How to change the color of section of a SVG on click then change back after clicking elsewhere?

Question

I am trying to figure out how to make it so when a user clicks a state on a SVG map of the US (specially this one) the state changes color. In addition when they click on another state or anywhere else, the color of the previous state goes back to the default.

So far I have functions to change the colors, but not sure how to select the specific states themselves.

function ColorChange() {
this.style.fill = "#0A3161";
return false;
}

function RestoreColor() {
this.style.color = "#D3D3D3";
return false;
} 

Answer 1

You could also use a class that gets toggled on click.
This class (e.g. ".on") will override the default fill property:

const map = document.querySelector('.svg-states');
const states = map.querySelectorAll('.state');

states.forEach(function(state, i) {
  state.addEventListener('click', function(e) {
    let current = e.currentTarget;
    // reset all prevously clicked except the current state
    reset_colors(current);
    current.classList.toggle('on');
  })
})

function reset_colors(exclude) {
  const activeStates = map.querySelectorAll('.on');
  activeStates.forEach(function(state, i) {
    if (state !== exclude) {
      state.classList.remove('on');
    }
  });
}

svg {
  display: block;
  height: 90vmin;
}

.state {
  cursor: pointer;
}

.state.on {
  fill: red;
}

<svg viewBox="0 0 959 593" class="svg-states">
  <title>U.S. States</title>
  <g id="states">

    <path class="state" id="AZ" fill="#D3D3D3" d="M137.7,387.5l-2.6,2.2l-0.3,1.5l0.5,1l18.9,10.7l12.1,7.6l14.7,8.6l16.8,10l12.3,2.4l25.1,2.7 l2.5-12.5l3.8-27.2l7-52.9l4.3-31l-24.6-3.7l-27.2-4.6l-33.4-6.3l-2.9,18.1l-0.5,0.5l-1.7,2.6l-2.5-0.1l-1.3-2.7l-2.7-0.3l-0.9-1.1 h-0.9l-0.9,0.6l-1.9,1l-0.1,7l-0.2,1.7l-0.6,12.6l-1.5,2.2l-0.6,3.3l2.7,4.9l1.3,5.8l0.8,1l1,0.6l-0.1,2.3l-1.6,1.4l-3.4,1.7 l-1.9,1.9l-1.5,3.7l-0.6,4.9l-2.9,2.7l-2.1,0.7l-0.1,5.8l-0.5,1.7l0.5,0.8l3.7,0.6l-0.6,2.7l-1.5,2.2L137.7,387.5z"></path>
    <path class="state" id="CA" fill="#D3D3D3" d="M136.9,386.8l3.8-0.5l1.5-2l0.7-1.9l-3.2-0.1l-1.1-1.8l0.8-1.7l0-6.2l2.2-1.3l2.7-2.6l0.4-4.9 l1.6-3.5l1.9-2.1l3.3-1.7l1.3-0.7l0.8-1.5l-0.9-0.9l-1-1.5l-0.9-5.3l-2.9-5.2l0.1-2.8l-2.2-3.2l-15-23.2l-19.4-28.7l-22.4-33 l-12.7-19.5l1.8-7.2l6.8-25.9l8.1-31.4l-12.4-3.3l-13.5-3.4l-12.6-4.1l-7.5-2.1l-11.4-3l-7.1-2.4l-1.6,4.7l-0.2,7.4l-5.2,11.8 l-3.1,2.6l-0.3,1.1l-1.8,0.8l-1.5,4.2l-0.8,3.2l2.7,4.2l1.6,4.2l1.1,3.6l-0.3,6.5l-1.8,3.1l-0.6,5.8l-1,3.7l1.8,3.9l2.7,4.5 l2.3,4.8l1.3,4l-0.3,3.2l-0.3,0.5v2.1l5.7,6.3l-0.5,2.4l-0.6,2.3l-0.6,1.9l0.2,8.2l2.1,3.7l1.9,2.6l2.7,0.5l1,2.7l-1.1,3.6 l-2.1,1.6h-1.1l-0.8,3.9l0.5,2.9l3.2,4.4l1.6,5.3l1.5,4.7l1.3,3.1l3.4,5.8l1.5,2.6l0.5,2.9l1.6,1v2.4l-0.8,1.9l-1.8,7.1l-0.5,1.9 l2.4,2.7l4.2,0.5l4.5,1.8l3.9,2.1h2.9l2.9,3.1l2.6,4.8l1.1,2.3l3.9,2.1l4.8,0.8l1.5,2.1l0.6,3.2l-1.5,0.6l0.3,1l3.2,0.8l2.7,0.2 l2.9,4.7l3.9,4.2l0.8,2.3l2.6,4.2l0.3,3.2v9.4l0.5,1.8l10,1.5l19.7,2.7L136.9,386.8z M48.8,337l1.3,1.5l-0.2,1.3l-3.2-0.1 l-0.6-1.2l-0.6-1.5L48.8,337z M50.7,337l1.2-0.6l3.6,2.1l3.1,1.2l-0.9,0.6l-4.5-0.2l-1.6-1.6L50.7,337z M71.4,356.8l1.8,2.3 l0.8,1l1.5,0.6l0.6-1.5l-1-1.8l-2.7-2l-1.1,0.2V356.8z M70,365.5l1.8,3.2l1.2,1.9l-1.5,0.2l-1.3-1.2c0,0-0.7-1.5-0.7-1.9 s0-2.2,0-2.2L70,365.5z"></path>
    <path class="state" id="CO" fill="#D3D3D3" d="M378.6,256.8l1.4-21.3l-32.1-3.1l-24.5-2.7l-37.3-4.1l-20.7-2.5l-2.6,22.2l-3.2,22.4l-3.8,28 l-1.5,11.1l-0.3,2.8l33.9,3.8l37.7,4.3l32,3.2l16.6,0.8"></path>

    <path class="state" id="ID" fill="#D3D3D3" d="M162.1,181c-22.6-4.3-14.1-2.8-21.1-4.4l4.4-17.5l4.3-17.7l1.4-4.2l2.5-5.9l-1.3-2.3l-2.5,0.1 l-0.8-1l0.5-1.1l0.3-3.1l4.5-5.5l1.8-0.5l1.1-1.1l0.6-3.2l0.9-0.7l3.9-5.8l3.9-4.3l0.2-3.8l-3.4-2.6l-1.3-4.4l0.4-9.7l3.7-16.5 l4.5-20.8l3.8-13.5l0.8-3.8l13,2.5l-4.2,21.5l2.9,7.7l-1.1,4.6l2,4.6l3.2,1.7l4.5,9.8l2.7,3.8l0.6,1.1l3.4,1.1l0.5,2.5l-6.9,16.8 l0.3,3.3l2.7,2.9l1.9,0.5l4.8-3.6l0.4-0.5l0.2,0.8l0.3,4.1l2.6,12.9l3.5,2.7l0.4,0.8l2.1,2.4l-0.8,2.8l0.7,3.8l1.9,0.9l2.1-1.6 l2.6-0.5l3.4,1.6l2.5-0.6l3.8-0.2l4,1.6l2.7-0.3l0.9-2.3l2.5-1.6l0.7,1.7l0.6,2.2l2.3,2.5l-3.8,24l-5.1,29l-4.2-0.3l-8.2-1.5 l-9.8-1.8l-12.2-2.4l-12.5-2.5l-8.5-1.8l-9.3-1.7L162.1,181z"></path>

    <path class="state" id="KS" fill="#D3D3D3" d="M503.4,325.1l-12.6,0.2l-46.1-0.5l-44.6-2.1l-24.6-1.3l4.1-64.7l21.8,0.8l40.5,1.4l44.1,0.5h5.1 l3.2,3.2l2.8,0.2l0.9,1.1v2l-1.8,1.6l-0.5,2.6l2.2,3.6l2.5,3.1l2.5,2l1.1,11.2L503.4,325.1z"></path>

    <path class="state" id="MT" fill="#D3D3D3" d="M356.7,122.3l0.6-11.2l2.3-24.8c0.5-5,1.1-8.5,1.4-15.4l0.9-14.6l-30.7-2.8L302,50l-29.3-4 l-32.3-5.3l-18.4-3.4l-32.7-6.9l-4.5,21.3l3.4,7.5l-1.4,4.6l1.8,4.6l3.2,1.4l4.6,10.8l2.7,3.2l0.5,1.1l3.4,1.1l0.5,2.1l-7.1,17.6 v2.5l2.5,3.2h0.9l4.8-3l0.7-1.1l1.6,0.7l-0.2,5.3l2.7,12.6l3,2.5l0.9,0.7l1.8,2.3l-0.5,3.4l0.7,3.4l1.1,0.9l2.3-2.3h2.7l3.2,1.6 l2.5-0.9h4.1l3.7,1.6l2.7-0.5l0.5-3l3-0.7l1.4,1.4l0.5,3.2l1.8,1.4l1.5-11.6l20.7,3l28.2,4l16.6,1.9l31.4,3.5l11,1.5l1.1-15.4 L356.7,122.3z"></path>

    <path class="state" id="ND" fill="#D3D3D3" d="M471.3,127.7l-0.4-7.5l-2-7.3l-1.8-13.6l-0.5-9.8l-2-3.1l-1.6-5.4v-10.3l0.7-3.9l-2.1-5.5 l-28.4-0.6l-18.6-0.6l-26.5-1.3l-24.9-1.9l-1.3,14.2l-1.4,15.1l-2.3,24.9l-0.5,11l56.8,3.8L471.3,127.7z"></path>
    <path class="state" id="NE" fill="#D3D3D3" d="M484.2,247l1.4,2.7l0.1,2.1l2.4,3.7l2.7,3.2h-5l-43.5-0.9l-40.8-0.9l-21.2-1l1.1-21.3l-33.4-2.7 l4.3-44l15.5,1L388,190l17.8,1.1l23.8,1.1l10.7-0.5l2.1,2.3l4.8,3l1.1,0.9l4.3-1.4l3.9-0.5l2.7-0.2l1.8,1.4l5,1.6l3,1.6l0.5,1.6 l0.9,2.1h1.8l0.8,0l1,5.2l2.7,8l1.2,4.6l2.1,3.8l0.5,4.9l1.4,4.3l0.5,6.5"></path>

    <path class="state" id="NM" fill="#D3D3D3" d="M282.7,431l-0.7-6.1l8.6,0.5l29.5,3.1l28.4,1.4l2-22.3l3.7-55.9l1.1-19.4l2,0.3l0-11.1l-32.2-2.4 l-36.9-4.4l-34.5-4.1l-4.2,30.8l-7,53.2l-3.8,26.9l-2,13.3l15.5,2l1.3-10l16.7,2.6L282.7,431z"></path>
    <path class="state" id="NV" fill="#D3D3D3" d="M140.7,177.6l21,4.5l9.7,1.9l9.3,1.8l6.6,1.6l-0.6,5.9l-3.5,17.3l-4.1,20l-1.9,9.7l-2.2,13.3 l-3.2,16.4l-3.5,15.7l-2,10.2l-2.5,16.8l-0.5,1.1l-1.1,2.5l-1.9-0.1l-1.1-2.7l-2.7-0.5l-1.4-1l-2,0.3l-0.9,0.7l-1.3,1.3l-0.4,7 l-0.5,1.7l-0.4,12.1l-1.3,1.7l-1.9-2.3l-14.5-22.7l-19.4-29L89.6,249l-12.4-18.6l1.6-6.6l7-25.9l7.9-31.3l33.6,8.1l13.7,3"></path>

    <path class="state" id="OK" fill="#D3D3D3" d="M375.3,322.6l-10.7-0.5l-6.4-0.5l0.3,0.2l-0.7,10.4l22,1.4l32.1,1.3l-2.3,24.4l-0.5,17.8l0.2,1.6 l4.3,3.7l2.1,1.1l0.7-0.2l0.7-2.1l1.4,1.8h2.1v-1.4l2.7,1.4l-0.5,3.9l4.1,0.2l2.5,1.1l4.1,0.7l2.5,1.8l2.3-2.1l3.4,0.7l2.5,3.4h0.9 v2.3l2.3,0.7l2.3-2.3l1.8,0.7h2.5l0.9,2.5l4.8,1.8l1.4-0.7l1.8-4.1h1.1l1.1,2.1l4.1,0.7l3.7,1.4l3,0.9l1.8-0.9l0.7-2.5h4.3l2.1,0.9 l2.7-2.1h1.1l0.7,1.6h4.1l1.6-2.1l1.8,0.5l2.1,2.5l3.2,1.8l3.2,0.9l1.9,1.1l-0.4-37.2l-1.4-11l-0.2-8.9l-1.4-6.5l-0.8-7.2l-0.1-3.8 l-12.1,0.3l-46.4-0.5l-45-2.1L375.3,322.6z"></path>
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    <path class="state" id="TX" fill="#D3D3D3" d="M357.1,333.4l22.7,1.1l31.1,1.1l-2.3,23.5l-0.3,18.2l0.1,2.1l4.3,3.8l1.7,0.8l1.8,0.3l0.7-1.3 l0.9,0.9l1.7,0.5l1.6-0.7l1.1,0.4l-0.3,3.4l4.3,1l2.7,0.8l4,0.5l2.2,1.8l3.2-1.6l2.8,0.4l2,2.8l1.1,0.3l-0.2,2l3.1,1.2l2.8-1.8 l1.5,0.4l2.4,0.2l0.4,1.9l4.6,2l2.7-0.2l2-4.1h0.3l1.1,1.9l4.4,1l3.3,1.2l3.3,0.8l2.1-0.8l0.8-2.5h3.7l1.9,0.8l3.1-1.6h0.7l0.4,1.1 h4.3l2.4-1.3l1.7,0.3l1.4,1.9l2.9,1.7l3.5,1.1l2.7,1.4l2.4,1.6l3.3-0.9l1.9,1l0.5,10.1l0.3,9.7l0.7,9.5l0.5,4l2.7,4.6l1.1,4.1 l3.9,6.3l0.5,2.9l0.5,1l-0.7,7.5l-2.7,4.4l1,2.9l-0.4,2.5l-0.8,7.3l-1.4,2.7l0.6,4.4l-5.7,1.6l-9.9,4.5l-1,1.9l-2.6,1.9l-2.1,1.5 l-1.3,0.8l-5.7,5.3l-2.7,2.1l-5.3,3.2l-5.7,2.4l-6.3,3.4l-1.8,1.5l-5.8,3.6l-3.4,0.6l-3.9,5.5l-4,0.3l-1,1.9l2.3,1.9l-1.5,5.5 l-1.3,4.5l-1.1,3.9l-0.8,4.5l0.8,2.4l1.8,7l1,6.1l1.8,2.7l-1,1.5l-3.1,1.9l-5.7-3.9l-5.5-1.1l-1.3,0.5l-3.2-0.6l-4.2-3.1l-5.2-1.1 l-7.6-3.4l-2.1-3.9l-1.3-6.5l-3.2-1.9l-0.6-2.3l0.6-0.6l0.3-3.4l-1.3-0.6l-0.6-1l1.3-4.4l-1.6-2.3l-3.2-1.3l-3.4-4.4l-3.6-6.6 l-4.2-2.6l0.2-1.9l-5.3-12.3l-0.8-4.2l-1.8-1.9l-0.2-1.5l-6-5.3l-2.6-3.1v-1.1l-2.6-2.1l-6.8-1.1l-7.4-0.6l-3.1-2.3l-4.5,1.8 l-3.6,1.5l-2.3,3.2l-1,3.7l-4.4,6.1l-2.4,2.4l-2.6-1l-1.8-1.1l-1.9-0.6l-3.9-2.3v-0.6l-1.8-1.9l-5.2-2.1l-7.4-7.8l-2.3-4.7v-8.1 l-3.2-6.5l-0.5-2.7l-1.6-1l-1.1-2.1l-5-2.1l-1.3-1.6l-7.1-7.9l-1.3-3.2l-4.7-2.3l-1.5-4.4l-2.6-2.9l-1.9-0.5l-0.6-4.7l8,0.7l29,2.7 l29.3,1.6l2.3-23.8l3.9-55.6l1.6-18.7l1.4,0 M457.2,567.3l-0.6-7.1l-2.7-7.2l-0.6-7l1.5-8.2l3.3-6.9l3.5-5.4l3.2-3.6l0.6,0.2 l-4.8,6.6l-4.4,6.5l-2,6.6l-0.3,5.2l0.9,6.1l2.6,7.2l0.5,5.2l0.2,1.5L457.2,567.3z"></path>
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    <path class="state" id="WA" fill="#D3D3D3" d="M93.6,6.4l4.4,1.5l9.7,2.7l8.6,1.9l20,5.7l23,5.7l15.2,3.4l-1,3.9l-4.1,13.8l-4.5,20.8 l-3.2,16.1l-0.4,9.4l-13.2-3.9l-15.6-3.4l-13.7,0.6l-1.6-1.5l-5.3,1.9l-4-0.3l-2.7-1.8l-1.6,0.5l-4.2-0.2l-1.9-1.4l-4.8-1.7 l-1.4-0.2l-5-1.3l-1.8,1.5l-5.7-0.3l-4.8-3.8l0.2-0.8l0.1-7.9l-2.1-3.9l-4.1-0.7l-0.4-2.4l-2.5-0.6l-2.9-0.5l-1.8,1l-2.3-2.9 l0.3-2.9l2.7-0.3l1.6-4l-2.6-1.1l0.2-3.7l4.4-0.6l-2.7-2.7l-1.5-7.1l0.6-2.9v-7.9l-1.8-3.2l2.3-9.4l2.1,0.5l2.4,2.9l2.7,2.6 l3.2,1.9l4.5,2.1l3.1,0.6l2.9,1.5l3.4,1l2.3-0.2v-2.4l1.3-1.1l2.1-1.3l0.3,1.1l0.3,1.8l-2.3,0.5l-0.3,2.1l1.8,1.5l1.1,2.4l0.6,1.9 l1.5-0.2l0.2-1.3l-1-1.3l-0.5-3.2l0.8-1.8l-0.6-1.5V19l1.8-3.6l-1.1-2.6l-2.4-4.8l0.3-0.8L93.6,6.4z M84.1,12.3l2-0.2 l0.5,1.4l1.5-1.6h2.3l0.8,1.5l-1.5,1.7l0.6,0.8l-0.7,2l-1.4,0.4c0,0-0.9,0.1-0.9-0.2s1.5-2.6,1.5-2.6l-1.7-0.6l-0.3,1.5l-0.7,0.6 l-1.5-2.3L84.1,12.3z"></path>

    <path class="state" id="WY" fill="#D3D3D3" d="M354.3,143.8l-10.5-0.8l-32.1-3.3l-16.2-2.1l-28.3-4.1l-19.9-3l-1.4,11.2l-3.8,24.3l-5.3,30.4 l-1.5,10.5l-1.7,11.9l6.5,0.9l25.9,2.5l20.6,2.3l36.8,4.1l23.8,2.9l4.5-44.2l1.4-25.4L354.3,143.8z"></path>

  </g>

</svg>

You can toggle highlighting for each path (clicking multiple times).
Click another state will run reset_colors(exclude) to remove previously highlighted state elements.

Answer 2

document.addEventListener('click', function(e) {
    e = e || window.event;
    var target = e.target /* || e.srcElement,
        text = target.textContent || target.innerText*/;   
 
       
 const id = document.getElementById(target.id)
 id.setAttribute("fill","#FF0000")
    
 console.log(target)
});

Answer 3

Key is to save the (previous) clicked object in a sensible location.

<svg viewBox="0 0 200 100">
  <circle cx="50" cy="50" r="45" fill="red" />
  <circle cx="100" cy="50" r="45" fill="green" />
  <circle cx="150" cy="50" r="45" fill="blue" />
</svg>

<script>
  let svg = document.querySelector("svg");
  svg.onclick = (evt) => {
    let previous = svg.previous;
    if (previous) {
        previous.setAttribute("fill", previous.getAttribute("savedfill"));
    }
    let clicked = evt.target;
    clicked.setAttribute("savedfill", clicked.getAttribute("fill"));
    clicked.setAttribute("fill", "gold");
    svg.previous = clicked;
  }
</script>