我有一个Bootstrap Modal，使用jQuery在其中添加了Select下拉菜单，然后我需要获取该下拉菜单的值并显示或隐藏其他文本输入。
模态//points list
List<MatOfPoint> squares = new ArrayList<MatOfPoint>();
private void findSquares(Mat image, List<MatOfPoint> squares){
squares.clear();
Mat smallerImg=new Mat(new Size(image.width()/2, image.height()/2),image.type());
Mat gray = new Mat(image.size(),image.type());
Mat gray0=new Mat(image.size(),CvType.CV_8U);
// down-scale and upscale the image to filter out the noise
Imgproc.pyrDown(image,smallerImg,smallerImg.size());
Imgproc.pyrUp(smallerImg, image,image.size());
// find squares in every color plane of the image
for( int c = 0; c < 3; c++ ){
extractChannel(image, gray, c);
// try several threshold levels
for( int l = 1; l < N; l++ ){
//bez canny
Imgproc.threshold(gray, gray0, (l+1)*255/N, 255, Imgproc.THRESH_BINARY);
List<MatOfPoint> contours=new ArrayList<MatOfPoint>();
// find contours and store them all as a list
Imgproc.findContours(gray0, contours, new Mat(), Imgproc.RETR_LIST, Imgproc.CHAIN_APPROX_SIMPLE);
MatOfPoint approx=new MatOfPoint();
// test each contour
for( int i = 0; i < contours.size(); i++ ){
// approximate contour with accuracy proportional
// to the contour perimeter
approx = approxPolyDP( contours.get(i), Imgproc.arcLength(new MatOfPoint2f(contours.get(i).toArray()), true)*0.02, true);
double area = Imgproc.contourArea(approx);
if(area > 5000){
if (approx.toArray().length == 4 &&
Math.abs(Imgproc.contourArea(approx)) > 1000 &&
Imgproc.isContourConvex(approx)) {
double maxCosine = 0;
Rect bitmap_rect = null;
for (int j = 2; j < 5; j++) {
// find the maximum cosine of the angle between joint edges
double cosine = Math.abs(angle(approx.toArray()[j % 4], approx.toArray()[j - 2], approx.toArray()[j - 1]));
maxCosine = Math.max(maxCosine, cosine);
bitmap_rect = new Rect(approx.toArray()[j % 4], approx.toArray()[j - 2]);
}
// if cosines of all angles are small
// (all angles are ~90 degree) then write quandrange
// vertices to resultant sequence
if( maxCosine < 0.3 )
squares.add(approx);
}
}
}
}
}
}
的一部分：
#testDetailModaljQuery添加Select：
<div class="modal-body" id="modalBody">
<p id="modalName"></p>
<p id="modalTime"></p>
<div class="col-md-12">
</div>
<p id="modalResponse"></p>
<div class="col-md-12">
<button type="button" class="btn btn-danger mt-2" id="statusButton">Change</button>
</div>
</div>
如果选择了“失败”选项，我想显示$('<div class="soldClass col-md-12"><div class="form-group">
<label for="test-result" class="control-label">Update result:</label>
<select class="form-control" name="test-result" id=resultSelect">
<option value="">Choose</option>
<option value="pass">Passed</option>
<option value="fail">Failed</option>
</select></div></div>
<div id="datePick" class="dateClass col-md-12"><div class="form-group">
<label for="test-date" class="control-label">Next test:</label>
<input type="date" class="form-control" name="test-date"></div></div>
<div class="resultClass col-md-12">
<button type="button" class="btn btn-danger mt-2" id="resultButton">Update</button>
</div>').insertAfter( "#modalTime" );
div，我将其隐藏为：
#datePick我无法获得Select的值来显示它，这是我尝试过的：
$('#testDetailModal').on('shown.bs.modal', function () {
var nextDate = $('#datePick');
nextDate.hide();
});
希望有人可以为我指明正确的方向，我认为这与使用$('#testDetailModal').on('change','#resultSelect', function () {
var resultOption = $('#resultSelect option:selected').val();
if(resultOption == 'fail') {
nextDate.show();
//console.log(this.value);
} else {
nextDate.hide();
}
});
有关，但不确定如何去做。