Forms — widgets and support classes for capturing user information
The WFileUpload widget allows you to upload a local file to the server.
To properly use this widget you need to handle the uploaded() or fileTooLarge() signals; even when upload() was not called.
An oversized file will result in a fileTooLarge() signal. The default threshold value (128) for this signal is defined in the general application settings file wt_config.xml by the parameter max-request-size (Kb). See the Library overview for more details.
Also check using canUpload() if upload() will schedule a new upload.
Try dropping files in the widget below. It accepts a maximum of 5 files. You can drop one or multiple files at a time.
#include <Wt/WContainerWidget.h>
#include <Wt/WFileDropWidget.h>
auto dropWidgetPtr = Wt::cpp14::make_unique<Wt::WFileDropWidget>();
auto dropWidget = dropWidgetPtr.get();
dropWidget->drop().connect([=] (const std::vector<Wt::WFileDropWidget::File*>& files) {
const int maxFiles = 5;
unsigned prevNbFiles = dropWidget->uploads().size() - files.size();
for (unsigned i=0; i < files.size(); i++) {
if (prevNbFiles + i >= maxFiles) {
dropWidget->cancelUpload(files[i]);
continue;
}
Wt::WContainerWidget *block = dropWidget->addWidget(Wt::cpp14::make_unique<Wt::WContainerWidget>());
block->setToolTip(files[i]->clientFileName());
block->addStyleClass("upload-block spinner");
}
if (dropWidget->uploads().size() >= maxFiles)
dropWidget->setAcceptDrops(false);
});
dropWidget->uploaded().connect([=] (Wt::WFileDropWidget::File* file) {
std::vector<Wt::WFileDropWidget::File*> uploads = dropWidget->uploads();
std::size_t idx = 0;
for (; idx != uploads.size(); ++idx)
if (uploads[idx] == file)
break;
dropWidget->widget(idx)->removeStyleClass("spinner");
dropWidget->widget(idx)->addStyleClass("ready");
});
dropWidget->tooLarge().connect([=] (Wt::WFileDropWidget::File *file, uint64_t size) {
std::vector<Wt::WFileDropWidget::File*> uploads = dropWidget->uploads();
std::size_t idx = 0;
for (; idx != uploads.size(); ++idx)
if (uploads[idx] == file)
break;
dropWidget->widget(idx)->removeStyleClass("spinner");
dropWidget->widget(idx)->addStyleClass("failed");
});
dropWidget->uploadFailed().connect([=] (Wt::WFileDropWidget::File *file) {
std::vector<Wt::WFileDropWidget::File*> uploads = dropWidget->uploads();
std::size_t idx = 0;
for (; idx != uploads.size(); ++idx)
if (uploads[idx] == file)
break;
dropWidget->widget(idx)->removeStyleClass("spinner");
dropWidget->widget(idx)->addStyleClass("failed");
});