当前页面焦点样式没有用javascript正确设置，有什么问题？

Question

我正在做一个项目，其中一个SVG插图是必不可少的了解网站的内容。

SVG文件应该是一个动画菜单，其中每个圆圈都是一个链接到另一个父页面的按钮。SVG文件作为原始代码插入到页面上。

我在寻求解决这些问题的帮助：

1. 当前页或SVG文件中的相应圆圈在javascript中的定义方式没有使处于:focus模式的圆圈获得带有边框的样式。
2. 这个问题是因为javascript中没有正确地确定“活动”项/页，因此圆圈之间的行不是样式黑色。
3. 当用户在一个子页面上时，圆圈保持焦点模式(用边框样式)。

我正在寻找的结果的图像，看起来像这样

下面的片段带有来自我的测试站点的href链接。当href为#0并且我们不离开页面时，javascript可以工作，但这不是这个菜单的目的。

​

let allCircles = document.querySelectorAll("circle");
// Add an click handler to every circle that
// adds the class "active" to the clicked circle.
allCircles.forEach(element => {
  element.addEventListener("click", clickHandler);
  element.addEventListener("mouseover", mouseoverHandler);
  element.addEventListener("mouseout", mouseoutHandler);
});

function clickHandler(evt) {
  // Clear current selection (remove class "active" from any circle)
  allCircles.forEach((circle) => circle.classList.remove("active"));
  // Mark clicked circle selected
  evt.target.classList.add("active");
  // Clear any currently highlighted lines
  clearHighlightedLines();
}


function mouseoverHandler(evt) {
  let activeCircle = document.querySelector("circle.active");
    document.querySelector("#pagetitle").innerHTML = evt.target.getAttribute('alt')

  let hoveredCircle = evt.target;
  if (activeCircle && (activeCircle != hoveredCircle)) {
    // Get the line that has classes matching both the actibve and hovered circle
    let line = document.querySelector("line." + activeCircle.id + "." + hoveredCircle.id);
    // Add the class "highlight" to that line
    if (line)
      line.classList.add("highlight");
  }
}

function mouseoutHandler(evt) {
  clearHighlightedLines();
}

function clearHighlightedLines() {
  // Find the line with class "highlight" (if any)
  var line = document.querySelector("line.highlight");
  // Remove the class "highlight"
  if (line)
    line.classList.remove("highlight");
}

:root {
        --color-1: #F2B705;
        --color-2: #C30F0E;
        --color-3: #264ABA;
        --color-4: #009CD2;
        --color-5: #E25727;

        
        --color-11: #C29204;
        --color-22: #990B0B;
        --color-33: #172E73;
        --color-44: #006B8E;
        --color-55: #BA4620;
  }
#c1 {
  fill: var(--color-1);
}
#c2 {
  fill: var(--color-2);
}
#c3 {
  fill: var(--color-3);
}

#c4 {
  fill: var(--color-4);
}

#c5 {
  fill: var(--color-5);
}
.cls-7 {
fill: none
    ;
}

#c1.act {
    stroke: red;
    stroke-width: 21.5;
}

#c1.active {
    stroke: var(--color-11);
    stroke-width: 21.5;
}
#c2.active {
    stroke: var(--color-22);
    stroke-width: 21.5;
}
#c3.active {
    stroke: var(--color-33);
    stroke-width: 21.5;
}
#c4.active {
    stroke: var(--color-44);
    stroke-width: 21.5;
}
#c5.active {
    stroke: var(--color-55);
    stroke-width: 21.5;
}
#c1.circle:hover:not(.active) {
  stroke: var(--color-11);
  stroke-width: 21.5;
}
#c2.circle:hover:not(.active) {
  stroke: var(--color-22);
  stroke-width: 21.5;
}
#c3.circle:hover:not(.active) {
  stroke: var(--color-33);
  stroke-width: 21.5;
}
#c4.circle:hover:not(.active) {
  stroke: var(--color-44);
  stroke-width: 21.5;
}
#c5.circle:hover:not(.active) {
  stroke: var(--color-55);
  stroke-width: 21.5;
}

circle.btn1:hover:not(.active) {
  stroke: var(--color-11);
  stroke-width: 21.5;
}
circle.btn2:hover:not(.active) {
  stroke: var(--color-22);
  stroke-width: 21.5;
}
circle.btn3:hover:not(.active) {
  stroke: var(--color-33);
  stroke-width: 21.5;
}
circle.btn4:hover:not(.active) {
  stroke: var(--color-44);
  stroke-width: 21.5;
}
circle.btn5:hover:not(.active) {
  stroke: var(--color-55);
  stroke-width: 21.5;
}

line {
  stroke: #c1c1c1;
  stroke-width: 22;
}

line.highlight {
  stroke: black;
}
.title {
  text-align: center;
}
#pagetitle {
    font-size: 4em;
}

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="-10 -10 940 910">

   <defs>
    <style src="https://aau.gagarindigital.dk/wp-content/uploads/custom-css-js/svg-menu.css"></style>
    
  </defs>
       <polygon id="fem-kant" class="cls-7" points="456.29 7.49 898.87 329.05 729.82 849.33 182.76 849.33 13.71 329.05 456.29 7.49"/>

      <line class="c3 c5" x1="656.32" y1="748.57" x2="133.5" y2="368.62"/>
      <line class="c2 c4" x1="258.55" y1="747.22" x2="779.33" y2="368.43"/>
      <line class="c1 c4" x1="258.55" y1="747.22" x2="457.43" y2="133.5"/>
      <line class="c1 c3" x1="457.43" y1="133.5" x2="657.03" y2="748.57"/>
      <line class="c5 c2" x1="133.5" y1="368.62" x2="779.33" y2="368.43"/>
      <line class="c1 c2" x1="779.33" y1="368.43" x2="457.43" y2="133.5"/>
      <line class="c2 c3" x1="779.33" y1="368.43" x2="657.03" y2="748.57"/>
      <line class="c3 c4" x1="258.55" y1="747.22" x2="657.03" y2="748.57"/>
      <line class="c4 c5" x1="258.55" y1="747.22" x2="133.5" y2="368.62"/>
      <line class="c5 c1" x1="133.5" y1="368.62" x2="457.43" y2="133.5"/>

<a href="https://aau.gagarindigital.dk/trans-disciplinary">
  <circle id="c1" class="btn1 btn" href="/trans-disciplinary" alt="Trans-disciplinary" cx="455.9" cy="133.5" r="133" data-Name="Trans-disciplinary" data-tabindex="1" />
</a>
<a href="https://aau.gagarindigital.dk/data-democracy">
<circle id="c2" class="btn2 btn" href="/data-democracy" alt="Data Democracy" cx="779.33" cy="368.43" r="133" data-Name="Data Democracy" data-tabindex="2" />
</a>
<a href="https://aau.gagarindigital.dk/cryptography-and-math">
<circle id="c3" class="btn3 btn" href="/cryptography-and-math" alt="Cryptography and Math" cx="656.32" cy="748.57" r="133" data-Name="Cryptography and Math" data-tabindex="3" />
</a>
<a href="https://aau.gagarindigital.dk/translation">
<circle id="c4" class="btn4 btn" href="/translation" alt="Translation" cx="256.18" cy="748.57" r="133" data-Name="Translation" data-tabindex="4" />
</a>
<a href="https://aau.gagarindigital.dk/application">
<circle id="c5" class="btn5 btn" href="/application" alt="Application" cx="133.5" cy="368.62" r="133" data-Name="Application" data-tabindex="5" />
</a>
 <script type="text/javascript" src="https://aau.gagarindigital.dk/wp-content/uploads/custom-css-js/svg-menu.js"></script>

    </svg>
<div class="title">
    <p id="pagetitle"> </p>
</div>

​

Answer 1

按下面的方式修改您的代码，它应该可以工作(如果我没有搞砸任何事情)。

更改clickHandler()如下：

function clickHandler(evt) {
  // Activate the circle
  activateCircle(evt.target.id);
  // Remember which one was clicked, so that we can
  // highlight the right one when we get to the subpage
  sessionStorage.setItem("selectedMenuId", evt.target.id);
}

function activateCircle(elementId)
{
  // Clear current selection (remove class "active" from any circle)
  allCircles.forEach((circle) => circle.classList.remove("active"));
  // Mark clicked circle selected
  document.getElementById(elementId).classList.add("active");
  // Clear any currently highlighted lines
  clearHighlightedLines();
}

在子菜单页面中只包含，包括这部分额外的JS。

//--- Initialise the menu -------------------------------------------
// Include this section on the subpages only!
document.querySelector("svg").addEventListener("load", () => {
  // Get the id of the menu item that was selected on the last page
  var activeId = sessionStorage.getItem("selectedMenuId");
  // Activate that circle
  if (activeId)
    activateCircle(activeId);
});