详解js中构造流程图的核心技术JsPlumb（2）

前言：上篇详解js中构造流程图的核心技术JsPlumb介绍了下JsPlumb在浏览器里面画流程图的效果展示，以及简单的JsPlumb代码示例。这篇还是接着来看看各个效果的代码说明。
一、设置连线的样式和颜色效果代码示例 大概的效果如图：

这些效果看着很简单，那么，我们如何用代码去实现它呢。上章我们说过，JsPlumb的连线样式是由点的某些属性决定的，既然如此，我们就通过设置点的样式来动态改变连线的样式即可。来看代码：
首先来看看连线类型的那个select


<div id="btn_linetype" class="divMenuBtn btn-default btn">
连线类型：
　　<select id="sel_linetype" style="width:80px;height:20px">
　　　　<option value="2">直线</option>
　　　　<option value="1">折线</option>
　　　　<option value="3">曲线</option>
　　</select>
</div>


在页面初始化的时候注册select的change事件


//全局的空心圆端点样式设置
var hollowCircle = {
DragOptions: { cursor: 'pointer', zIndex: 2000 },
endpoint: ["Dot", { radius: 7 }], //端点的形状
connectorStyle: connectorPaintStyle,//连接线的颜色，大小样式
connectorHoverStyle: connectorHoverStyle,
paintStyle: {
strokeStyle: "#1e8151",
fillStyle: "transparent",
radius: 5,
lineWidth: 2
}, //端点的颜色样式
//anchor: "AutoDefault",
isSource: true, //是否可以拖动（作为连线起点）
connector: ["Straight", { stub: [0, 0], gap: 10, cornerRadius: 5, alwaysRespectStubs: true }], //连接线的样式种类有[Bezier],[Flowchart],[StateMachine ],[Straight ]
isTarget: true, //是否可以放置（连线终点）
maxConnections: -1, // 设置连接点最多可以连接几条线
connectorOverlays: [["Arrow", { width: 10, length: 10, location: 1 }]]
};

//页面初始化完成之后
$(function () {
//连线样式下拉框的change事件
$("#sel_linetype").change(function () {
var strlinetype = "";
var strlinecolor = "";
//设置新添加元素的节点的连线样式
//直线的样式和样色
if ($(this).val() == "1") {
strlinetype = "Flowchart";
strlinecolor = "red";
hollowCircle.connector = ["Flowchart", { stub: [0, 0], gap: 10, cornerRadius: 5, alwaysRespectStubs: true }];
}
//折线的样式和颜色
else if ($(this).val() == "2") {
strlinetype = "Straight";
strlinecolor = "green";
hollowCircle.connector = ["Straight", { stub: [0, 0], gap: 10, cornerRadius: 5, alwaysRespectStubs: true }];
}
//曲线的样式和颜色
else if ($(this).val() == "3") {
strlinetype = "Bezier";
strlinecolor = "orange";
hollowCircle.connector = ["Bezier", { stub: [0, 0], gap: 10, cornerRadius: 5, alwaysRespectStubs: true }];
}
//设置已经存在的所有的连接点的连线样式
var arrnode = $("#divCenter").find(".node");
for (var i = 0; i < arrnode.length; i++) {
var arrendpoints = jsPlumb.getEndpoints($(arrnode[i]).attr("id"));
if (arrendpoints == undefined || arrendpoints == null) {
return;
}
var oconnector = arrendpoints[0].connector;
if (oconnector == null || oconnector == undefined) {
return;
}
oconnector[0] = strlinetype;
var oconnectstyle = arrendpoints[0].connectorStyle;
if (oconnectstyle == null || oconnectstyle == undefined) {
return;
}
oconnectstyle.strokeStyle = strlinecolor;
}
});
});


其实也就几行代码，设置已经存在和将要拖动到界面上面的端点的连线样式。 二、全选、全选拖动效果代码示例 可以选中元素，批量拖动元素和连线，大概效果：


看看实现代码： 1、初始化的时候注册可选中


$(function () {
var oRegionSelect = new RegionSelect({
region: '#divCenter div.node',
selectedClass: 'seled',
parentId: "divCenter"
});
oRegionSelect.select();
});


 2、选中相关方法


var _selectedRegions = [];
//var selProp;

function RegionSelect(selRegionProp) {
//selProp = selRegionProp;
this.regions = [];
this.selProp = selRegionProp;
this.InitRegions(selRegionProp);
this.selectedClass = selRegionProp["selectedClass"];
this.selectedRegion = [];
this.selectDiv = null;
this.startX = null;
this.startY = null;
this.parentId = selRegionProp["parentId"];
}

RegionSelect.prototype.InitRegions = function () {
var _self = this;
_self.regions = [];
var _regions = document.getElementsBySelector(_self.selProp["region"]);//$("#divCenter > .node");//

var bSelect = true;
if (_regions && _regions.length > 0) {
for (var i = 0; i < _regions.length; i++) {
_regions[i].onmousedown = function () {
bSelect = false;
var evt = window.event || arguments[0];
if (!evt.shiftKey && !evt.ctrlKey) {
if ($.inArray(this, _selectedRegions) === -1) {
// 清空所有select样式
_self.clearSelections(_regions);
this.className += " " + _self.selectedClass;
// 清空selected数组，并加入当前select中的元素
_selectedRegions = [];
_selectedRegions.push(this);
}
} else {
if (this.className.indexOf(_self.selectedClass) == -1) {
this.className += " " + _self.selectedClass;
_selectedRegions.push(this);
} else {
this.className = this.className.replaceAll(_self.selectedClass, "");
_selectedRegions.remove(this);
}
}
clearEventBubble(evt);
}
this.regions.push(_regions[i]);
}
}

if (bSelect) {
// 清空所有select样式
_self.clearSelections(_regions);
// 清空selected数组，并加入当前select中的元素
_selectedRegions = [];
}
}

RegionSelect.prototype.select = function () {
var _self = this;
var sDivId = _self.parentId;
var intMousePosition = [0, 0];
var intOriginalPosition = [0, 0];
var parentWidth = parseInt(document.getElementById(sDivId).parentElement.offsetWidth);
var parentHeight = parseInt(document.getElementById(sDivId).parentElement.offsetHeight);
addEvent("mousedown", function () {
var evt = window.event || arguments[0];
var buttonType = evt.buttons || evt.button;
if (evt.target != undefined) {
if (evt.target.id !== sDivId) return;
}
if (evt.srcElement != undefined) {
if (evt.srcElement.id !== sDivId) return;
}
if (evt.buttons == undefined && buttonType == 0){
_self.onBeforeSelect(evt, sDivId);
}
if (buttonType === 1) {
_self.onBeforeSelect(evt, sDivId);
}
if (buttonType === 2) {
intMousePosition = [evt.clientX, evt.clientY];
var movX = parseInt(GetStyle(document.getElementById(sDivId), "left"));
var movY = parseInt(GetStyle(document.getElementById(sDivId), "top"));
intOriginalPosition = [movX, movY];
document.getElementById(sDivId).style.cursor = "move";
}
clearEventBubble(evt);
}, document);

addEvent("mousemove", function () {
var evt = window.event || arguments[0];
//if (evt.target.id !== sDivId) return;
var buttonType = evt.buttons || evt.button;
if (evt.buttons == undefined && buttonType == 0) {
_self.onSelect(evt, sDivId);
}
if (buttonType === 1) {
_self.onSelect(evt, sDivId);
}
if (buttonType === 2) {
var newX = intOriginalPosition[0] + evt.clientX - intMousePosition[0];
var newY = intOriginalPosition[1] + evt.clientY - intMousePosition[1];
if (newX >= 0) {
newX = 0;
}
if (newY >= 0) {
newY = 0;
}
$("#" + sDivId).css("left", newX + "px");
$("#" + sDivId).css("top", newY + "px");
$("#" + sDivId).css("width", (parentWidth-newX) + "px");
$("#" + sDivId).css("height", (parentHeight-newY) + "px");

}
clearEventBubble(evt);
}, document);

addEvent("mouseup", function () {
var evt = window.event || arguments[0];
var buttonType = evt.buttons || evt.button;
if (evt.buttons == undefined && buttonType == 0) {
}
if (buttonType === 1) {
}
document.getElementById(sDivId).style.cursor = "default";
_self.onEnd();
}, document);
}

RegionSelect.prototype.onBeforeSelect = function (evt, sDivId) {
// 创建模拟 选择框
var _self = this;
_self.InitRegions(_self.selProp);
if (!document.getElementById("selContainer")) {
this.selectDiv = document.createElement("div");
this.selectDiv.style.cssText = "position:absolute;width:0px;height:0px;font-size:0px;margin:0px;padding:0px;border:1px dashed #0099FF;background-color:#C3D5ED;z-index:1000;filter:alpha(opacity:60);opacity:0.6;display:none;";
this.selectDiv.id = "selContainer";
document.getElementById(sDivId).appendChild(this.selectDiv);
} else {
this.selectDiv = document.getElementById("selContainer");
}

this.startX = posXY(evt, sDivId).x;
this.startY = posXY(evt, sDivId).y;
this.isSelect = true;

}

RegionSelect.prototype.onSelect = function (evt, sDivId) {
var self = this;
if (self.isSelect) {
if (self.selectDiv.style.display == "none") self.selectDiv.style.display = "";

var posX = posXY(evt, sDivId).x;
var poxY = posXY(evt, sDivId).y;
self.selectDiv.style.left = Math.min(posX, this.startX) + "px";
self.selectDiv.style.top = Math.min(poxY, this.startY) + "px";
self.selectDiv.style.width = Math.abs(posX - this.startX) + "px";
self.selectDiv.style.height = Math.abs(poxY - this.startY) + "px";

var regionList = self.regions;
for (var i = 0; i < regionList.length; i++) {
if (self.selectDiv.parentNode.id !== regionList[i].parentNode.id) continue;
var r = regionList[i], sr = self.innerRegion(self.selectDiv, r);
if (sr && r.className.indexOf(self.selectedClass) == -1) {
r.className = r.className + " " + self.selectedClass;
_selectedRegions.push(r);
} else if (!sr && r.className.indexOf(self.selectedClass) != -1) {
r.className = r.className.replaceAll(self.selectedClass, "");
_selectedRegions.remove(r);
}

}
}
}

RegionSelect.prototype.onEnd = function () {
var self = this;
if (self.selectDiv) {
self.selectDiv.style.display = "none";
}
this.isSelect = false;
//_selectedRegions = this.selectedRegion;
}

// 判断一个区域是否在选择区内
RegionSelect.prototype.innerRegion = function (selDiv, region) {
var s_top = parseInt(selDiv.style.top);
var s_left = parseInt(selDiv.style.left);
var s_right = s_left + parseInt(selDiv.offsetWidth);
var s_bottom = s_top + parseInt(selDiv.offsetHeight);

var r_top = parseInt(region.offsetTop);
var r_left = parseInt(region.offsetLeft);
var r_right = r_left + parseInt(region.offsetWidth);
var r_bottom = r_top + parseInt(region.offsetHeight);

var t = Math.max(s_top, r_top);
var r = Math.min(s_right, r_right);
var b = Math.min(s_bottom, r_bottom);
var l = Math.max(s_left, r_left);

if (b > t + 5 && r > l + 5) {
return region;
} else {
return null;
}

}

RegionSelect.prototype.clearSelections = function (regions) {
for (var i = 0; i < regions.length; i++) {
regions[i].className = regions[i].className.replaceAll(this.selectedClass, "");
}
}

function getSelectedRegions() {
return _selectedRegions;
}

/*-------------------------------------- 区域选择方法结束 --------------------------------------------*/

function showSelDiv() {
var selInfo = "";
var arr = getSelectedRegions();
for (var i = 0; i < arr.length; i++) {
selInfo += arr[i].innerHTML + "
";
}

alert("共选择 " + arr.length + " 个文件，分别是：
" + selInfo);

}

function MoveSelectDiv(event, ui,id) {
var arr = getSelectedRegions();
var iMoveLeft = ui.position.left - ui.originalPosition.left;
var iMoveTop = ui.position.top - ui.originalPosition.top;

for (var i = 0; i < arr.length; i++) {
//if (arr[i].id === id) continue;

if (arr[i].parentNode.id !== document.getElementById(id).parentNode.id) continue;
var iLeft = parseInt($(arr[i]).attr("bLeft"));
var iTop = parseInt($(arr[i]).attr("bTop"));
$(arr[i]).css("left", (iLeft + iMoveLeft) + "px");
$(arr[i]).css("top", (iTop + iMoveTop) + "px");
}
}

function startMove() {
var arr = getSelectedRegions();
for (var i = 0; i < arr.length; i++) {
$(arr[i]).attr("bLeft", $(arr[i]).position().left);
$(arr[i]).attr("bTop", $(arr[i]).position().top);
}
}



三、对齐、旋转代码示例


//左对齐
function SelectAlignLeft() {
var arr = getSelectedRegions();
var iLeft = 0;
var id = "";

for (var i = 0; i < arr.length; i++) {
if (id === "") id = arr[i].parentNode.id;
if (id !== arr[i].parentNode.id) continue;
if ($(arr[i]).position().left<iLeft||iLeft===0) {
iLeft = $(arr[i]).position().left;
}
}

for (var j = 0; j < arr.length; j++) {
if (id !== arr[j].parentNode.id) continue;
$(arr[j]).css("left", iLeft + "px");
}

jsPlumb.repaintEverything();
}

//居中对齐
function SelectAlignCenter() {
var arr = getSelectedRegions();
var iLeft = 0;
var id = "";

for (var i = 0; i < arr.length; i++) {
if (id === "") id = arr[i].parentNode.id;
if (id !== arr[i].parentNode.id) continue;
if ($(arr[i]).position().left < iLeft || iLeft === 0) {
iLeft = $(arr[i]).position().left + parseInt(GetStyle(arr[i],"width")) / 2;
}
}

for (var j = 0; j < arr.length; j++) {
if (id !== arr[j].parentNode.id) continue;
$(arr[j]).css("left", (iLeft - parseInt(GetStyle(arr[j],"width")) / 2) + "px");
}

jsPlumb.repaintEverything();
}
//右对齐
function SelectAlignRight() {
var arr = getSelectedRegions();
var iLeft = 0;
var id = "";

for (var i = 0; i < arr.length; i++) {
if (id === "") id = arr[i].parentNode.id;
if (id !== arr[i].parentNode.id) continue;
if ($(arr[i]).position().left + parseInt(GetStyle(arr[i], "width")) > iLeft || iLeft === 0) {
iLeft = $(arr[i]).position().left + parseInt(GetStyle(arr[i], "width"));
}
}

for (var j = 0; j < arr.length; j++) {
if (id !== arr[j].parentNode.id) continue;
$(arr[j]).css("left", (iLeft - parseInt(GetStyle(arr[j], "width"))) + "px");
}

jsPlumb.repaintEverything();
}

//上对齐
function SelectAlignTop() {
var arr = getSelectedRegions();
var iTop = 0;
var id = "";

for (var i = 0; i < arr.length; i++) {
if (id === "") id = arr[i].parentNode.id;
if (id !== arr[i].parentNode.id) continue;
if ($(arr[i]).position().top < iTop || iTop === 0) {
iTop = $(arr[i]).position().top;
}
}

for (var j = 0; j < arr.length; j++) {
if (id !== arr[j].parentNode.id) continue;
$(arr[j]).css("top", iTop + "px");
}

jsPlumb.repaintEverything();
}

//垂直居中
function SelectAlignMiddle() {
var arr = getSelectedRegions();
var iTop = 0;
var id = "";

for (var i = 0; i < arr.length; i++) {
if (id === "") id = arr[i].parentNode.id;
if (id !== arr[i].parentNode.id) continue;
if ($(arr[i]).position().top + parseInt(GetStyle(arr[i], "height")) / 2 < iTop || iTop === 0) {
iTop = $(arr[i]).position().top + parseInt(GetStyle(arr[i], "height")) / 2;
}
}

for (var j = 0; j < arr.length; j++) {
if (id !== arr[j].parentNode.id) continue;
$(arr[j]).css("top", (iTop - parseInt(GetStyle(arr[j], "height")) / 2) + "px");
}

jsPlumb.repaintEverything();
}

//下对齐
function SelectAlignBottom() {
var arr = getSelectedRegions();
var iTop = 0;
var id = "";

for (var i = 0; i < arr.length; i++) {
if (id === "") id = arr[i].parentNode.id;
if (id !== arr[i].parentNode.id) continue;
if ($(arr[i]).position().top + parseInt(GetStyle(arr[i], "height")) > iTop || iTop === 0) {
iTop = $(arr[i]).position().top + parseInt(GetStyle(arr[i], "height"));
}
}

for (var j = 0; j < arr.length; j++) {
if (id !== arr[j].parentNode.id) continue;
$(arr[j]).css("top", (iTop - parseInt(GetStyle(arr[j], "height"))) + "px");
}

jsPlumb.repaintEverything();
}

//上下靠拢
function SelectUpColse() {
var arr = getSelectedRegions();
var iTop = 0;
var id = "";
for (var i = 0; i < arr.length; i++) {
if (id === "") id = arr[i].parentNode.id;
if (id !== arr[i].parentNode.id) continue;
if (iTop === 0) iTop = $(arr[i]).position().top;
$(arr[i]).css("top", iTop + "px");
iTop += parseInt(GetStyle(arr[i], "height"));
}

jsPlumb.repaintEverything();
}

//左右靠拢
function SelectLeftColse() {
var arr = getSelectedRegions();
var iLeft = 0;
var id = "";
for (var i = 0; i < arr.length; i++) {
if (id === "") id = arr[i].parentNode.id;
if (id !== arr[i].parentNode.id) continue;
if (iLeft === 0) iLeft = $(arr[i]).position().left;
$(arr[i]).css("left", iLeft + "px");
iLeft += parseInt(GetStyle(arr[i], "width"));
}

jsPlumb.repaintEverything();

}


//同高
function SelectSameHeight() {
var arr = getSelectedRegions();
var iHeigth = 0;
var id = "";
for (var i = 0; i < arr.length; i++) {
if (id === "") id = arr[i].parentNode.id;
if (id !== arr[i].parentNode.id) continue;
if (iHeigth === 0) iHeigth = parseInt(GetStyle(arr[i], "height"));
$(arr[i]).css("height", iHeigth+"px");
}

jsPlumb.repaintEverything();
}


//同宽
function SelectSameWidth() {
var arr = getSelectedRegions();
var iWidth = 0;
var id = "";
for (var i = 0; i < arr.length; i++) {
if (id === "") id = arr[i].parentNode.id;
if (id !== arr[i].parentNode.id) continue;
if (iWidth === 0) iWidth = parseInt(GetStyle(arr[i], "width"));
$(arr[i]).css("width", iWidth + "px");
}

jsPlumb.repaintEverything();

}


//旋转
function SelectClockwise(index) {
var arr = getSelectedRegions();
//var iWidth = 0;
//var id = "";
for (var i = 0; i < arr.length; i++) {
//if (id === "") id = arr[i].parentNode.id;
//if (id !== arr[i].parentNode.id) continue;
var sIndex= arr[i].style.transform.replace("rotate(", "").replace("deg)", "");
var iNum = 0;
if (sIndex) iNum = parseInt(sIndex);
$(arr[i]).css("transform", "rotate(" + (iNum + index)%360 + "deg)");

var points = jsPlumb.getEndpoints(arr[i]);
}

jsPlumb.repaintEverything();

}
//删除选中
function DeleteSelect() {
var arr = getSelectedRegions();
for (var i = 0; i < arr.length; i++) {
jsPlumb.remove(arr[i],true);
//var points = jsPlumb.getEndpoints(arr[i]);
//for (var j = 0; j < points.length; j++) {
// jsPlumb.deleteEndpoint(points[j]);
//}
//arr[i].parentNode.removeChild(arr[i]);
}

jsPlumb.repaintEverything();

}

function GetStyle(obj, attr) {
if (obj.currentStyle) {
return obj.currentStyle[attr]; //只适用于IE
}
else {
return getComputedStyle(obj, false)[attr]; //只适用于FF,Chrome,Safa
}
return obj.style[attr]; //本人测试在IE和FF下没有用,chrome有用
}



代码可能有点乱，待整理。上章有博友就找我要过源码，这次出来一个初级的版本，希望可以帮助大家更好的学习流程图的核心技术JsPlumb。


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