用户可以在工作簿选项上启用/禁用迭代计算。
当禁用迭代计算时，所有具有循环引用的单元格的值将为0，同时引用它们的其他单元格的值也将为0。
当启用迭代计算时，所有的循环引用将进行迭代计算，直到所有值的变化小于iterativeCalculationMaximumChange或迭代次数为iterativeCalculationMaximumIterations为止。
API如下:
iterativeCalculation：启用或禁用迭代计算
iterativeCalculationMaximumIterations：迭代计算时的最大迭代次数，默认为1000，取值范围为1〜32767
iterativeCalculationMaximumChange：迭代计算时的最大变化，默认为0.01，取值范围为0〜1.79769313486232e308
为 Events.UserFormulaEntered添加了isCircularReference属性，如果用户输入了循环引用，则为true。 例如：
您可以通过函数getCircularReference获取工作簿中的所有循环引用的单元格信息。 例如：
window.onload = function () {
var spread = new GC.Spread.Sheets.Workbook(_getElementById("ss"));
initSpread(spread);
};
function initSpread(spread) {
var sheet = spread.getActiveSheet();
spread.suspendPaint();
spread.suspendCalcService();
sheet.setColumnWidth(0, 120);
sheet.setColumnWidth(1, 100);
sheet.setColumnWidth(2, 120);
sheet.setColumnWidth(4, 120);
sheet.setColumnWidth(5, 130);
sheet.getCell(1, 1).foreColor("blue");
sheet.getCell(5, 1).foreColor("blue");
sheet.getCell(9, 1).foreColor("blue").formatter("0.0%");
sheet.getRange(1, 1, 7, 1).formatter("0.0");
sheet.setFormula(6, 5, '=F7+1');
sheet.setValue(0, 0, "Details");
sheet.setValue(1, 0, "Cash Revenue");
sheet.setValue(2, 0, "Interest Expense");
sheet.setValue(3, 0, "Cash Profit");
sheet.setValue(5, 0, "Beginning Debt");
sheet.setValue(6, 0, "Ending Debt");
sheet.setValue(7, 0, "Average Debt");
sheet.setValue(9, 0, "Interest");
sheet.setValue(0, 1, "Amount");
sheet.setValue(1, 1, 100);
sheet.setFormula(2, 1, '=B10*B8');
sheet.setFormula(3, 1, '=B2-B3');
sheet.setValue(5, 1, 150);
sheet.setFormula(6, 1, '=B6-B4');
sheet.setFormula(7, 1, '=AVERAGE(B6:B7)');
sheet.setValue(9, 1, 0.05);
sheet.setValue(0, 2, "Formula")
sheet.setFormula(2, 2, '=FORMULATEXT(B3)');
sheet.setFormula(3, 2, '=FORMULATEXT(B4)');
sheet.setFormula(6, 2, '=FORMULATEXT(B7)');
sheet.setFormula(7, 2, '=FORMULATEXT(B8)');
sheet.getRange(0, 0, 1, 3).backColor("#f2f2f2").foreColor("black");
sheet.getRange(6, 5, 1, 1).backColor("#009e00").foreColor("white");
sheet.getRange(1, 4, 1, 2).backColor("#f2f2f2").foreColor("black");
sheet.getRange(1, 0, 9, 3).setBorder(new GC.Spread.Sheets.LineBorder("#f2f2f2", GC.Spread.Sheets.LineStyle.thin), {all: true});
sheet.getRange(2, 4, 3, 2).setBorder(new GC.Spread.Sheets.LineBorder("#f2f2f2", GC.Spread.Sheets.LineStyle.thin), {all: true});
sheet.setValue(1, 4, "Use the Leibniz formula to approximate π")
sheet.setValue(2, 4, "n: 1→∞")
sheet.setValue(3, 4, {"richText":[{"text":"Pn: 4*(-1)"},{"style":{"vertAlign":1},"text":"n+1"},{"text":"/(2n-1)"}],"text":"Pn=4*(-1)n+1/(2n-1)"});
sheet.setValue(4, 4, "π: P1+P2+P3+...+Pn")
sheet.setFormula(4, 5, '=IFERROR(F4,0)+F5');
sheet.setFormula(3, 5, '=IF(F3<1,0,4/(2*F3-1)*POWER(-1,F3+1))');
sheet.setFormula(2, 5, '=F3+1'); // set the n in the last to make sure that added from n=1
spread.resumeCalcService();
spread.resumePaint();
bindEvent(spread);
}
function bindEvent (spread) {
_getElementById("IterativeCalculation").addEventListener('change', function () {
spread.options.iterativeCalculation = this.checked;
});
_getElementById("MaximumIterations").addEventListener('change', function () {
spread.options.iterativeCalculationMaximumIterations = this.value;
});
_getElementById("MaximumChange").addEventListener('change', function () {
spread.options.iterativeCalculationMaximumChange = this.value;
});
_getElementById("RecalcAll").addEventListener('click', function () {
spread.getActiveSheet().recalcAll(true);
});
}
function _getElementById(id) {
return document.getElementById(id);
}
<!doctype html>
<html style="height:100%;font-size:14px;">
<head>
<meta charset="utf-8" />
<meta name="spreadjs culture" content="zh-cn" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" type="text/css"
href="$DEMOROOT$/zh/purejs/node_modules/@grapecity-software/spread-sheets/styles/gc.spread.sheets.excel2013white.css">
<script src="$DEMOROOT$/zh/purejs/node_modules/@grapecity-software/spread-sheets/dist/gc.spread.sheets.all.min.js"
type="text/javascript"></script>
<script src="$DEMOROOT$/spread/source/js/license.js" type="text/javascript"></script>
<script
src="$DEMOROOT$/zh/purejs/node_modules/@grapecity-software/spread-sheets-resources-zh/dist/gc.spread.sheets.resources.zh.min.js"
type="text/javascript"></script>
<script src="app.js" type="text/javascript"></script>
<link rel="stylesheet" type="text/css" href="styles.css">
</head>
<body>
<div class="sample-tutorial">
<div id="ss" class="sample-spreadsheets"></div>
<div class="options-container">
<label>Change the <b>Maximum Iterations</b> and <b>Maximum Change</b> options below then press
<b>Recalculate</b> to see how this affects the calculations in cell F7.</label>
<div class="option-row">
<input style="width: 20px;float: left;" type="checkbox" id="IterativeCalculation" checked="checked" />
<label for="IterativeCalculation">Iterative Calculation</label>
</div>
<div class="option-row">
<label for="MaximumIterations">Maximum Iterations:</label>
<input type="number" id="MaximumIterations" value="1000">
</div>
<div class="option-row">
<label for="MaximumChange">Maximum Change:</label>
<input type="number" id="MaximumChange" value="0.01">
</div>
<div class="option-row">
<button id="RecalcAll">Recalculate</button>
</div>
</div>
</div>
</body>
</html>
.sample-tutorial {
position: relative;
height: 100%;
overflow: hidden;
}
.sample-spreadsheets {
width: calc(100% - 280px);
height: 100%;
overflow: hidden;
float: left;
}
.options-container {
float: right;
width: 280px;
padding: 12px;
height: 100%;
box-sizing: border-box;
background: #fbfbfb;
overflow: auto;
}
.option-row {
font-size: 14px;
padding: 5px;
margin-top: 10px;
}
input {
margin-bottom: 5px;
padding: 2px 4px;
width: 100%;
box-sizing: border-box;
}
body {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
