我正在使用angular-treeview directive。在这里，加载树需要一些时间，所以我想在那个时候展示一个微调器。所以，我想在指令中定义一个变量，并在视图中使用，以便我可以显示一个微调器。
**angular-treeview.js**
(function ( angular ) {
'use strict';
angular.module( 'angularTreeview', [] ).directive( 'treeModel', ['$compile', function( $compile) {
return {
restrict: 'A',
link: function ( scope, element, attrs ) {
//tree id
var treeId = attrs.treeId;
//tree model
var treeModel = attrs.treeModel;
//node id
var nodeId = attrs.nodeId || 'id';
//node label
var nodeLabel = attrs.nodeLabel || 'label';
//node class
var nodeClass = attrs.nodeClass || 'type';
//children
var nodeChildren = attrs.nodeChildren || 'children';
//search by label
var searchQuery = attrs.searchQuery || '';
//function for highlighting search text
var searchHighlightFunction = attrs.searchHighlightFunction ||
function (content, text) {
return content
};
//css class to be added for highlighting
var searchHighlightClassName = attrs.searchHighlightClassName || '';
//filter to be used with search query
var searchFilter = attrs.searchFilter || '';
//tree template
var template =
'<ul>' +
'<li data-ng-repeat="node in ' + treeModel + '| ' + searchFilter + ':' + searchQuery + '" data-ng-init="node.collapsed=true">' +
'<i class="collapsed {{node.' + nodeClass + '}}" data-ng-show="node.' + nodeChildren + '.length && node.collapsed" data-ng-click="' + treeId + '.selectNodeHead(node)"></i>' +
'<i class="expanded {{node.' + nodeClass + '}}" data-ng-show="node.' + nodeChildren + '.length && !node.collapsed" data-ng-click="' + treeId + '.selectNodeHead(node)"></i>' +
'<i class="normal {{node.' + nodeClass + '}}" data-ng-hide="node.' + nodeChildren + '.length"></i> ' +
'<span data-ng-class="node.selected" data-ng-click="' + treeId + '.selectNodeLabel(node)" ' +
'ng-bind-html="' + searchHighlightFunction + '(node.' + nodeLabel + ', ' + searchQuery + ', \'' + searchHighlightClassName + '\', true)"></span>' +
'<div data-ng-hide="node.collapsed" data-tree-id="' + treeId + '" data-tree-model="node.' + nodeChildren +
'" data-node-id=' + nodeId + ' data-node-label=' + nodeLabel + ' data-node-children="' + nodeChildren + '"' +
' data-node-class="' + nodeClass + '" data-search-query="' + searchQuery + '" data-search-highlight-function="' + searchHighlightFunction + '"' +
' data-search-highlight-class-name="' + searchHighlightClassName + '" data-search-filter="' + searchFilter + '"></div>' +
'</li>' +
'</ul>';
//check tree id, tree model
if( treeId && treeModel ) {
/*
* to expand or collapse nodes on search text changes
*/
scope.$watch(searchQuery, function (newVal, oldVal) {
var node = scope.node;
if (newVal) {
if (newVal.length > 0) {
if (node) {
if ((node[nodeChildren] && node[nodeChildren].length)
|| (node[nodeChildren] && node[nodeChildren].length)) {
node.collapsed = false;
}
}
}
} else {
if (node && ((node[nodeChildren] && node[nodeChildren].length)
|| (node[nodeChildren] && node[nodeChildren].length))) {
node.collapsed = (scope[treeId].expandedNodes.indexOf(node[nodeLabel]) < 0);
}
}
});
//root node
if( attrs.angularTreeview ) {
//create tree object if not exists
scope[treeId] = scope[treeId] || {};
//this is where we are storing nodes by user to distinguish between
// those expanded by user from those done for showing search results
scope[treeId].expandedNodes = [];
scope.$watch(treeModel, function(newVal, oldVal) {
if (newVal) {
scope[treeId].expandedNodes = [];
}
});
//if node head clicks,
scope[treeId].selectNodeHead = scope[treeId].selectNodeHead || function( selectedNode ){
var expandedNodesIndex;
//Collapse or Expand
selectedNode.collapsed = !selectedNode.collapsed;
expandedNodesIndex = scope[treeId].expandedNodes.indexOf(selectedNode[nodeLabel]);
if (expandedNodesIndex > -1) {
if (selectedNode.collapsed) {
scope[treeId].expandedNodes.splice(expandedNodesIndex, 1);
}
} else {
if (!selectedNode.collapsed) {
scope[treeId].expandedNodes.push(selectedNode[nodeLabel]);
}
}
};
//if node label clicks,
scope[treeId].selectNodeLabel = scope[treeId].selectNodeLabel || function( selectedNode ){
//remove highlight from previous node
if( scope[treeId].currentNode && scope[treeId].currentNode.selected ) {
scope[treeId].currentNode.selected = undefined;
}
//set highlight to selected node
selectedNode.selected = 'selected';
//set currentNode
scope[treeId].currentNode = selectedNode;
};
}
//Rendering template.
element.html('').append( $compile( template )( scope ) );
}
}
};
}]);
})( angular );
我的HTML是 -
<div data-angular-treeview="true" data-tree-id="Treevalue"
data-tree-model="suggestionList" data-node-id="id" data-node-class="type" data-node-label="name"
data-node-children="childrens" data-search-query="suggestionListSearchText" data-search-highlight-function="highlightHTML"
data-search-highlight-class-name="searchText" data-search-filter="NameFilter">
</div>
那么，如何在该指令中定义变量并在范围内使用它？
答案 0 :(得分：0)
查看代码，可能就像在div中添加带有data-tree-view的HTML一样简单。该HTML将作为树视图指令的一部分进行擦除，因此您在其中添加的任何内容（如微调器）都将显示，直到指令完成。
编辑：
在树视图div中添加图像。此HTML将被清除，因此只会在加载时显示。
<div data-angular-treeview="true" data-tree-id="Treevalue"
data-tree-model="suggestionList" data-node-id="id" data-node-class="type" data-node-label="name"
data-node-children="childrens" data-search-query="suggestionListSearchText" data-search-highlight-function="highlightHTML"
data-search-highlight-class-name="searchText" data-search-filter="NameFilter">
<img src="spinner.gif">
</div>