I am self-studying Vue.js. I am using v-bind to add the highlight class to the span element, which is supposed to add newBorder style to the element, but the style doesn't get applied.
<!DOCTYPE HTML>
<html>
<head>
<title>Intro to v-bind</title>
<meta charset="UTF-8">
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<style>
.container {
background: #cecece;
}
.newBorder {
border: 5px solid yellow;
}
</style>
</head>
<body>
<div id="app">
<img v-bind:src="'assets/images/look.jpg'" v-bind:alt="'illustration of the word -Look-'" v-bind:title="'Look'">
<span v-bind:class="{loadClass,highlight}">
look at me!
</span>
</div>
<script>
var app = new Vue({
el: '#app',
data: {
loadClass: 'container',
highlight: 'newBorder'
}
});
</script>
</body>
</html>
Appreciate it if you can point out my mistake.
Thanks
Just change the class binding the array syntax instead of object :
<span v-bind:class="[loadClass,highlight]">
<!DOCTYPE HTML>
<html>
<head>
<title>Intro to v-bind</title>
<meta charset="UTF-8">
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<style>
.container {
background: #cecece;
}
.newBorder {
border: 5px solid yellow;
}
</style>
</head>
<body>
<div id="app">
<img v-bind:src="'assets/images/look.jpg'" v-bind:alt="'illustration of the word -Look-'" v-bind:title="'Look'">
<span v-bind:class="[loadClass,highlight]">
look at me!
</span>
</div>
<script>
var app = new Vue({
el: '#app',
data: {
loadClass: 'container',
highlight: 'newBorder'
}
});
</script>
</body>
</html>
Related
i'm using bootstrap-vue and i have a multi level drop down menu (for categories) . this is official site example :
https://bootstrap-vue.org/docs/components/dropdown
<b-dropdown id="dropdown-1" text="Dropdown Button" class="m-md-2">
<b-dropdown-item>First Action</b-dropdown-item>
<b-dropdown-item>Second Action</b-dropdown-item>
</b-dropdown>
but i don't know how to create a multi level menu (i copy drop downs inside each other but it does not work) ! it has only 1 level drop down example ! how can i create a multi level one ?
tnx
So as I mentioned in my comments you can wrap b-dropdown events and do something custom like this:
window.onload = () => {
new Vue({
el: '#app',
data() {
return {
name: 'BootstrapVue',
isDropdown2Visible: false
}
},
mounted: function () {
this.$root.$on('bv::dropdown::show', bvEvent => {
if(bvEvent.componentId === 'dropdown-2') {
this.isDropdown2Visible = true;
}
})
this.$root.$on('bv::dropdown::hide', bvEvent => {
if(bvEvent.componentId === 'dropdown-2') {
this.isDropdown2Visible = false;
}
if(this.isDropdown2Visible) {
bvEvent.preventDefault()
}
})
}
})
}
body { padding: 1rem; }
<link type="text/css" rel="stylesheet" href="https://unpkg.com/bootstrap#4.5.3/dist/css/bootstrap.min.css" />
<link type="text/css" rel="stylesheet" href="https://unpkg.com/bootstrap-vue#2.21.2/dist/bootstrap-vue.css" />
<script src="https://unpkg.com/vue#2.6.12/dist/vue.min.js"></script>
<script src="https://unpkg.com/bootstrap-vue#2.21.2/dist/bootstrap-vue.min.js"></script>
<div id="app">
<b-dropdown id="dropdown-1" text="Dropdown Button 1" class="m-md-2">
<b-dropdown-item>First Action 1</b-dropdown-item>
<b-dropdown-item>Second Action 1</b-dropdown-item>
<b-dropdown id="dropdown-2" text="Dropdown Button 2" class="m-md-2">
<b-dropdown-item>First Action 2</b-dropdown-item>
<b-dropdown-item>Second Action 2</b-dropdown-item>
</b-dropdown>
</b-dropdown>
</div>
You can try something like this
This snippet contains logic for one level menu.You can edit code as
per your requirement
JSBin Link
new Vue({
el: "#app",
data: {
menu: [
{ title : 'one'},
{ title : 'two'},
{ title : 'three',showSubMenu : false,
children : [
{ title : 'four'},
{ title : 'five'},
]},
]
},
methods : {
toogleItem(index){
if(this.menu[index].children){
if(!this.menu[index].showSubMenu){
this.menu[index].showSubMenu = true
} else {
this.menu[index].showSubMenu = false
}
}
}
}
})
.sub-menu{
position: absolute;
min-width: 10rem;
padding: .5rem 0;
margin: .125rem 0 0;
font-size: 1rem;
color: #212529;
text-align: left;
list-style: none;
background-color: #fff;
background-clip: padding-box;
border: 1px solid rgba(0,0,0,.15);
border-radius: .25rem;
}
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
<!-- Load required Bootstrap and BootstrapVue CSS -->
<link type="text/css" rel="stylesheet" href="//unpkg.com/bootstrap/dist/css/bootstrap.min.css" />
<link type="text/css" rel="stylesheet" href="//unpkg.com/bootstrap-vue#latest/dist/bootstrap-vue.min.css" />
<!-- Load polyfills to support older browsers -->
<script src="//polyfill.io/v3/polyfill.min.js?features=es2015%2CIntersectionObserver" crossorigin="anonymous"></script>
<!-- Load Vue followed by BootstrapVue -->
<script src="//unpkg.com/vue#latest/dist/vue.min.js"></script>
<script src="//unpkg.com/bootstrap-vue#latest/dist/bootstrap-vue.min.js"></script>
<!-- Load the following for BootstrapVueIcons support -->
<script src="//unpkg.com/bootstrap-vue#latest/dist/bootstrap-vue-icons.min.js"></script>
</head>
<body>
<div id="app">
<b-dropdown id="dropdown-1" text="Dropdown Button" class="m-md-2">
<b-dropdown-item
v-for="(item,index) in menu"
:key="index"
#mouseover.native="toogleItem(index)"
#mouseout.native="toogleItem(index)">
<span>{{item.title}} <b-icon-caret-down-fill :scale="0.6" v-if="item.children"></b-icon-caret-down-fill></span>
<div v-if="item.children" class="sub-menu" v-show="item.showSubMenu">
<b-dropdown-item v-for="(item,index) in item.children" :key="index">{{item.title}}
</b-dropdown-item>
</div>
</b-dropdown-item>
</b-dropdown>
</div>
</body>
</html>
In vue.js we know there are two ways to bind data to a view:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="app">
<p>{{msg}}</p>
<p v-text="msg"></p>
</div>
<script src="./lib/vue.js"></script>
<script>
var vm = new Vue({
el: "#app",
data: {
msg: 'hello world',
}
})
</script>
</body>
</html>
You see the tag p:
<p>{{msg}}</p>
<p v-text="msg"></p>
Is there any difference between them?
There are two differences between them:
If you use the <p>{{msg}}</p> to bind the data, you can add more content, such as:
Hi, {{msg}}!
The <p v-text="msg"></p> can avoid the bind flashing, that mean when you load the view, there will not appear {{msg}} like the first way. If you want to use <p>Hi, {{msg}}!</p> way, you can add the [v-cloak] property:
<style>
[v-cloak] {
display: none;
}
</style>
...
<p v-cloak>{{msg}}</p>
i am new to dojo and i am trying to make a button with an image, but the image does not show, besides, when one clicks the button, it correctly shows the "hi" alert.
the "zoom_in.png" image is right in the same directory with the html. And firebug shows no errors or warnings.
Update. thanks to ed, i managed to get it working via the declarative approach
<!DOCTYPE html>
<html >
<head>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/dojo/1.10.3/dijit/themes/claro/claro.css">
<script>dojoConfig = {parseOnLoad: true}</script>
<script src="//ajax.googleapis.com/ajax/libs/dojo/1.10.3/dojo/dojo.js"></script>
<script>require(["dojo/parser", "dijit/form/Button"]);</script>
<style>
.zoom_in_icon {
background-image: url('zoom_in.png');
height: 25px;
width: 25px;
text-align: center;
background-repeat: no-repeat;
}
</style>
</head>
<body class="claro">
<button data-dojo-type="dijit/form/Button" data-dojo-props="iconClass:'zoom_in_icon'" type="button">
<script type="dojo/on" data-dojo-event="click" data-dojo-args="evt">
require(["dojo/dom"], function(dom){
alert( "Thank you! ");
});
</script>
</button>
<div id="result2"></div>
</body>
</html>
However, programatically, the problem persists
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Button</title>
<script src="//ajax.googleapis.com/ajax/libs/dojo/1.10.3/dojo/dojo.js" data-dojo-config="async: true"></script>
<style>
.zoom_in_icon {
background-image: url('zoom_in.png');
height: 250px;
width: 250px;
text-align: center;
background-repeat: no-repeat;
}
</style>
<script>
require([
"dijit/form/Button",
"dojo/domReady!"
],
function(Button) {
new Button({
title: 'Zoom in', iconClass:'zoom_in_icon',
onClick: function() { alert("hi"); }}, "zoom_in").startup();
});
</script>
</head>
<body>
<button id="zoom_in" type="button"></button>
</body>
</html>
thanks
If you want to create the button programatically you need to call startup() on the new Button, and you don't need the data-dojo-type="dijit/form/Button" or the parse in the html, if you want to create it declaratively you don't need the new button, but you need to set the icon in the html.
See the Programatic example here:
http://dojotoolkit.org/reference-guide/1.10/dijit/form/Button.html
Hi I have a simple one as shown below that displays bordercontainer and contentpane.
I do not understand why the bordercontainer's id is registered twice since I only have one
id defined for bordercontainer.
The error stated: Error: Tried to register widget with id==main_bContainer but that id is already registered
Please advise where I got it wrong.
<!DOCTYPE html>
<html>
<head>
<title>Hello</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link rel="stylesheet" href="../dojo1_8/dijit/themes/soria/soria.css"/>
<link rel="stylesheet" href="../common.css"/>
<style type="text/css">
html, body
{
width: 100%;
height: 100%;
margin: 5px;
padding: 0px;
overflow: hidden;
}
</style>
</head>
<body class="soria">
<div id="main_bContainer" data-dojo-type="dijit/layout/BorderContainer" data-dojo-props="design:'sidebar'">
<div class="cP_Left" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'center'">
Content Pane A
</div>
<div class="cP_Right" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'right'">
Content Pane B
</div>
</div>
</body>
<script>
var dojoConfig =
{
parseOnLoad: true,//replace web controls based on theme soria
isDebug: true,//true for debuggin with aid from FireBug, Always set it to false, to avoid overhead
async: true,//
locale : "en-us"//
};
</script>
<script src='../dojo1_8/dojo/dojo.js'></script>
<script>require(["dojo/parser",
"dojo/ready",
"dojo/request",
"dijit/layout/BorderContainer",
"dijit/layout/ContentPane",
"dojo/domReady!"
], function(parser, ready, request)
{ready(function()
{parser.parse();
});
});
</script>
</html>
Thanks
Clement
Becuase you have parse() its 2 times.
Here dojoConfig = { parseOnLoad: true };
and here parser.parse();
Just parse only one the problem will solve.
I copied an example from the dojo site using Borderlayout. However, when I load in the browser , the entire data is shown for all the section . Then after a few second the content is refersh and the data is displayed correctly.
here is code that i copied . Thanks for your help
<head>
<link rel="stylesheet" type="text/css" href="http://ajax.googleapis.com/ajax/libs/dojo/1.3/dijit/themes/tundra/tundra.css">
<style type="text/css">
body, html { font-family:helvetica,arial,sans-serif; font-size:90%; }
</style>
<style type="text/css">
html, body { width: 100%; height: 100%; margin: 0; } #borderContainer
{ width: 100%; height: 100%; }
</style>
</head>
<body class="tundra ">
<div dojoType="dijit.layout.BorderContainer" design="sidebar" gutters="true"
liveSplitters="true" id="borderContainer">
<div dojoType="dijit.layout.ContentPane" splitter="true" region="leading"
style="width: 100px;">
Hi
</div>
<div dojoType="dijit.layout.ContentPane" splitter="true" region="center">
Hi, I'm center
</div>
</div>
</body>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/dojo/1.3/dojo/dojo.xd.js"
djConfig="parseOnLoad: true">
</script>
<script type="text/javascript">
dojo.require("dijit.layout.ContentPane");
dojo.require("dijit.layout.BorderContainer");
</script>
<!-- NOTE: the following script tag is not intended for usage in real
world!! it is part of the CodeGlass and you should just remove it when
you use the code -->
<script type="text/javascript">
dojo.addOnLoad(function() {
if (window.pub) {
window.pub();
}
});
</script>
This looks a bit upside down : you should put your javascripts in the head section and load the dojo libraries in first place. That's not your problem though.
What happens is that when the page loads, dojo loads all the modules that you "dojo.require", then parses all your tags containing the attribute "dojoType" and processes them for rendering, and this takes time.
So the flickering that you're seeing is the difference between the page before and after the widgets are parsed.
You should add a preloader div and hide it once the page is parsed (see this example).
This is what it would look like for your example :
<html>
<head>
<title>Preloader example</title>
<!– every Dijit component needs a theme –>
<link rel="stylesheet"
href="http://o.aolcdn.com/dojo/1.4/dijit/themes/soria/soria.css">
<style type="text/css">
#preloader,
body, html {
width:100%; height:100%; margin:0; padding:0;
}
#preloader {
width:100%; height:100%; margin:0; padding:0;
background:#fff
url(’http://search.nj.com/media/images/loading.gif’)
no-repeat center center;
position:absolute;
z-index:999;
}
#borderContainer {
width:100%; height:100%;
}
</style>
<!– load Dojo, and all the required modules –>
<script src="http://o.aolcdn.com/dojo/1.4/dojo/dojo.xd.js"></script>
<script type="text/javascript">
var hideLoader = function(){
dojo.fadeOut({
node:"preloader",
onEnd: function(){
dojo.style("preloader", "display", "none");
}
}).play();
}
dojo.addOnLoad(function(){
// after page load, load more stuff (spinner is already spinning)
dojo.require("dijit.layout.BorderContainer");
dojo.require("dijit.layout.ContentPane");
dojo.require("dojo.parser");
// notice the second onLoad here:
dojo.addOnLoad(function(){
dojo.parser.parse();
hideLoader();
});
});
</script>
</head>
<body class="soria">
<div id="preloader"></div>
<div dojoType="dijit.layout.BorderContainer" id="borderContainer" design="sidebar" gutters="true" liveSplitters="true">
<div dojoType="dijit.layout.ContentPane" splitter="true" region="leading" style="width: 100px;">Hi</div>
<div dojoType="dijit.layout.ContentPane" splitter="true" region="center">I'm Center</div>
</div>
</body>
</html>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/dojo/1.3/dojo/dojo.xd.js"></script>
if(dojo.isIE){
addEvent(window, 'load', function(event) {
dojo.parser.parse();
});
}else{
dojo.addOnLoad(function(){
dojo.addOnLoad(function(){
dojo.parser.parse();
});
});
}
function addEvent( obj, type, fn ) {
if ( obj.attachEvent ) {
obj['e'+type+fn] = fn;
obj[type+fn] = function(){obj['e'+type+fn]( window.event );}
obj.attachEvent( 'on'+type, obj[type+fn] );
} else
obj.addEventListener( type, fn, false );
}
disable parseOnLoad and manually add event to parse widgets for ie.