angular.js元素没有方法querySelector

Question

我试图从我的指令中获取角度的子元素作为对象,所以我有

link: function(scope,elem,attrs){
    var resizeBar = elem.querySelector('.resize-bar');

当我输出时elem,我有一个html对象.但是,我得到一个错误`对象[对象对象]没有方法'querySelector'.

我可以使用元素

   var resizeBar = elem.children().children()[1];

但是输出为

<div class="resize-bar">Move</div>

这不是我需要的,我需要resize-bar的html对象.

有人知道一个很好的方法来做角度吗？

elem的控制台输出是

: div.favor-layout.favor-layout-sideways
accessKey: ""
align: ""
attributes: NamedNodeMap
baseURI: "file:///C:/Users/pete/projects/favor/favor-layout/index.html"
childElementCount: 1
childNodes: NodeList[2]
children: HTMLCollection[1]
classList: DOMTokenList
className: "favor-layout favor-layout-sideways"
clientHeight: 200
clientLeft: 0
clientTop: 0
clientWidth: 913
contentEditable: "inherit"
dataset: DOMStringMap
dir: ""
draggable: false
firstChild: div.favor-layout-container
firstElementChild: div.favor-layout-container
hidden: false
id: ""
innerHTML: "?   ?          This gets wrapped.?     ? move??"
innerText: "This gets wrapped.?move"
isContentEditable: false
lang: ""
lastChild: text
lastElementChild: div.favor-layout-container
localName: "div"
namespaceURI: "http://www.w3.org/1999/xhtml"
nextElementSibling: null
nextSibling: text
nodeName: "DIV"
nodeType: 1
nodeValue: null
offsetHeight: 200
offsetLeft: 8
offsetParent: body.ng-scope
offsetTop: 8
offsetWidth: 913
onabort: null
onbeforecopy: null
onbeforecut: null
onbeforepaste: null
onblur: null
oncancel: null
oncanplay: null
oncanplaythrough: null
onchange: null
onclick: null
onclose: null
oncontextmenu: null
oncopy: null
oncuechange: null
oncut: null
ondblclick: null
ondrag: null
ondragend: null
ondragenter: null
ondragleave: null
ondragover: null
ondragstart: null
ondrop: null
ondurationchange: null
onemptied: null
onended: null
onerror: null
onfocus: null
oninput: null
oninvalid: null
onkeydown: null
onkeypress: null
onkeyup: null
onload: null
onloadeddata: null
onloadedmetadata: null
onloadstart: null
onmousedown: null
onmouseenter: null
onmouseleave: null
onmousemove: null
onmouseout: null
onmouseover: null
onmouseup: null
onmousewheel: null
onpaste: null
onpause: null
onplay: null
onplaying: null
onprogress: null
onratechange: null
onreset: null
onscroll: null
onsearch: null
onseeked: null
onseeking: null
onselect: null
onselectstart: null
onshow: null
onstalled: null
onsubmit: null
onsuspend: null
ontimeupdate: null
onvolumechange: null
onwaiting: null
onwebkitfullscreenchange: null
onwebkitfullscreenerror: null
onwheel: null
outerHTML: "?   ?          This gets wrapped.?     ? move??"
outerText: "This gets wrapped.?move"
ownerDocument: document
parentElement: body.ng-scope
parentNode: body.ng-scope
prefix: null
previousElementSibling: null
previousSibling: text
scrollHeight: 200
scrollLeft: 0
scrollTop: 0
scrollWidth: 913
spellcheck: true
style: CSSStyleDeclaration
tabIndex: -1
tagName: "DIV"
textContent: "? ?           This gets wrapped.?     ?   move??"
title: ""
translate: true
webkitPseudo: ""
webkitShadowRoot: null
webkitdropzone: ""
__proto__: HTMLDivElement
context: div.favor-layout.favor-layout-sideways
length: 1
__proto__: Object[0]

Answer 1

试试这个,返回值是元素,而不是角度元素.

var resizeBar = elem[0].querySelector('.resize-bar');

Answer 2

如果你想找到驻留在元素中的指令的模板,您可以在内部使用这个link功能:

var divElement = angular.element(element[0].querySelector('#find-me'));

它会寻找#find-meid.但它只会在你的指令模板中这样做.因此,它不会返回任何在指令之外具有相同id的元素,就像document.querySelector("#find-me")那样.

所以,如果你在一个指令中使用它,它将如下所示:

angular.module('app').directive('myDirective', function(){
    return{
        link: function(scope, element, attributes){
            var divElement = angular.element(element[0].querySelector('#find-me'));
        },
        template: function(element, attributes){
            return '<div id="find-me">' +
                        'Look at my directive' +
                    '</div>';
        }
    }
});

Answer 3

.querySelector()是 的一种方法document。不过，既然你已经elem开始了，你可以这样做：

var currentElemClass = "." + elem.className.replace(/\s/g, ".") + " ";
var resizeBar = document.querySelector(currentElemClass + ".resize-bar");

它的作用是获取当前元素的类名，然后将其添加到 的开头，document.querySelector以便您获得准确的查询。

举个例子，将其应用于div.favor-layout.favor-layout-sideways，currentElemClass就变成.favor-layout.favor-layout-sideways，所以最后你会得到：

document.querySelector(".favor-layout.favor-layout-sideways .resize-bar");

这是一个有效的查询。