Change the color of an option when selected

Change the color of an option when selected - JavaScript

I want an option to change color when selected by a user. For Example: a user selects the red option then a function would run that would change the color red. If the user then selected green then it would change green. etc.

<select onchange="changeColor();" class="color" id="rgb">

  <option id="red" value="Red">Red</option>

  <option id="green" value="Green">Green</option>

  <option id="blue" value="Blue">Blue</option>

</select>

I'm started with the function below but im not sure where I went wrong.

function changeColor() {

    var red = document.getElementById('red');

    var green = document.getElementById('green');

    var blue = document.getElementById('blue');



    if(event.target.value == red) {

      red.style.color = "red";

    } else if(event.target.value == green) {

      green.style.color = "green";

    } else if(event.target.value == blue) {

      blue.style.color = "blue";

    } else  {

      alert("There was an error!");

      }

  };

edited Nov 18 '18 at 0:15

asked Nov 18 '18 at 0:10

Gorbles

add a comment |

<select onchange="changeColor();" class="color" id="rgb">

  <option id="red" value="Red">Red</option>

  <option id="green" value="Green">Green</option>

  <option id="blue" value="Blue">Blue</option>

</select>

I'm started with the function below but im not sure where I went wrong.

function changeColor() {

    var red = document.getElementById('red');

    var green = document.getElementById('green');

    var blue = document.getElementById('blue');



    if(event.target.value == red) {

      red.style.color = "red";

    } else if(event.target.value == green) {

      green.style.color = "green";

    } else if(event.target.value == blue) {

      blue.style.color = "blue";

    } else  {

      alert("There was an error!");

      }

  };

edited Nov 18 '18 at 0:15

asked Nov 18 '18 at 0:10

Gorbles

add a comment |

<select onchange="changeColor();" class="color" id="rgb">

  <option id="red" value="Red">Red</option>

  <option id="green" value="Green">Green</option>

  <option id="blue" value="Blue">Blue</option>

</select>

I'm started with the function below but im not sure where I went wrong.

function changeColor() {

    var red = document.getElementById('red');

    var green = document.getElementById('green');

    var blue = document.getElementById('blue');



    if(event.target.value == red) {

      red.style.color = "red";

    } else if(event.target.value == green) {

      green.style.color = "green";

    } else if(event.target.value == blue) {

      blue.style.color = "blue";

    } else  {

      alert("There was an error!");

      }

  };

edited Nov 18 '18 at 0:15

asked Nov 18 '18 at 0:10

Gorbles

<select onchange="changeColor();" class="color" id="rgb">

  <option id="red" value="Red">Red</option>

  <option id="green" value="Green">Green</option>

  <option id="blue" value="Blue">Blue</option>

</select>

I'm started with the function below but im not sure where I went wrong.

function changeColor() {

    var red = document.getElementById('red');

    var green = document.getElementById('green');

    var blue = document.getElementById('blue');



    if(event.target.value == red) {

      red.style.color = "red";

    } else if(event.target.value == green) {

      green.style.color = "green";

    } else if(event.target.value == blue) {

      blue.style.color = "blue";

    } else  {

      alert("There was an error!");

      }

  };

javascript dom javascript-events html-select onchange

edited Nov 18 '18 at 0:15

asked Nov 18 '18 at 0:10

Gorbles

edited Nov 18 '18 at 0:15

asked Nov 18 '18 at 0:10

Gorbles

edited Nov 18 '18 at 0:15

asked Nov 18 '18 at 0:10

Gorbles

asked Nov 18 '18 at 0:10

Gorbles

asked Nov 18 '18 at 0:10

Gorbles

add a comment |

3 Answers
3

active

oldest

votes

It looks like you haven't added an 'event' parameter to your function. Try this:

function changeColor(event) {

  var red = document.getElementById(red);

  var green = document.getElementById(green);

  var blue = document.getElementById(blue);



  if (event.target.value == red) {

    red.style.color = "red";

  } else if (event.target.value == green) {

    green.style.color = "green";

  } else if (event.target.value == blue) {

    blue.style.color = "blue";

  } else {

    alert("There was an error!");

  }};

answered Nov 18 '18 at 0:16

nevace

214

that's only 1/2 of how to add it

– charlietfl
Nov 18 '18 at 0:41

add a comment |

Try this. When you select an option you will recieve the <select> element in colorParam. If you select the first option, you will get Red in colorParam.value, but you are using IDs in lowerCase, so you can use toLowerCase() function to convert it. Then select the option element and apply styles.

function changeColor(colorParam) {

    let color = colorParam.value.toLowerCase();

    var optionElement = document.getElementById(color);

    optionElement.style.color = color;

};

<select onchange="changeColor(this);" class="color" id="rgb">

  <option id="red" value="Red">Red</option>

  <option id="green" value="Green">Green</option>

  <option id="blue" value="Blue">Blue</option>

  <option id="white" value="White">White</option>

  <option id="pink" value="Pink">Pink</option>

</select>

edited Nov 18 '18 at 0:45

answered Nov 18 '18 at 0:19

eag845

878611

add a comment |

I'm not sure you can style an <option> element. You can style the <select> element though. However, color doesn't seem to be a property you can change, background-color is.

If that's all you need you could as well inline the javascript code in the onchange handler attribute. You would need to set the values of the <option> elements to valid css colours.

<select onchange="this.style.backgroundColor=this.value">

  <option value="red">Red</option>

  <option value="green">Green</option>

  <option value="blue">Blue</option>

</select>

edited Nov 19 '18 at 8:33

answered Nov 18 '18 at 0:37

customcommander

1,514819

add a comment |

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

It looks like you haven't added an 'event' parameter to your function. Try this:

function changeColor(event) {

  var red = document.getElementById(red);

  var green = document.getElementById(green);

  var blue = document.getElementById(blue);



  if (event.target.value == red) {

    red.style.color = "red";

  } else if (event.target.value == green) {

    green.style.color = "green";

  } else if (event.target.value == blue) {

    blue.style.color = "blue";

  } else {

    alert("There was an error!");

  }};

answered Nov 18 '18 at 0:16

nevace

214

that's only 1/2 of how to add it

– charlietfl
Nov 18 '18 at 0:41

add a comment |

It looks like you haven't added an 'event' parameter to your function. Try this:

function changeColor(event) {

  var red = document.getElementById(red);

  var green = document.getElementById(green);

  var blue = document.getElementById(blue);



  if (event.target.value == red) {

    red.style.color = "red";

  } else if (event.target.value == green) {

    green.style.color = "green";

  } else if (event.target.value == blue) {

    blue.style.color = "blue";

  } else {

    alert("There was an error!");

  }};

answered Nov 18 '18 at 0:16

nevace

214

that's only 1/2 of how to add it

– charlietfl
Nov 18 '18 at 0:41

add a comment |

It looks like you haven't added an 'event' parameter to your function. Try this:

function changeColor(event) {

  var red = document.getElementById(red);

  var green = document.getElementById(green);

  var blue = document.getElementById(blue);



  if (event.target.value == red) {

    red.style.color = "red";

  } else if (event.target.value == green) {

    green.style.color = "green";

  } else if (event.target.value == blue) {

    blue.style.color = "blue";

  } else {

    alert("There was an error!");

  }};

answered Nov 18 '18 at 0:16

nevace

214

It looks like you haven't added an 'event' parameter to your function. Try this:

function changeColor(event) {

  var red = document.getElementById(red);

  var green = document.getElementById(green);

  var blue = document.getElementById(blue);



  if (event.target.value == red) {

    red.style.color = "red";

  } else if (event.target.value == green) {

    green.style.color = "green";

  } else if (event.target.value == blue) {

    blue.style.color = "blue";

  } else {

    alert("There was an error!");

  }};

answered Nov 18 '18 at 0:16

nevace

214

answered Nov 18 '18 at 0:16

nevace

214

answered Nov 18 '18 at 0:16

nevace

214

answered Nov 18 '18 at 0:16

nevace

214

that's only 1/2 of how to add it

– charlietfl
Nov 18 '18 at 0:41

add a comment |

that's only 1/2 of how to add it

– charlietfl
Nov 18 '18 at 0:41

that's only 1/2 of how to add it

– charlietfl
Nov 18 '18 at 0:41

add a comment |

function changeColor(colorParam) {

    let color = colorParam.value.toLowerCase();

    var optionElement = document.getElementById(color);

    optionElement.style.color = color;

};

<select onchange="changeColor(this);" class="color" id="rgb">

  <option id="red" value="Red">Red</option>

  <option id="green" value="Green">Green</option>

  <option id="blue" value="Blue">Blue</option>

  <option id="white" value="White">White</option>

  <option id="pink" value="Pink">Pink</option>

</select>

edited Nov 18 '18 at 0:45

answered Nov 18 '18 at 0:19

eag845

878611

add a comment |

function changeColor(colorParam) {

    let color = colorParam.value.toLowerCase();

    var optionElement = document.getElementById(color);

    optionElement.style.color = color;

};

<select onchange="changeColor(this);" class="color" id="rgb">

  <option id="red" value="Red">Red</option>

  <option id="green" value="Green">Green</option>

  <option id="blue" value="Blue">Blue</option>

  <option id="white" value="White">White</option>

  <option id="pink" value="Pink">Pink</option>

</select>

edited Nov 18 '18 at 0:45

answered Nov 18 '18 at 0:19

eag845

878611

add a comment |

function changeColor(colorParam) {

    let color = colorParam.value.toLowerCase();

    var optionElement = document.getElementById(color);

    optionElement.style.color = color;

};

<select onchange="changeColor(this);" class="color" id="rgb">

  <option id="red" value="Red">Red</option>

  <option id="green" value="Green">Green</option>

  <option id="blue" value="Blue">Blue</option>

  <option id="white" value="White">White</option>

  <option id="pink" value="Pink">Pink</option>

</select>

edited Nov 18 '18 at 0:45

answered Nov 18 '18 at 0:19

eag845

878611

function changeColor(colorParam) {

    let color = colorParam.value.toLowerCase();

    var optionElement = document.getElementById(color);

    optionElement.style.color = color;

};

<select onchange="changeColor(this);" class="color" id="rgb">

  <option id="red" value="Red">Red</option>

  <option id="green" value="Green">Green</option>

  <option id="blue" value="Blue">Blue</option>

  <option id="white" value="White">White</option>

  <option id="pink" value="Pink">Pink</option>

</select>

function changeColor(colorParam) {

    let color = colorParam.value.toLowerCase();

    var optionElement = document.getElementById(color);

    optionElement.style.color = color;

};

<select onchange="changeColor(this);" class="color" id="rgb">

  <option id="red" value="Red">Red</option>

  <option id="green" value="Green">Green</option>

  <option id="blue" value="Blue">Blue</option>

  <option id="white" value="White">White</option>

  <option id="pink" value="Pink">Pink</option>

</select>

function changeColor(colorParam) {

    let color = colorParam.value.toLowerCase();

    var optionElement = document.getElementById(color);

    optionElement.style.color = color;

};

<select onchange="changeColor(this);" class="color" id="rgb">

  <option id="red" value="Red">Red</option>

  <option id="green" value="Green">Green</option>

  <option id="blue" value="Blue">Blue</option>

  <option id="white" value="White">White</option>

  <option id="pink" value="Pink">Pink</option>

</select>

edited Nov 18 '18 at 0:45

answered Nov 18 '18 at 0:19

eag845

878611

edited Nov 18 '18 at 0:45

answered Nov 18 '18 at 0:19

eag845

878611

answered Nov 18 '18 at 0:19

eag845

878611

answered Nov 18 '18 at 0:19

eag845

878611

add a comment |

I'm not sure you can style an <option> element. You can style the <select> element though. However, color doesn't seem to be a property you can change, background-color is.

If that's all you need you could as well inline the javascript code in the onchange handler attribute. You would need to set the values of the <option> elements to valid css colours.

<select onchange="this.style.backgroundColor=this.value">

  <option value="red">Red</option>

  <option value="green">Green</option>

  <option value="blue">Blue</option>

</select>

edited Nov 19 '18 at 8:33

answered Nov 18 '18 at 0:37

customcommander

1,514819

add a comment |

I'm not sure you can style an <option> element. You can style the <select> element though. However, color doesn't seem to be a property you can change, background-color is.

If that's all you need you could as well inline the javascript code in the onchange handler attribute. You would need to set the values of the <option> elements to valid css colours.

<select onchange="this.style.backgroundColor=this.value">

  <option value="red">Red</option>

  <option value="green">Green</option>

  <option value="blue">Blue</option>

</select>

edited Nov 19 '18 at 8:33

answered Nov 18 '18 at 0:37

customcommander

1,514819

add a comment |

I'm not sure you can style an <option> element. You can style the <select> element though. However, color doesn't seem to be a property you can change, background-color is.

If that's all you need you could as well inline the javascript code in the onchange handler attribute. You would need to set the values of the <option> elements to valid css colours.

<select onchange="this.style.backgroundColor=this.value">

  <option value="red">Red</option>

  <option value="green">Green</option>

  <option value="blue">Blue</option>

</select>

edited Nov 19 '18 at 8:33

answered Nov 18 '18 at 0:37

customcommander

1,514819

I'm not sure you can style an <option> element. You can style the <select> element though. However, color doesn't seem to be a property you can change, background-color is.

If that's all you need you could as well inline the javascript code in the onchange handler attribute. You would need to set the values of the <option> elements to valid css colours.

<select onchange="this.style.backgroundColor=this.value">

  <option value="red">Red</option>

  <option value="green">Green</option>

  <option value="blue">Blue</option>

</select>

<select onchange="this.style.backgroundColor=this.value">

  <option value="red">Red</option>

  <option value="green">Green</option>

  <option value="blue">Blue</option>

</select>

<select onchange="this.style.backgroundColor=this.value">

  <option value="red">Red</option>

  <option value="green">Green</option>

  <option value="blue">Blue</option>

</select>

edited Nov 19 '18 at 8:33

answered Nov 18 '18 at 0:37

customcommander

1,514819

edited Nov 19 '18 at 8:33

answered Nov 18 '18 at 0:37

customcommander

1,514819

answered Nov 18 '18 at 0:37

customcommander

1,514819

answered Nov 18 '18 at 0:37

customcommander

1,514819

add a comment |

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