I'm currently developing a web application utilizing zTree library. The tree structure is populated with data retrieved from a Golang backend server. Each leaf node in the tree should have custom icons that can change dynamically while the application is running. How can I achieve this icon customization based on backend data without having to refresh the entire page?
Using http-equiv="refresh" for automatic page refresh causes annoying blinking and loss of focus. Below is a working example with zTree where the page does refresh, but it blinks (I omitted the backend-related part for simplicity):
<HTML>
<HEAD>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta http-equiv="refresh" content="5">
<link rel="stylesheet" href="../static/css/zTreeStyle/zTreeStyle.css" type="text/css">
<script type="text/javascript" src="../static/js/jquery-1.4.4.min.js"></script>
<script type="text/javascript" src="../static/js/jquery.ztree.core.js"></script>
</HEAD>
<BODY>
<div id="app">
<TABLE>
<TR>
<TD width=260px valign=top>
<ul id="tree" class="ztree"></ul>
</TD>
<TD valign=top>
<p>Some text</p>
</TD>
</TR>
</TABLE>
<SCRIPT type="text/javascript">
var zTree;
var setting = {
data: {
simpleData: {
enable: true,
idKey: "id",
pIdKey: "pId",
rootPId: ""
}
}
};
var zNodes = [
{id: 1, pId: 0, name: "root", icon:"../static/css/zTreeStyle/img/diy/c16green.png"},
{id: 2, pId: 1, name: "leaf", icon:"../static/css/zTreeStyle/img/diy/c16red.png"},
];
$(document).ready(function () {
var t = $("#tree");
t = $.fn.zTree.init(t, setting, zNodes);
});
</script>
</div>
</BODY>
</HTML>
I attempted to incorporate Vue.js for data binding to zTree nodes, but encountered difficulties. Here is a non-functional sample using Vue.js for data binding within a script tag:
<HTML>
<HEAD>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link rel="stylesheet" href="../static/css/zTreeStyle/zTreeStyle.css" type="text/css">
<script type="text/javascript" src="../static/js/jquery-1.4.4.min.js"></script>
<script type="text/javascript" src="../static/js/jquery.ztree.core.js"></script>
<script src="https://unpkg.com/vue"></script>
</HEAD>
<BODY>
<div id="app">
<TABLE>
<TR>
<TD width=260px valign=top>
<ul id="tree" class="ztree"></ul>
</TD>
<TD valign=top>
<p>{{ now }}</p>
<p>Some text</p>
</TD>
</TR>
</TABLE>
<SCRIPT type="text/javascript">
var zTree;
var setting = {
data: {
simpleData: {
enable: true,
idKey: "id",
pIdKey: "pId",
rootPId: ""
}
}
};
var zNodes = [
{id: 1, pId: 0, name: "root", icon:"../static/css/zTreeStyle/img/diy/c16green.png"},
{id: 2, pId: 1, name: "leaf", icon:"../static/css/zTreeStyle/img/diy/c16red.png"},
{id: 3, pId: 1, name: "foo", icon: {{ customIcon }} },
];
$(document).ready(function () {
var t = $("#tree");
t = $.fn.zTree.init(t, setting, zNodes);
});
const app = new Vue({
el: '#app',
data: {
now: new Date(),
customIcon : "../static/css/zTreeStyle/img/diy/c16green.png"
},
methods: {
updateDate() {
this.now = new Date();
}
},
mounted() {
setInterval(() => {
this.updateDate();
}, 1000);
},
})
</script>
</div>
</BODY>
</HTML>
You can access the zipped sample containing these examples in the template directory here: https://drive.google.com/file/d/1Ihv8jLdsEz93aUrFjEugD1l6YvslaUT8