[英]Using JavaScript to edit CSS gradient
I am working on editing CSS gradients through JavaScript in Firefox.我正在 Firefox 中通过 JavaScript 编辑 CSS 渐变。 I have input boxes where the user can put 1. Orientation 2. 1st Color 3. 2nd Color
我有输入框,用户可以在其中放置 1. Orientation 2. 1st Color 3. 2nd Color
Here is the html这是html
<html>
<head>
<title>Linear Gradient Control</title>
<script>
function renderButton(){
var orientation = document.getElementById("firstValue").value;
var colorOne = document.getElementById("firstColor").value;
var colorTwo = document.getElementById("secondColor").value;
//alert(orientation);
//alert(colorOne);
//alert(colorTwo);
};
</script>
<style>
#mainHolder
{
width:500px;
background: -moz-linear-gradient(left, green, red);
}
</style>
</head>
<body>
<h1>Gradient Editor</h1>
<form>
<input type="text" id="firstValue">orientation</input><br />
<input type="text" id="firstColor">first color</input><br />
<input type="text" id="secondColor">second color</input><br />
</form>
<button type="button" onclick="renderButton()">Render</button>
<div id="mainHolder">Content</div>
</body>
</html>
So to recap, the user will specify their 3 values, which get passed to the function 'renderButton();'.因此,回顾一下,用户将指定他们的 3 个值,这些值将传递给函数“renderButton();”。 What line can I use to change the 3 values of the CSS3 gradient so that the user can make their own custom gradient boxes?
我可以使用哪一行来更改 CSS3 渐变的 3 个值,以便用户可以制作自己的自定义渐变框? I'm assuming its only a line or two that I will need.
我假设我只需要一两行。
PS I realize this example only works in Firefox. PS 我意识到这个例子只适用于 Firefox。 I just want to get the concept down before working on different browsers.
我只想在使用不同的浏览器之前先了解这个概念。
Start with something like the following:从以下内容开始:
var dom = document.getElementById('mainHolder');
dom.style.backgroundImage = '-moz-linear-gradient('
+ orientation + ', ' + colorOne + ', ' + colorTwo + ')';
If you need to support more browsers than Firefox, this will need to be done in combination with either browser-sniffing or some Modernizr-like feature detection.如果您需要支持比 Firefox 多的浏览器,则需要结合浏览器嗅探或一些类似 Modernizr 的功能检测来完成。
Below is an example of how this can be done, using feature-detection similar to Modernizr (tested in Firefox, Chrome, Safari, Opera).下面是一个如何做到这一点的例子,使用类似于 Modernizr 的特征检测(在 Firefox、Chrome、Safari、Opera 中测试)。
// Detect which browser prefix to use for the specified CSS value
// (e.g., background-image: -moz-linear-gradient(...);
// background-image: -o-linear-gradient(...); etc).
//
function getCssValuePrefix()
{
var rtrnVal = '';//default to standard syntax
var prefixes = ['-o-', '-ms-', '-moz-', '-webkit-'];
// Create a temporary DOM object for testing
var dom = document.createElement('div');
for (var i = 0; i < prefixes.length; i++)
{
// Attempt to set the style
dom.style.background = prefixes[i] + 'linear-gradient(#000000, #ffffff)';
// Detect if the style was successfully set
if (dom.style.background)
{
rtrnVal = prefixes[i];
}
}
dom = null;
delete dom;
return rtrnVal;
}
// Setting the gradient with the proper prefix
dom.style.backgroundImage = getCssValuePrefix() + 'linear-gradient('
+ orientation + ', ' + colorOne + ', ' + colorTwo + ')';
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