【JavaScript html 】 sliding verification

index.html

<div id="dragContainer"><!-- Initial background of container -->
  <div id="dragBg"></div><!-- Green background -->
  <div id="dragText"></div><!-- Sliding container text -->
  <div id="dragHandler" class="dragHandlerBg"></div>
</div> <!-- Slider Initial background of the slider -->

javascript-html-sliding-verification.markdown

【JavaScript html 】 sliding verification

A Pen by Edward Lance Lorilla on CodePen.

License.

script.js

//Load (the event will be triggered after the page is loaded)
window.onload = function() {
  //Get the sliding control container, gray background
  var dragContainer = document.getElementById("dragContainer");
  //Get the left part of the slider, green background
  var dragBg = document.getElementById("dragBg");
  //Get the sliding verification container text
  var dragText = document.getElementById("dragText");
  //Get the slider
  var dragHandler = document.getElementById("dragHandler");
  
  //The maximum offset of the slider = the text length of the sliding verification container-the length of the slider
  var maxHandlerOffset = dragContainer.clientWidth-dragHandler.clientWidth;
  //Whether the verification is successful
  var isVertifySucc = false;
  
  initDrag();
  
  function initDrag() {
    //Write "drag slider verification" in the sliding verification container text
    dragText.textContent = "Drag the slider to verify";
    //Add mouse press monitoring to the slider
    dragHandler.addEventListener("mousedown", onDragHandlerMouseDown);
  }
  
  //Select the slider
  function onDragHandlerMouseDown() {
    //Mouse movement monitoring
    document.addEventListener("mousemove", onDragHandlerMouseMove);
    //Release the mouse to
    document.addEventListener("mouseup", onDragHandlerMouseUp);
  }
  
  //Sliders move
  function onDragHandlerMouseMove() {
    /*
    There is no width attribute for html elements, only clientWidth
    offsetX is relative to the current element, clientX and pageX are relative to its parent element
    */
    //The amount of slider movement
    var left = event.clientX-dragHandler.clientWidth / 2;
    //
    if(left <0) {
      left = 0;
      //If the movement of the slider> the maximum offset of the slider, call the verification success function
    } else if(left> maxHandlerOffset) {
      left = maxHandlerOffset;
      verifySucc();
    }
    //The amount of slider movement
    dragHandler.style.left = left + "px";
    //The length of the green background
    dragBg.style.width = dragHandler.style.left;
  }
  
  //Release the slider function
  function onDragHandlerMouseUp() {
    //Remove mouse movement monitoring
    document.removeEventListener("mousemove", onDragHandlerMouseMove);
    //Remove the mouse and release the monitor
    document.removeEventListener("mouseup", onDragHandlerMouseUp);
    //Initialize the movement of the slider
    dragHandler.style.left = 0;
    //Initialize the green background
    dragBg.style.width = 0;
  }
  
  //Verification is successful
  function verifySucc() {
    //Successful mark, no rebound
    isVertifySucc = false;
    //The text of the container text is changed to white "verification passed" font
    dragText.textContent = "Verification passed";
    dragText.style.color = "white";
    //Verify the background of the slider passed
    dragHandler.setAttribute("class", "dragHandlerOkBg");
    //Remove mouse press monitoring
    dragHandler.removeEventListener("mousedown", onDragHandlerMouseDown);
    //Remove mouse movement monitoring
    document.removeEventListener("mousemove", onDragHandlerMouseMove);
    //Remove the mouse and release the monitor
    document.removeEventListener("mouseup", onDragHandlerMouseUp);
    // After the match is successful, write the page you want to jump to
    //window.location.href="success page.html" rel="external nofollow";
  };
}

style.css

#dragContainer {
  position: relative;
  display: inline-block;
  background: #e8e8e8;
  width: 300px;
  height: 33px;
  border: 2px solid #e8e8e8;
}

#dragBg {
  position: absolute;
  background-color: #7ac23c;
  width: 0px;
  height: 100%;
}

#dragText {
  position: absolute;
  width: 100%;
  height: 100%;
  
  text-align: center;
  
  line-height: 33px;
  
  user-select: none;
  -webkit-user-select: none;
}
#dragHandler {
  position: absolute;
  width: 40px;
  height: 100%;
  cursor: move;
}
.dragHandlerBg {
  background: #fff no-repeat center url("data:image/png;base64,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");
}
.dragHandlerOkBg {
  background: #fff no-repeat center url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAA3hpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuNS1jMDIxIDc5LjE1NTc3MiwgMjAxNC8wMS8xMy0xOTo0NDowMCAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZXNjcmlwdGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wTU09Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9tbS8iIHhtbG5zOnN0UmVmPSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAvc1R5cGUvUmVzb3VyY2VSZWYjIiB4bWxuczp4bXA9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC8iIHhtcE1NOk9yaWdpbmFsRG9jdW1lbnRJRD0ieG1wLmRpZDo0ZDhlNWY5My05NmI0LTRlNWQtOGFjYi03ZTY4OGYyMTU2ZTYiIHhtcE1NOkRvY3VtZW50SUQ9InhtcC5kaWQ6NDlBRDI3NjVGMkQ2MTFFNEI5NDBCMjQ2M0ExMDQ1OUYiIHhtcE1NOkluc3RhbmNlSUQ9InhtcC5paWQ6NDlBRDI3NjRGMkQ2MTFFNEI5NDBCMjQ2M0ExMDQ1OUYiIHhtcDpDcmVhdG9yVG9vbD0iQWRvYmUgUGhvdG9zaG9wIENDIDIwMTQgKE1hY2ludG9zaCkiPiA8eG1wTU06RGVyaXZlZEZyb20gc3RSZWY6aW5zdGFuY2VJRD0ieG1wLmlpZDphNWEzMWNhMC1hYmViLTQxNWEtYTEwZS04Y2U5NzRlN2Q4YTEiIHN0UmVmOmRvY3VtZW50SUQ9InhtcC5kaWQ6NGQ4ZTVmOTMtOTZiNC00ZTVkLThhY2ItN2U2ODhmMjE1NmU2Ii8+IDwvcmRmOkRlc2NyaXB0aW9uPiA8L3JkZjpSREY+IDwveDp4bXBtZXRhPiA8P3hwYWNrZXQgZW5kPSJyIj8+k+sHwwAAASZJREFUeNpi/P//PwMyKD8uZw+kUoDYEYgloMIvgHg/EM/ptHx0EFk9I8wAoEZ+IDUPiIMY8IN1QJwENOgj3ACo5gNAbMBAHLgAxA4gQ5igAnNJ0MwAVTsX7IKyY7L2UNuJAf+AmAmJ78AEDTBiwGYg5gbifCSxFCZoaBMCy4A4GOjnH0D6DpK4IxNSVIHAfSDOAeLraJrjgJp/AwPbHMhejiQnwYRmUzNQ4VQgDQqXK0ia/0I17wJiPmQNTNBEAgMlQIWiQA2vgWw7QppBekGxsAjIiEUSBNnsBDWEAY9mEFgMMgBk00E0iZtA7AHEctDQ58MRuA6wlLgGFMoMpIG1QFeGwAIxGZo8GUhIysmwQGSAZgwHaEZhICIzOaBkJkqyM0CAAQDGx279Jf50AAAAAABJRU5ErkJggg==");
}