can sometimes be challenging considering scope limitations.

[Edit]

Here is an updated version with the click functionality implemented successfully:

http://jsfiddle.net/Ue4wy/4/

[/Edit]

Code:

var anim = (function() {
    var i = 0;
    var step = 10;
    var up = true;
    var timer = null;

    var next = function() {
        if (up) {
            i += step;
        }
        else {
            i -= step;
        }
        if(i<0){i=0; up=true;}
        if(i>255){i=255; up=false;}
        update();
    };

    var update = function() {
        $("div").css("border-color", 'rgb(' + i + ',' + i + ',' + 0 + ')');
    };

    var go = function() {
        next();
        timer = window.setTimeout(anim.go, 30);
    };

    var stop = function() {
        if (timer) {
            window.clearTimeout(timer);
            timer = null;
        }
    };

    var addClickHandler = function() {
        $("div").click(function() {
            if(timer){
                anim.stop();
            }
            else{
                anim.go();
            }
        });
    };

    return {
        go: go,
        stop: stop,
        addClickHandler: addClickHandler 
    };
}());

anim.addClickHandler();
anim.go();

Answer 3

Answer №2

For those looking to implement a similar feature, check out this helpful resource:

To utilize the timer, simply use $.doTimeout in your code and keep track of the border's current state with a variable.

You can experiment with this functionality here: http://jsfiddle.net/JZ62H/4/ It is currently functioning as desired.

All the provided JavaScript comes from the initial link referenced above.

If you need to adjust the rate, simply modify the 2 in this line of code (it appears twice):

$.doTimeout('timerid', 2, doIt);

I also included a resume feature for added convenience.

Answer 4

For those looking to implement a similar feature, check out this helpful resource:

To utilize the timer, simply use $.doTimeout in your code and keep track of the border's current state with a variable.

You can experiment with this functionality here: http://jsfiddle.net/JZ62H/4/ It is currently functioning as desired.

All the provided JavaScript comes from the initial link referenced above.

If you need to adjust the rate, simply modify the 2 in this line of code (it appears twice):

$.doTimeout('timerid', 2, doIt);

I also included a resume feature for added convenience.

Answer 5

Answer №3

Consider this demonstration:

for (i=0;i<=10;i++)
  {
  if (i==3)
    {
    break;
    }
  document.write("The number is " + i);
  document.write("<br />");
  }

Instead of i == 3 you can search for your specific condition...etc:
http://www.w3schools.com/jsref/event_onclick.asp

Also take a look at Creating Delays in JavaScript

Answer 6

Consider this demonstration:

for (i=0;i<=10;i++)
  {
  if (i==3)
    {
    break;
    }
  document.write("The number is " + i);
  document.write("<br />");
  }

Instead of i == 3 you can search for your specific condition...etc:
http://www.w3schools.com/jsref/event_onclick.asp

Also take a look at Creating Delays in JavaScript

Answer 7

Answer №4

Instead of creating animations from scratch, it is recommended to utilize jQuery's existing functionality:

jQuery provides .animate(), which:
allows for animating CSS properties,
includes options for animation speed,
enables callback functions upon completion of the animation,
although, it does not natively support color transitions; in such cases, you can integrate the color animation plugin (developed by jQuery's creator)

Utilizing these features, here's a sample implementation based on your requirements:

var stop = false; // flag to control animation interruption

function highlight() {
   // Animate border color to yellow over 1000 milliseconds
   $("#imgId").animate({borderColor: "yellow"}, 1000, function () {
      // Check if stop flag is set
      if (stop) return;
      // Transition back to black
      $("#imgId").animate({borderColor: "black"}, 1000, function () {
         // Continue animation cycle unless stop flag is triggered
         if (!stop) highlight();
      });
   });
}

// Initiate animation loop
highlight();

// Click event handler
$("#imgId").click(function () {
   stop = true;
});

Answer 8

Instead of creating animations from scratch, it is recommended to utilize jQuery's existing functionality:

jQuery provides .animate(), which:
allows for animating CSS properties,
includes options for animation speed,
enables callback functions upon completion of the animation,
although, it does not natively support color transitions; in such cases, you can integrate the color animation plugin (developed by jQuery's creator)

Utilizing these features, here's a sample implementation based on your requirements:

var stop = false; // flag to control animation interruption

function highlight() {
   // Animate border color to yellow over 1000 milliseconds
   $("#imgId").animate({borderColor: "yellow"}, 1000, function () {
      // Check if stop flag is set
      if (stop) return;
      // Transition back to black
      $("#imgId").animate({borderColor: "black"}, 1000, function () {
         // Continue animation cycle unless stop flag is triggered
         if (!stop) highlight();
      });
   });
}

// Initiate animation loop
highlight();

// Click event handler
$("#imgId").click(function () {
   stop = true;
});

jquery loop to create a border highlight effect

Answer №1

Answer №2

Answer №3

Answer №4

Similar questions

When an HTML element is deleted, its events are not being removed as expected

What is the best way to address a row of hyperlink text located at the top of a webpage?

Bringing app templates and static files into Django templates

Calculate the minimum date that can be selected on a jQuery UI datepicker to be x years from

Why doesn't the date appear in the Textbox when the TextMode is set to "Date"?

Empty Media Viewer

Having trouble getting my JS/CSS code to work for a single image music play/pause button. Any suggestions on how to fix it?

Creating a button that adjusts its size proportionally to the page and surrounding elements, all without relying on positioning

AngularJS failing to display HTML content is a common issue encountered

Currently experiencing difficulties while attempting to create a Simon game in JavaScript. Seeking assistance to troubleshoot the issue

What is the process for deleting an animation using JavaScript, and how can the background color be altered?

Is there a way to generate a SVG path connecting various DIV elements programmatically?

Function that can be shared between two separate jQuery files

Activate animation when hovering over an image within a container

Issue with IE7 causing rollover navigation blocks to disappear when hovering over content

While executing a jssor code in SP 2007, IE experiences freezing issues

The division is refusing to make an appearance

Using Selenium with C# to input text into an HTML <input> tag is not functioning properly

The essence of jQuery lies in its functionality

I'm experiencing some issues with the jQuery autocomplete functionality when implemented as a directive in AngularJS. It seems like there are some bugs that are