defaultValue API用于为单元格设置默认值或默认公式，这样当单元格为空时，它将显示默认值或从默认公式计算得到的值。
当一个空单元格应用了默认值或默认公式，并且用户编辑该单元格时，不会覆盖默认值。
以下是相关的API：
window.onload = function () {
let spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"), {sheetCount: 1});
spread.suspendPaint();
let sheet = spread.getActiveSheet();
let fbx = new GC.Spread.Sheets.FormulaTextBox.FormulaTextBox(document.getElementById('formula'), {rangeSelectMode: true});
fbx.workbook(spread);
initSpread(spread, fbx);
bindEvents(spread);
spread.resumePaint();
};
function bindEvents(spread) {
spread.bind(GC.Spread.Sheets.Events.SelectionChanged, function () {
getDefault(spread.getActiveSheet());
});
spread.bind(GC.Spread.Sheets.Events.ActiveSheetChanged, function () {
self.getDefault(spread.getActiveSheet());
});
}
function getDefault(sheet) {
let selections = sheet.getSelections(), showDefault = document.getElementById('showDefault');
if (!selections || selections.length === 0) {
showDefault.value = '';
return;
}
let sel = selections[0], row = sel.row, col = sel.col;
if (sel.rowCount === 1 && sel.colCount === 1) {
showDefault.value = sheet.getDefaultValue(row, col);
} else {
showDefault.value = '';
}
}
function convertValue (value) {
if (!value) {
return value;
}
// try to convert to number
let num = Number(value);
if (!isNaN(num)) {
return num;
}
// try to convert to boolean
if (value.toLowerCase() === "true" || value.toLowerCase() === "false") {
return value.toLowerCase() === "true";
}
// try to convert to date
let date = new Date(value);
if (!isNaN(date.getTime())) {
return date;
}
return value;
}
function initSpread(spread, fbx) {
fetch(getFileUrl()).then(res => res.blob()).then(file => {
spread.open(file, () => {
let sheet = spread.getActiveSheet();
sheet.suspendPaint();
sheet.suspendCalcService();
for (let i = 0; i < 12; i++) {
sheet.getCell(2, 3 + i, 3).defaultValue('=$B3/12');
sheet.getCell(3, 3 + i, 3).defaultValue('=$B4/12');
}
sheet.resumeCalcService();
sheet.resumePaint();
getDefault(spread.getActiveSheet());
});
});
document.getElementById('btnSetDefault').onclick = function () {
let value = document.getElementById('value').value;
let formula = fbx.text();
sheet = spread.getActiveSheet();
let selections = sheet.getSelections();
if (!selections || selections.length === 0) {
return;
}
sheet.suspendPaint();
let length = selections.length;
for (let i = 0; i < length; i++) {
let sel = selections[i],
rowIndex = sel.row,
colIndex = sel.col,
rowCount = sel.rowCount,
colCount = sel.colCount,
maxRow = rowIndex + rowCount,
maxColumn = colIndex + colCount,
r, c;
if (rowIndex !== -1 && colIndex !== -1) {
for (r = rowIndex; r < maxRow; r++) {
for (c = colIndex; c < maxColumn; c++) {
sheet.setDefaultValue(r, c, formula || convertValue(value));
}
}
}
}
sheet.resumePaint();
getDefault(sheet);
};
}
function getFileUrl () {
return '$DEMOROOT$/spread/source/data/defaultValue.sjs';
}
<!doctype html>
<html style="height:100%;font-size:14px;">
<head>
<meta name="spreadjs culture" content="zh-cn" />
<meta charset="utf-8" />
<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="$DEMOROOT$/zh/purejs/node_modules/@grapecity-software/spread-sheets-resources-zh/dist/gc.spread.sheets.resources.zh.min.js"
type="text/javascript"></script>
<script src="$DEMOROOT$/zh/purejs/node_modules/@grapecity-software/spread-sheets-io/dist/gc.spread.sheets.io.min.js" type="text/javascript"></script>
<script src="$DEMOROOT$/spread/source/js/license.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">
<div class="option-row">
<p>
<span>You can set, get the default value and formula for the active cells.</span>
</p>
</div>
<div class="option-row">
<label for="value">Default Value: </label>
<input id="value" />
</div>
<div class="option-row">
<label for="formula">Default Formula: </label>
<div id="formula" spellcheck="false"
style="border: 1px solid #808080;width:100%;height:21px;overflow:hidden;"></div>
</div>
<div class="option-row">
<input type="button" id="btnSetDefault" value="Set Default"
title="Set default value and formula to selected item(s)" />
</div>
<div class="option-row">
<label for="showDefault">Get Default Value: </label>
<textarea id="showDefault" cols="31" readonly></textarea>
</div>
</div>
</div>
</body>
</html>
.sample {
position: relative;
height: 100%;
overflow: auto;
}
.sample::after {
display: block;
content: "";
clear: both;
}
.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;
}
label {
display: inline-block;
margin-bottom: 6px;
}
input {
padding: 4px;
width: 100%;
margin: 0 4px 4px 0;
box-sizing: border-box;
}
input[type=button] {
width: 30%;
}
p {
background-color: #F4F8EB;
padding: 4px;
}
p span {
display: block;
}
body {
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
