CODEWITHSUNDEEP
javascript
Roberto
Roberto

Reputation: 39

javascript function on multiple buttons

I have three buttons. I would like them to change colour when pressed, and back to no colour when pressed again.

I found this code on stackoverflow that allows me to almost do it however, it only works on one button, the other two are not affected.
Also, when I pressed one of the other two buttons, the first button changes colour. I tried changing ID's on the buttons, adding another script with different getElementById() ID's but nothing works.

Do I need more than one function to achieve what I want?

The code I am using is below.

var count = 1;
function setColor(btn, color) {
  var property = document.getElementById(btn);
  if (count == 0) {
    property.style.backgroundColor = "#FFFFFF";
    count = 1;
  } else {
    property.style.backgroundColor = "#E68352";
    count = 0;
  }
}
<head>
  <link rel="stylesheet" type="text/css" href="styles/main.css"/>
</head>
<body>
  <input type="button" id="button" value = "A-D" style= "color:black" onclick="setColor('button', '#101010')";/>
  <input type="button" id="button" value = "E-H" style= "color:black" onclick="setColor('button', '#101010')";/>
  <input type="button" id="button" value = "E-H" style= "color:black" onclick="setColor('button', '#101010')";/>
</body>

Upvotes: 2

Views: 10090

Answers (8)

WitVault
WitVault

Reputation: 24140

You just need little bit of modification. See the working code.

function setColor(btn, color) {
  var elem = document.getElementById(btn);

  if (elem.hasAttribute("style")) {
    if (elem.getAttribute("style").indexOf("background-color:") == -1) {
          elem.style.backgroundColor = color;
    } else {
          elem.style.backgroundColor = "";
    }
  }
}
<!DOCTYPE html>
<html>

<head>
  <link rel="stylesheet" type="text/css" href="styles/main.css" />
</head>

<body>

  <input type="button" id="button1" value="A-D" style="color:black" onclick="setColor('button1', '#E68352')" ;/>
  <input type="button" id="button2" value="E-H" style="color:black" onclick="setColor('button2', '#E68352')" ;/>
  <input type="button" id="button3" value="E-H" style="color:black" onclick="setColor('button3', '#E68352')" ;/>

</body>

</html>

Upvotes: 0

gaetanoM
gaetanoM

Reputation: 42054

Usually, when you write inline event handler you may take advantage of:

  • this: current element: When code is called from an in–line on-event handler, its this is set to the DOM element on which the listener is placed:
  • event: event element object

Therefore, change:

onclick="setColor('button', '#101010')"

with:

onclick="setColor(this, event, '#101010')"

So your code can be rewritten as:

function hexToRgb(hex) {
    var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
    return result ? 'rgb(' +
        parseInt(result[1], 16) + ', ' +
        parseInt(result[2], 16) + ', ' +
        parseInt(result[3], 16) + ')'
     : null;
}


function setColor(btnEle, evt, color) {
    if (btnEle.style.backgroundColor == hexToRgb("#E68352")) {
        btnEle.style.backgroundColor = "#FFFFFF"
    }
    else {
        btnEle.style.backgroundColor = "#E68352"
    }
}
<input type="button" id="button1" value = "A-D" style= "color:black" onclick="setColor(this, event, '#101010')";/>
<input type="button" id="button2" value = "E-H" style= "color:black" onclick="setColor(this, event, '#101010')";/>
<input type="button" id="button3" value = "E-H" style= "color:black" onclick="setColor(this, event, '#101010')";/>

Upvotes: 2

Daniel
Daniel

Reputation: 301

Roberto, as Ibrahim correctly pointed out, the problem is that you are using the same ID for all buttons. When javascript executes this code:

var property = document.getElementById(btw);

it will always return the first element with the ID specified. One solution is choosing a different ID for each button and updating the corresponding onclick code. Another solution could be the one below, in which you do not need to specify IDs at all and the function setColor could be used for any element.

<!DOCTYPE html>
<html>
<head>
<script>
var count = 1;
function setColor(element, color) {
    if (count == 0) {
        el.style.backgroundColor = "#FFFFFF"
        count = 1;
    }
    else {
        el.style.backgroundColor = "#E68352"
        count = 0;
    }
}
</script>
<link rel="stylesheet" type="text/css" href="styles/main.css"/>
</head>

<body>
    <input type="button" value = "A-D" style= "color:black" onclick="setColor(this, '#101010')";/>
    <input type="button" value = "E-H" style= "color:black" onclick="setColor(this, '#101010')";/>
    <input type="button" value = "E-H" style= "color:black" onclick="setColor(this, '#101010')";/>
</body>
</html>

Note the use of the this variable as the first argument for setColor. In each of the buttons, the corresponding this will point to the element where it is defined.

Hope it helps.

Upvotes: 0

Pasha K
Pasha K

Reputation: 407

dont use numbers, use this instead http://codepen.io/animhotep/pen/qRwjeX?editors=0010

var count = 1;

function setColor(btn, color) {
  if (count == 0) {
    btn.style.backgroundColor = "#FFFFFF"
    count = 1;
  }
  else {
    btn.style.backgroundColor = "#E68352"
    count = 0;
  }
}

Upvotes: 0

mplungjan
mplungjan

Reputation: 178384

IDs need to be unique but you do not need them here

Give the buttons a class and use toggle the classList

window.onload=function() {
  var buts = document.querySelectorAll(".but");
  for (var i=0;i<buts.length;i++) {
    buts[i].onclick=function() {
      this.classList.toggle("clicked");
    }
  }
}
.but {background-color:black}
.clicked { background-color:#E68352; }
<input type="button" value="A-D" class="but" />
<input type="button" value="E-F" class="but" />
<input type="button" value="G-H" class="but" />

Upvotes: 0

Weedoze
Weedoze

Reputation: 13953

You should have uniques ID

You can use classList.toggle("yourClass") instead of using a count 

var buttons = document.getElementsByClassName("button");
for (let i = 0, l = buttons.length; i < l; i++) {
  buttons[i].addEventListener('click', function() {
    buttons[i].classList.toggle('active');
  })
}
.active {
  background-color: #E68352 !important;
}

.button {
  background-color: #FFFFFF;
}
<input type="button" id="button1" class="button" value="A-D" />
<input type="button" id="button2" class="button" value="E-H" />
<input type="button" id="button3" class="button" value="E-H" />

Upvotes: 1

ibrahim mahrir
ibrahim mahrir

Reputation: 31712

IDs should be unique inside the document. Like this:

<input type="button" id="button1" value="A-D" style="color:black" onclick="setColor('button1', '#101010')" ;/>
<--                       here ^                                                      here ^               -->
<input type="button" id="button2" value="E-H" style="color:black" onclick="setColor('button2', '#101010')" ;/>
<--                       here ^                                                      here ^               -->
<input type="button" id="button3" value="E-H" style="color:black" onclick="setColor('button3', '#101010')" ;/>
<--                       here ^                                                      here ^               -->


<!DOCTYPE html>
<html>

<head>
  <script>
    var count = 1;

    function setColor(btn, color) {
      var property = document.getElementById(btn);
      if (count == 0) {
        property.style.backgroundColor = "#FFFFFF"
        count = 1;
      } else {
        property.style.backgroundColor = "#E68352"
        count = 0;
      }
    }
  </script>

  <link rel="stylesheet" type="text/css" href="styles/main.css" />
</head>

<body>

  <input type="button" id="button1" value="A-D" style="color:black" onclick="setColor('button1', '#101010')" ;/>
  <input type="button" id="button2" value="E-H" style="color:black" onclick="setColor('button2', '#101010')" ;/>
  <input type="button" id="button3" value="E-H" style="color:black" onclick="setColor('button3', '#101010')" ;/>

</body>

</html>

Upvotes: 0

thesublimeobject
thesublimeobject

Reputation: 1403

Set a class on the buttons, and then loop through the buttons and add an event listener to each of them:

EDIT: I see you are using an onclick handler, which I didn't notice at first; so this answer might not be as useful as I thought. You should definitely use different IDs though if you use that approach.

<button class="button" ... >

var buttons = document.getElementsByClassName('button')
for (let i = 0; i < buttons.length; i++) {
    buttons[i].addEventListener('click', function() {
        // Do your button things.
    })
}

Upvotes: 0

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