详解js中构造流程图的核心技术JsPlumb（2）_javascript技巧

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

 

  连线类型：
　　

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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;
    }
  });
});

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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();
});

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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 + "\n";
  }

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

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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 + 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
}

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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。