我对 konva.js 中的 Zindex 有疑问。在我将所有内容添加到图层之后 我正在尝试分别为每个元素的节点分配一个属性。但它不起作用。例如
for(let i = 0; i<=this.layer['children']; i++){
this.layer['children'][i].setZIndex(someInt);
}
如何为层中的所有元素设置 zindex？
【问题讨论】：
标签： konvajs
zIndex in Konva 只是父元素的子元素数组中元素的索引。所以你不能给它设置任何数字，它不能大于children.length - 1。
【讨论】：
工作 sn-p 说明 Kovajs.Shape 对象的 getZIndex()、setZIndex()、moveUp() 和 moveDown() 方法。另见example at Konvajs site。
按钮允许使用以 1 为增量在 z-index 列表中上下移动绿色圆圈，然后还可以尝试向上移动 +10 和向下移动 -100。生成的 z-index 显示在圆圈下方的文本中。
// Create the stage
var stage = new Konva.Stage({
container: 'container',
width: $('#container').width(),
height: $('#container').height()
});
// create the layer
var layer = new Konva.Layer();
var data = [ {x: 60, color: 'red'}, {x: 90, color: 'limegreen'}, {x: 120, color: 'gold'}]
var circles = [];
for (var i = 0; i < data.length; i = i + 1){
// create some circles
var circle = new Konva.Circle({
x: data[i].x,
y: 60,
radius: 50,
fill: data[i].color,
stroke: 'black',
strokeWidth: 2
});
layer.add(circle);
circles.push(circle);
}
stage.add(layer);
var green = circles[1];
function sayIndex(){
$('#info').html("Green zIndex=" + circles[1].getZIndex());
}
$('#greenup').on('click', function(){
green.moveUp();
sayIndex();
layer.draw();
})
$('#greendn').on('click', function(){
green.moveDown();
sayIndex();
layer.draw();
})
$('#greenup10').on('click', function(){
var ind = circles[1].getZIndex();
green.setZIndex(ind + 10);
sayIndex();
layer.draw();
})
$('#greendn100').on('click', function(){
var ind = circles[1].getZIndex();
green.setZIndex(ind - 100);
sayIndex();
layer.draw();
})#container
{
width: 200px;
height: 150px;
border: 1px solid #666;
float: left;
}
#buttons
{
width: 200px;
height: 150px;
border: 1px solid #666;
float: left;
}
#info
{
position: absolute;
left: 20px;
top: 135px;
}
p
{
margin: 10px;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<script src="https://cdn.rawgit.com/konvajs/konva/1.6.5/konva.min.js"></script>
<div id="container"></div>
<div id="buttons">
<p><button id='greenup'>Move Green + 1</button></p>
<p><button id='greendn'>Move Green -1</button></p>
<p><button id='greenup10'>Move Green +10</button></p>
<p><button id='greendn100'>Move Green -100</button></p>
<span id='info'></span>
</div>【讨论】：
<!DOCTYPE html>
<html>
<head>
<script src="https://unpkg.com/konva@2.4.2/konva.min.js"></script>
<meta charset="utf-8">
<title>Konva Shape Layering Demo</title>
<style>
body {
margin: 0;
padding: 0;
overflow: hidden;
background-color: #F0F0F0;
}
#buttons {
position: absolute;
left: 10px;
top: 0px;
}
button {
margin-top: 10px;
display: block;
}
</style>
</head>
<body>
<div id="container"></div>
<div id="buttons">
<button id="toTop">
yellow z-index -2
</button>
<button id="toBottom">
yellow -9
</button>
<button id="up">
yellow z-index 1
</button>
<button id="down">
yellow z-index -5
</button>
<button id="zIndex">
Set yellow box zIndex to 3
</button>
</div>
<script>
var width = window.innerWidth;
var height = window.innerHeight;
var stage = new Konva.Stage({
container: 'container',
width: width,
height: height
});
var layer = new Konva.Layer();
var offsetX = 0;
var offsetY = 0;
var colors = ['red', 'orange', 'yellow', 'green', 'blue', 'purple'];
var yellowBox = null;
for(var n = 0; n < 6; n++) {
// anonymous function to induce scope
(function() {
var i = n;
var box = new Konva.Rect({
x: i * 30 + 210,
y: i * 18 + 40,
width: 100,
height: 50,
fill: colors[i],
stroke: 'black',
strokeWidth: 4,
draggable: true,
name: colors[i]
});
box.on('mouseover', function() {
document.body.style.cursor = 'pointer';
});
box.on('mouseout', function() {
document.body.style.cursor = 'default';
});
if(colors[i] === 'yellow') {
yellowBox = box;
}
layer.add(box);
})();
}
stage.add(layer);
// add button event bindings
document.getElementById('toTop').addEventListener('click', function() {
yellowBox.setZIndex(-2);
layer.draw();
}, false);
document.getElementById('toBottom').addEventListener('click', function() {
yellowBox.setZIndex(-9);
layer.draw();
}, false);
document.getElementById('up').addEventListener('click', function() {
yellowBox.setZIndex(1);
layer.draw();
}, false);
document.getElementById('down').addEventListener('click', function() {
yellowBox.setZIndex(-5);
layer.draw();
}, false);
document.getElementById('zIndex').addEventListener('click', function() {
yellowBox.setZIndex(3);
layer.draw();
}, false);
</script>
</body>
</html>
Last有趣的 ZIndex 代码，
setZIndex 就是您所需要的；它将使 Konva.JS 中的 z-index 无效
【讨论】：