我做了一些非常相似昨天那麼爲什麼不分享:)
我的目標是下降的文本元素在我的文字區域,在兩行文本中間但卻向哪裏會被丟棄的指標。我相信它對你有用! ;)
$(document).ready(function() {
var lineHeight = parseInt($('#textarea').css('line-height').replace('px',''));
var previousLineNo = 0;
var content = $('#textarea').val();
var linesArray = content.length > 0 ? content.split('\n') : [];
var lineNo = 0;
var emptyLineAdded = false;
$('.draggable').draggable({
revert: function(is_valid_drop) {
if (!is_valid_drop) {
$('#textarea').val(content);
return true;
}
},
drag: function(event, ui) {
lineNo = getLineNo(ui, lineHeight);
if (linesArray.length > 0 && previousLineNo != lineNo) {
insertWhiteLine(lineNo, linesArray);
}
previousLineNo = lineNo;
}
});
$("#textarea").droppable({
accept: ".draggable",
drop: function(event, ui) {
appendAtLine(lineNo, linesArray, ui.draggable.text());
$(ui.draggable).remove();
content = $('#textarea').val();
linesArray = content.split('\n');
if (linesArray[linesArray.length - 1] == '')
linesArray.pop(); //remove empty line
}
});
$('#textarea').on('input', function() {
if (!emptyLineAdded) {
console.log('input !');
console.log($('#textarea').val());
content = $('#textarea').val();
linesArray = content.split('\n');
if (linesArray[linesArray.length - 1] == '')
linesArray.pop(); //remove empty line
}
});
});
//Returns the top position of a draggable element,
//relative to the textarea. (0 means at the very top of the textarea)
function getYPosition(element, lineHeight) {
var participantIndex = $(element.helper.context).index();
var initPos = participantIndex * lineHeight;
var actualPos = initPos + element.position.top;
return actualPos;
}
//Returns the line number corresponding to where the element
//would be dropped
function getLineNo(element, lineHeight) {
return Math.round(getYPosition(element, lineHeight)/lineHeight);
}
//Inserts a white line at the given line number,
//to show where the element would be dropped in the textarea
function insertWhiteLine(lineNo, linesArray) {
$('#textarea').val('');
$(linesArray).each(function(index, value) {
if (index < lineNo)
$('#textarea').val($('#textarea').val() + value + '\n');
});
emptyLineAdded = true;
$('#textarea').val($('#textarea').val() + '_____________\n'); //white line
emptyLineAdded = false;
$(linesArray).each(function(index, value) {
if (index >= lineNo)
$('#textarea').val($('#textarea').val() + value + '\n');
});
}
//Inserts content of draggable at the given line number
function appendAtLine(lineNo, linesArray, content) {
$('#textarea').val('');
$(linesArray).each(function(index, value) {
if (index < lineNo)
$('#textarea').val($('#textarea').val() + value + '\n');
});
$('#textarea').val($('#textarea').val() + content + '\n'); //content to be added
$(linesArray).each(function(index, value) {
if (index >= lineNo)
$('#textarea').val($('#textarea').val() + value + '\n');
});
}
這是非常複雜的。從一個複雜的框架開始:http://www.sencha.com/products/extjs/examples/另外,IE7的使用率低於1%,但最終可能會增加20%的成本。 –
@Diodeus。我擔心它會非常複雜。如果它支持IE9 +會不會更復雜?我可以輕鬆地爲舊版瀏覽器創建功能更強的用戶友好版本。 – user1032531