我已将d3树从v3.5迁移到v5。现在，我发现使用Patrick Brockmann’s search and highlight functionality在树上执行搜索时，v5版本存在相当大的滞后。
使用下拉Select2进行搜索时，将显示延迟。在v5版本中，所有叶节点的扩展速度都不够快，导致几秒钟的大量黑色文本。在v3.5版本中不会发生这种情况。
有什么想法可以优化它以获得与树的v3.5版本相同的性能吗？两个版本中的JSON数据相同。
d3 v3.5 fiddle
d3 v5 fiddle
搜索功能中的代码（v3.5和v5版本均相同）：
function select2DataCollectName( d ) {
if ( d.children )
d.children.forEach( select2DataCollectName );
else if ( d._children )
d._children.forEach( select2DataCollectName );
if ( !d.children && d.data.type == 'learning_event' ) select2Data.push( d.data.name );
}
//===============================================
function searchTree( d ) {
if ( d.children )
d.children.forEach( searchTree );
else if ( d._children )
d._children.forEach( searchTree );
var searchFieldValue = eval( searchField );
if ( searchFieldValue && searchFieldValue.toLowerCase().match( searchText.toLowerCase() ) ) {
// Walk parent chain
var ancestors = [];
var parent = d;
while ( parent !== null && typeof ( parent ) !== "undefined" ) {
ancestors.push( parent );
//console.log(parent);
parent.class = "found";
parent = parent.parent;
}
}
}
//===============================================
function clearAll( d ) {
d.class = "";
if ( d.children )
d.children.forEach( clearAll );
else if ( d._children )
d._children.forEach( clearAll );
}
//===============================================
function collapse( d ) {
if ( d.children ) {
d._children = d.children;
//set the parent object in all the children
d._children.forEach( function ( d1 ) {
d1.parent = d;
collapse( d1 );
} );
d.children = null;
}
}
//===============================================
function collapseAllNotFound( d ) {
if ( d.children ) {
if ( d.class !== "found" ) {
d._children = d.children;
d._children.forEach( collapseAllNotFound );
d.children = null;
} else
d.children.forEach( collapseAllNotFound );
}
}
//===============================================
function expandAll( d ) {
if ( d._children ) {
d.children = d._children;
d.children.forEach( expandAll );
d._children = null;
} else if ( d.children )
d.children.forEach( expandAll );
}
//===============================================
// Toggle children on click.
function toggle( d ) {
if ( d.children ) {
d._children = d.children;
d.children = null;
} else {
d.children = d._children;
d._children = null;
}
clearAll( root );
update( d );
$( "#search" ).select2( "val", "" );
}
//===============================================
$( "#search" ).on( "select2-selecting", function ( e ) {
clearAll( root );
expandAll( root );
update( root );
searchField = "d.data.name";
searchText = e.object.text;
searchTree( root );
root.children.forEach( collapseAllNotFound );
update( root );
} )
var colourScale = d3.scaleOrdinal()
.domain(["MD", "Year 1", "Year 2", "Year 3", "Year 4"])
.range(["#abacab", "#53e28c", "#4b80fa", "#eab014", "#bd57fe"]);
// Set the dimensions and margins of the diagram
var margin = {top: 20, right: 90, bottom: 30, left: 0},
width = 2000 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
// append the svg object to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
var svg = d3.select("body").append("svg")
.attr("width", width + margin.right + margin.left)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" +
margin.left + "," + margin.top + ")");
var i = 0,
duration = 750,
root;
// declares a tree layout and assigns the size
var treemap = d3.tree().size([height, width]);
// Assigns parent, children, height, depth
root = d3.hierarchy(treeData, function(d) {
return d.children;
});
root.x0 = height / 2;
root.y0 = 0;
// Collapse after the second level
root.children.forEach(collapse);
update(root);
select2Data = [];
select2DataCollectName( root );
select2DataObject = [];
select2Data.sort( function ( a, b ) {
if ( a > b ) return 1; // sort
if ( a < b ) return -1;
return 0;
} )
.filter( function ( item, i, ar ) {
return ar.indexOf( item ) === i;
} ) // remove duplicate items
.filter( function ( item, i, ar ) {
select2DataObject.push( {
"id": i,
"text": item
} );
} );
$( "#search" ).select2( {
placeholder: "Select a Learning Event...",
data: select2DataObject,
containerCssClass: "search"
} );
最佳答案
您的标题是clickbait，因为两个版本之间的性能没有任何区别。听起来好像您正在报告回归。 :)
正如@RobertHarvey指出的，不同之处在于文本在输入时不会从透明淡入。从D3v3到D3v5移植代码时，您似乎错过了fill-opacity
nodeEnter.append('text')
// ...
.style( "fill-opacity", 1e-6 )
和
var nut = nodeUpdate.transition()
// ...
nut.select( "text" )
.style( "fill-opacity", 1 );
Fork of your d3v5 fiddle。