Home >Web Front-end >JS Tutorial >List drag sorting implementation code based on JQuery_jquery
Requirements
Drag sorting, as you can imagine from the name, is to press and hold a row of data and drag it to the desired sorting position, and save the new sorting queue.
Thoughts
First create an anchor point for the list row, bind the mousedown and mouseup events, when the mouse moves to the position you want to insert, move the object row to the target row, and then sort all the rows it passes.
The idea is very simple, but there are still several issues to pay attention to
1. The position to which you move can be regarded as the position to be inserted into the target row.
2. When moving out of the top and bottom, it is judged as the first and last.
3. Processing of moving up and moving down
Solution
About the event
The mouse press and release events in Javascript are onmousedown and onmouseup. In JQuery, they are mousedown and mouseup. Therefore, mousedown and mouseup are used here
First of all, you need to know how many lines there are in the interface and how high each line is, because you need to judge the movement distance of the mouse
All you need to do is get lineNum (the number of lines). In addition to calculating the line height, another purpose is to use index() to move the line to the target position through the sequence index value
When the mousedown event is triggered, it is necessary to start calculating the distance of the mouse movement, which is used to determine where the line should be moved
dgid is mainly used to distinguish the identifier of each line. The general list is output by the program loop. Without such an ID, it is impossible to tell which line is which. Therefore, in HTML, You need to define a person to store the ID. The program uses attr to get this value, ensuring that each row has its own unique value.
thisLineTop is mainly used to calculate the height based on the mouse movement position, and then determine which line it has moved to based on the line height and index value. Another function is to determine whether the moving anchor point is pressed. If there is a value, it means yes, and the subsequent mouseup is established. If there is no value, it means the anchor point is not pressed, and mouseup does not perform any operation. Why do this? Because no matter where you click the mouse on the page, the mouseup event will be triggered. If there is no judgment, it will continue to execute, which will cause some problems.
topDistance and downDistance are used to determine whether the mouse has moved out of the list. If it has been removed, that is, the distance the mouse moves is greater than topDistance or downDistance, it can be judged that it needs to be moved to the first or last row.
The mousedown event mainly does these few things. Of course, for the sake of effect, you can also add some things
The purpose of these is just to make the operation more effective. For example, highlighting a row is to let the user know which row they are operating on. The prompt layer works the same way.
Regarding disabling selection, .disableSelection(); this is a method included in jQuery_UI. If you are using jQuery_UI, you can use it directly. If not, you can do this
var moveDistance=e.pageY-thisLineTop;
Do different processing according to different directions
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var dgid='',thisIndex,thisLineTop=0,topDistance,downDistance;
var tbodyHeight=setting.frame.outerHeight();
var lineNum=$("."+setting.dgLine).length;
var lineHeight=Math.ceil(tbodyHeight/lineNum);
$("."+setting.dgButton).mousedown(function(e){
dgid=$(this).attr(setting.id);
thisIndex=$("#"+setting.linePre+dgid).index();
var left=e.pageX+20;
var top=e.pageY;
thisLineTop=$("#"+setting.linePre+dgid).offset().top;
topDistance=thisIndex*lineHeight;
downDistance=(lineNum-thisIndex-1)*lineHeight;
$("#"+setting.linePre+dgid).css('background',setting.lineHighlight);
dg_tips(left,top);
$('body').css('cursor','move');
unselect();
setting.frame.mousemove(function(e){
$("#dgf").css({"left":e.pageX+setting.tipsOffsetLeft+'px',"top":e.pageY+'px'});
});
});
$('body').mouseup(function(e){
if(thisLineTop>0){
var moveDistance=e.pageY-thisLineTop;
if(moveDistance<0){
if(thisIndex!=0){
moveDistance=Math.abs(moveDistance);
if(moveDistance>lineHeight/2){
if(moveDistance>topDistance){
focusIndex=0;
}else{
focusIndex=thisIndex-Math.ceil(moveDistance/lineHeight);
}
$("."+setting.dgLine).eq(focusIndex).before($("#"+setting.linePre+dgid));
dg_update(thisIndex,focusIndex);
}
}
}else{
if(thisIndex!=lineNum-1){
if(moveDistance>lineHeight/2+lineHeight){
if(moveDistance>downDistance){
focusIndex=lineNum-1;
}else{
focusIndex=thisIndex+Math.ceil(moveDistance/lineHeight)-1;
}
$("."+setting.dgLine).eq(focusIndex).after($("#"+setting.linePre+dgid));
dg_update(thisIndex,focusIndex);
}
}
}
$("#dgf").remove();
$("#"+setting.linePre+dgid).css('background','');
dgid='';
thisLineTop=0;
$('body').css('cursor','default');
onselect();
}
});
function dg_update(thisIndex,focusIndex){
dg_mask();
var start=thisIndex
for(var i=start;i<=end;i++){
ids+=i==start?$("."+setting.dgLine).eq(i).attr(setting.id):','+$("."+setting.dgLine).eq(i).attr(setting.id);
vals+=i==start?i:','+i;
}
$.getJSON(setting.JSONUrl,{'do':'changeorders','ids':ids,'vals':vals},function(d){
$("#dg_mask").remove();
});
}
function dg_mask(){
var W=setting.frame.outerWidth();
var H=setting.frame.outerHeight();
var top=setting.frame.offset().top;
var left=setting.frame.offset().left;
var mask="
$('body').append(mask);
$("#dg_mask").css({"background":"#999","position":'absolute','width':W 'px','height':H 'px','line-height':H 'px','top':top 'px','left':left 'px','filter':'alpha(opacity=' setting.maskOpacity ')','moz-opacity':setting.maskOpacity/100,'opacity':setting.maskOpacity/100,'text-align':'center','color':'#000'});
}
function dg_tips(left,top){
var floatdiv="
$('body').append(floatdiv);
}
function unselect(){
$('body').each(function() {
$(this).attr('unselectable', 'on').css({
'-moz-user-select':'none',
'-webkit-user-select':'none',
'user-select':'none'
}).each(function() {
this.onselectstart = function() { return false; };
});
});
}
function onselect(){
$('body').each(function() {
$(this).attr('unselectable', '').css({
'-moz-user-select':'',
'-webkit-user-select':'',
'user-select':''
});
});
}
}
})(jQuery);
使用
拖动 | 名称 |
这里是一行 |
参数主要是dgLine,dgButton,id,linePre和JSONUrl,通过看HTML代码,应该不难理解。
关于拖动排序就是这么多了,当然还可以把效果做得更漂亮些,提示更清楚点,有助于用户体验