Adjust the hue of a figure based on the color input using JavaScript

Question

Adjust the hue of a figure based on the color input using JavaScript

I recently implemented a colorPicker and now I want to extract the value from it and apply it.

Here is what I have used:

 <li id="color"><input type="color" name="color" onchange="changeColor()"></li>

function changeColor(){
    var selectedShapes = document.getElementsByClassName("selected");
    var len = selectedShapes.length;
    for(var i=0; i<len; ++i)
    {
        selectedShapes[i].style.background = document.getElementsByName("color");
    }
}

The link to the file can be found here: http://jsbin.com/mebiriruzi/edit?css,js,output

Any suggestions on how to effectively utilize the user's selected color input?

javascript html css input

Answer 1

Answer №1

document.getElementsByName("color")

will retrieve a list of elements indicated by the "s" in getElementsByName. An alternative approach would be to use an id and access it using

document.getElementById("color").value

, or you can select the first occurrence of "color" with

document.getElementsByName("color")[0].value

You have two options:

function changeColor(){
    var selectedShapes = document.getElementsByClassName("selected");
    var len = selectedShapes.length;
    for(var i=0; i<len; ++i)
    {
        selectedShapes[i].style.background = document.getElementsByName("color")[0].value;
    }
}

or

<li id="color"><input type="color" id="mySelectedColor" name="color" onchange="changeColor()"></li>

In your JavaScript code:

function changeColor(){
    var selectedShapes = document.getElementsByClassName("selected");
    var len = selectedShapes.length;
    for(var i=0; i<len; ++i)
    {
        selectedShapes[i].style.background = document.getElementById("mySelectedColor").value;
    }
}

Answer 2

document.getElementsByName("color")

will retrieve a list of elements indicated by the "s" in getElementsByName. An alternative approach would be to use an id and access it using

document.getElementById("color").value

, or you can select the first occurrence of "color" with

document.getElementsByName("color")[0].value

You have two options:

function changeColor(){
    var selectedShapes = document.getElementsByClassName("selected");
    var len = selectedShapes.length;
    for(var i=0; i<len; ++i)
    {
        selectedShapes[i].style.background = document.getElementsByName("color")[0].value;
    }
}

or

<li id="color"><input type="color" id="mySelectedColor" name="color" onchange="changeColor()"></li>

In your JavaScript code:

function changeColor(){
    var selectedShapes = document.getElementsByClassName("selected");
    var len = selectedShapes.length;
    for(var i=0; i<len; ++i)
    {
        selectedShapes[i].style.background = document.getElementById("mySelectedColor").value;
    }
}

Answer 3

Answer №2

To retrieve elements with a specific name, the getElementsByName method can be used which returns an array of matching elements. Even if only one element matches the specified name, it will still return an array. To access the first item in this array, you can use bracket notation and reference element 0 (the first element). To obtain the value of this element, you need to access the value property:

document.getElementsByName("color")[0].value

Answer 4

To retrieve elements with a specific name, the getElementsByName method can be used which returns an array of matching elements. Even if only one element matches the specified name, it will still return an array. To access the first item in this array, you can use bracket notation and reference element 0 (the first element). To obtain the value of this element, you need to access the value property:

document.getElementsByName("color")[0].value

Adjust the hue of a figure based on the color input using JavaScript

Answer №1

Answer №2

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