最近有业务需求，在使用水晶报表时导出格式要求限制为PDF，但是水晶报表的reportviewer没有提供这样的选项，没有办法只好使用hack的水晶报表的到处对话框的方式来实现。
具体实现为找到 “\aspnet_client\system_web\2_0_50727\CrystalReportWebFormViewer4\html\crystalexportdialog.htm” 文件，修改为以下代码：
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
</head>
<body>
<script language="javascript">
<!--
// export UI functions
function check(obj) {
return !obj.disabled;
}
function toggleRangeFields(obj) {
if( obj.id == "radio1") {
document.Export.from.disabled = true;
document.Export.to.disabled = true;
}
else {
document.Export.from.disabled = false;
document.Export.to.disabled = false;
}
return check(obj);
}
function checkDisableRange() {
if( document.Export.exportformat.value == "CrystalReports"
|| document.Export.exportformat.value == "RecordToMSExcel" ) {
if( document.Export.isRange[1].checked ) {
document.Export.isRange[0].checked = true;
}
document.Export.isRange[1].disabled = true;
document.Export.from.disabled = true;
document.Export.to.disabled = true;
}
else {
document.Export.isRange[1].disabled = false;
}
}
function isValidNumber(number) {
var nonDigit = /\D+/;
if( nonDigit.test(number) || number == '0' || number == "") {
return false;
}
return true;
}
function checkValuesAndSubmit() {
if( document.Export.isRange[1].checked ) {
if (!isValidNumber(document.Export.from.value) || !isValidNumber(document.Export.to.value) || (parseInt(document.Export.from.value, 10) >
parseInt(document.Export.to.value, 10))) {
alert(parent.parent.opener.L_InvalidPageRange);
return;
}
}
if( document.Export.exportformat != null && document.Export.exportformat.selectedIndex == 0 ) {
alert(parent.parent.opener.L_ExportFormat);
return;
}
document.Export.action = opener.document.getElementById('crystal_handler_page').value;
document.Export.submit();
}
function init() {
document.getElementById ('radio1').focus ();
if (document.getElementById('reportsource')) {
document.getElementById('reportsource').value = parent.opener.document.getElementById('crystal_print_rptsrc').value;
}
if (document.getElementById('viewstate')) {
document.getElementById('viewstate').value = parent.opener.document.getElementById('crystal_print_vs').value;
}
}
document.write(parent.parent.opener.getExportDialog());
var formatselect=document.getElementById('exportFormatList');
formatselect.options.length = 0;
formatselect.options[0]=new Option("格式","");
formatselect.options[1]=new Option("Acrobat 格式 (PDF)","PDF");
-->
</script>
</body>
</html>
重点就是
var formatselect=document.getElementById('exportFormatList');
formatselect.options.length = 0;
formatselect.options[0]=new Option("格式","");
formatselect.options[1]=new Option("Acrobat 格式 (PDF)","PDF");