据我所知,jQuery UI 滑块小部件无法禁用单个句柄。但是,如果您不介意扩展 jQuery UI 滑块小部件,则可以添加此功能。
在下面的代码中,我扩展了_mouseCapture
jQuery UI 滑块小部件中的功能,以防止鼠标移动/选择具有ui-slider-handle-disabled
该类的句柄。它有点大,因为我必须复制现有_mouseCapture
函数并添加几行。我用评论标记了我的插入。
您可以在 jsfiddle 上测试此代码。
// extend jQuery UI slider widget's _mouseCapture function to allow disabling handles
// _mouseCapture function copied from jQuery UI v1.10.3
$.widget("ui.slider", $.ui.slider, {
_mouseCapture: function (event) {
var position, normValue, distance, closestHandle, index, allowed, offset, mouseOverHandle,
that = this,
o = this.options;
if (o.disabled) {
return false;
}
this.elementSize = {
width: this.element.outerWidth(),
height: this.element.outerHeight()
};
this.elementOffset = this.element.offset();
position = {
x: event.pageX,
y: event.pageY
};
normValue = this._normValueFromMouse(position);
distance = this._valueMax() - this._valueMin() + 1;
this.handles.each(function (i) {
// Added condition to skip closestHandle test if this handle is disabled.
// This prevents disabled handles from being moved or selected with the mouse.
if (!$(this).hasClass("ui-slider-handle-disabled")) {
var thisDistance = Math.abs(normValue - that.values(i));
if ((distance > thisDistance) || (distance === thisDistance && (i === that._lastChangedValue || that.values(i) === o.min))) {
distance = thisDistance;
closestHandle = $(this);
index = i;
}
}
});
// Added check to exit gracefully if, for some reason, all handles are disabled
if(typeof closestHandle === 'undefined')
return false;
allowed = this._start(event, index);
if (allowed === false) {
return false;
}
this._mouseSliding = true;
this._handleIndex = index;
closestHandle.addClass("ui-state-active")
.focus();
offset = closestHandle.offset();
// Added extra condition to check if the handle currently under the mouse cursor is disabled.
// This ensures that if a disabled handle is clicked, the nearest handle will remain under the mouse cursor while dragged.
mouseOverHandle = !$(event.target).parents().addBack().is(".ui-slider-handle") || $(event.target).parents().addBack().is(".ui-slider-handle-disabled");
this._clickOffset = mouseOverHandle ? {
left: 0,
top: 0
} : {
left: event.pageX - offset.left - (closestHandle.width() / 2),
top: event.pageY - offset.top - (closestHandle.height() / 2) - (parseInt(closestHandle.css("borderTopWidth"), 10) || 0) - (parseInt(closestHandle.css("borderBottomWidth"), 10) || 0) + (parseInt(closestHandle.css("marginTop"), 10) || 0)
};
if (!this.handles.hasClass("ui-state-hover")) {
this._slide(event, index, normValue);
}
this._animateOff = true;
return true;
}
});