详解js中构造流程图的核心技术JsPlumb,js查错流程归纳

归纳是为了更好的理解。受jQuery
“Discussion”(

//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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3、引用文件或依赖模块或方法是否有效

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4、减少到最小测试用例(保持删除的东西,直到问题消失等)

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(2)初始化
使用JsPlumb需要注意一点,JsPlumb的连线的样式是由点确定的,也就是说点的样式里面包含了相关的属性来说明当使用此点来连线的时候,连线的样式应该是什么样的。
在我们项目里面,左边的模型区域,中间才是设计区域。那么要将一个元素从模型区域创建出来,就要用到我们JQuery
UI里面的draggable和droppable事件。首先我们注册左边模型的draggable和中间区域的droppable事件。

2、使用调试工具(例如:Firebug),看看是否有异常

一、设置连线的样式和颜色效果代码示例
大概的效果如图:

3、鼠标拖动区域选中元素,并且选中元素统一拖动位置。

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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。

这里很多效果其实在项目中作用并不太大,很多单纯就是为了展示用的。

5、问题描述尽量简洁,保持必要的细节

//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
}

项目里面用到了Web里面的拖拽流程图的技术JsPlumb,其实真不算难,不过项目里面用HTML做的一些类似flash的效果,感觉还不错,在此分享下。

1、确保您的页面元素标记是有效的

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:

15、选中元素逆时针旋转。

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:

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8、垂直居中对齐

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

重点来看看这一句:

 2、选中相关方法

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看看实现代码:
1、初始化的时候注册可选中

Js代码: 首先我们定义几个点的样式的全局变量

三、对齐、旋转代码示例

12、根据第一个选中的元素同高

首先来看看连线类型的那个select

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 <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>

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在页面初始化的时候注册select的change事件

13、根据第一个选中的元素同宽

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。

一、效果图展示

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1、概述
关于JsPlumb的内容,在此就简单说明下吧。jsPlumb是一个强大的JavaScript连线库,它可以将html中的元素用箭头、曲线、直线等连接起来,适用于开发Web上的图表、建模工具等。它同时支持jQuery+jQuery
UI、MooTools和YUI3这三个JavaScript框架,十分强大。本项目中还是结合大家最熟悉的JQuery来讲解。并且还要注意的一点就是JsPlumb的浏览器兼容性,JsPlumb支持IE
6以上、火狐、谷歌等各种浏览器

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);
  }
}

5、对选中元素居中对齐