[Error] 'else' without a previous 'if'是什么意思

时间: 2024-01-22 19:01:43 浏览: 272

Sortable前端框架

# Sortable Sortable is a <s>minimalist</s> JavaScript library for reorderable drag-and-drop lists. Demo: http://rubaxa.github.io/Sortable/ ## Features * Supports touch devices and [modern](http://caniuse.com/#search=drag) browsers (including IE9) * Can drag from one list to another or within the same list * CSS animation when moving items * Supports drag handles *and selectable text* (better than voidberg's html5sortable) * Smart auto-scrolling * Built using native HTML5 drag and drop API * Supports * [Meteor](https://github.com/SortableJS/meteor-sortablejs) * AngularJS * [2.0+](https://github.com/SortableJS/angular-sortablejs) * [1.*](https://github.com/SortableJS/angular-legacy-sortablejs) * React * [ES2015+](https://github.com/SortableJS/react-sortablejs) * [Mixin](https://github.com/SortableJS/react-mixin-sortablejs) * [Knockout](https://github.com/SortableJS/knockout-sortablejs) * [Polymer](https://github.com/SortableJS/polymer-sortablejs) * [Vue](https://github.com/SortableJS/Vue.Draggable) * Supports any CSS library, e.g. [Bootstrap](#bs) * Simple API * [CDN](#cdn) * No jQuery (but there is [support](#jq)) ### Articles * [Sortable v1.0 — New capabilities](https://github.com/RubaXa/Sortable/wiki/Sortable-v1.0-—-New-capabilities/) (December 22, 2014) * [Sorting with the help of HTML5 Drag'n'Drop API](https://github.com/RubaXa/Sortable/wiki/Sorting-with-the-help-of-HTML5-Drag'n'Drop-API/) (December 23, 2013) ### Install Via npm ```bash $ npm install sortablejs --save ``` Via bower: ```bash $ bower install --save sortablejs ``` ### Usage ```html <ul id="items"> <li>item 1</li> <li>item 2</li> <li>item 3</li> </ul> ``` ```js var el = document.getElementById('items'); var sortable = Sortable.create(el); ``` You can use any element for the list and its elements, not just `ul`/`li`. Here is an [example with `div`s](http://jsbin.com/qumuwe/edit?html,js,output). --- ### Options ```js var sortable = new Sortable(el, { group: "name", // or { name: "...", pull: [true, false, clone], put: [true, false, array] } sort: true, // sorting inside list delay: 0, // time in milliseconds to define when the sorting should start touchStartThreshold: 0, // px, how many pixels the point should move before cancelling a delayed drag event disabled: false, // Disables the sortable if set to true. store: null, // @see Store animation: 150, // ms, animation speed moving items when sorting, `0` — without animation handle: ".my-handle", // Drag handle selector within list items filter: ".ignore-elements", // Selectors that do not lead to dragging (String or Function) preventOnFilter: true, // Call `event.preventDefault()` when triggered `filter` draggable: ".item", // Specifies which items inside the element should be draggable ghostClass: "sortable-ghost", // Class name for the drop placeholder chosenClass: "sortable-chosen", // Class name for the chosen item dragClass: "sortable-drag", // Class name for the dragging item dataIdAttr: 'data-id', forceFallback: false, // ignore the HTML5 DnD behaviour and force the fallback to kick in fallbackClass: "sortable-fallback", // Class name for the cloned DOM Element when using forceFallback fallbackOnBody: false, // Appends the cloned DOM Element into the Document's Body fallbackTolerance: 0, // Specify in pixels how far the mouse should move before it's considered as a drag. scroll: true, // or HTMLElement scrollFn: function(offsetX, offsetY, originalEvent, touchEvt, hoverTargetEl) { ... }, // if you have custom scrollbar scrollFn may be used for autoscrolling scrollSensitivity: 30, // px, how near the mouse must be to an edge to start scrolling. scrollSpeed: 10, // px setData: function (/** DataTransfer */dataTransfer, /** HTMLElement*/dragEl) { dataTransfer.setData('Text', dragEl.textContent); // `dataTransfer` object of HTML5 DragEvent }, // Element is chosen onChoose: function (/**Event*/evt) { evt.oldIndex; // element index within parent }, // Element dragging started onStart: function (/**Event*/evt) { evt.oldIndex; // element index within parent }, // Element dragging ended onEnd: function (/**Event*/evt) { var itemEl = evt.item; // dragged HTMLElement evt.to; // target list evt.from; // previous list evt.oldIndex; // element's old index within old parent evt.newIndex; // element's new index within new parent }, // Element is dropped into the list from another list onAdd: function (/**Event*/evt) { // same properties as onEnd }, // Changed sorting within list onUpdate: function (/**Event*/evt) { // same properties as onEnd }, // Called by any change to the list (add / update / remove) onSort: function (/**Event*/evt) { // same properties as onEnd }, // Element is removed from the list into another list onRemove: function (/**Event*/evt) { // same properties as onEnd }, // Attempt to drag a filtered element onFilter: function (/**Event*/evt) { var itemEl = evt.item; // HTMLElement receiving the `mousedown|tapstart` event. }, // Event when you move an item in the list or between lists onMove: function (/**Event*/evt, /**Event*/originalEvent) { // Example: http://jsbin.com/tuyafe/1/edit?js,output evt.dragged; // dragged HTMLElement evt.draggedRect; // TextRectangle {left, top, right и bottom} evt.related; // HTMLElement on which have guided evt.relatedRect; // TextRectangle originalEvent.clientY; // mouse position // return false; — for cancel }, // Called when creating a clone of element onClone: function (/**Event*/evt) { var origEl = evt.item; var cloneEl = evt.clone; } }); ``` --- #### `group` option To drag elements from one list into another, both lists must have the same `group` value. You can also define whether lists can give away, give and keep a copy (`clone`), and receive elements. * name: `String` — group name * pull: `true|false|'clone'|function` — ability to move from the list. `clone` — copy the item, rather than move. * put: `true|false|["foo", "bar"]|function` — whether elements can be added from other lists, or an array of group names from which elements can be taken. * revertClone: `boolean` — revert cloned element to initial position after moving to a another list. Demo: - http://jsbin.com/naduvo/edit?js,output - http://jsbin.com/rusuvot/edit?js,output — use of complex logic in the `pull` and` put` - http://jsbin.com/magogub/edit?js,output — use `revertClone: true` --- #### `sort` option Sorting inside list. Demo: http://jsbin.com/videzob/edit?html,js,output --- #### `delay` option Time in milliseconds to define when the sorting should start. Demo: http://jsbin.com/xizeh/edit?html,js,output --- #### `touchStartThreshold` option This option is similar to `fallbackTolerance` option. When the `delay` option is set, some phones with very sensitive touch displays like the Samsung Galaxy S8 will fire unwanted touchmove events even when your finger is not moving, resulting in the sort not triggering. This option sets the minimum pointer movement that must occur before the delayed sorting is cancelled. Values between 3 to 5 are good. --- #### `disabled` options Disables the sortable if set to `true`. Demo: http://jsbin.com/xiloqu/edit?html,js,output ```js var sortable = Sortable.create(list); document.getElementById("switcher").onclick = function () { var state = sortable.option("disabled"); // get sortable.option("disabled", !state); // set }; ``` --- #### `handle` option To make list items draggable, Sortable disables text selection by the user. That's not always desirable. To allow text selection, define a drag handler, which is an area of every list element that allows it to be dragged around. Demo: http://jsbin.com/newize/edit?html,js,output ```js Sortable.create(el, { handle: ".my-handle" }); ``` ```html <ul> <li>:: list item text one <li>:: list item text two </ul> ``` ```css .my-handle { cursor: move; cursor: -webkit-grabbing; } ``` --- #### `filter` option ```js Sortable.create(list, { filter: ".js-remove, .js-edit", onFilter: function (evt) { var item = evt.item, ctrl = evt.target; if (Sortable.utils.is(ctrl, ".js-remove")) { // Click on remove button item[removed].removeChild(item); // remove sortable item } else if (Sortable.utils.is(ctrl, ".js-edit")) { // Click on edit link // ... } } }) ``` --- #### `ghostClass` option Class name for the drop placeholder (default `sortable-ghost`). Demo: http://jsbin.com/hunifu/4/edit?css,js,output ```css .ghost { opacity: 0.4; } ``` ```js Sortable.create(list, { ghostClass: "ghost" }); ``` --- #### `chosenClass` option Class name for the chosen item (default `sortable-chosen`). Demo: http://jsbin.com/hunifu/3/edit?html,css,js,output ```css .chosen { color: #fff; background-color: #c00; } ``` ```js Sortable.create(list, { delay: 500, chosenClass: "chosen" }); ``` --- #### `forceFallback` option If set to `true`, the Fallback for non HTML5 Browser will be used, even if we are using an HTML5 Browser. This gives us the possibility to test the behaviour for older Browsers even in newer Browser, or make the Drag 'n Drop feel more consistent between Desktop , Mobile and old Browsers. On top of that, the Fallback always generates a copy of that DOM Element and appends the class `fallbackClass` defined in the options. This behaviour controls the look of this 'dragged' Element. Demo: http://jsbin.com/yacuqib/edit?html,css,js,output --- #### `fallbackTolerance` option Emulates the native drag threshold. Specify in pixels how far the mouse should move before it's considered as a drag. Useful if the items are also clickable like in a list of links. When the user clicks inside a sortable element, it's not uncommon for your hand to move a little between the time you press and the time you release. Dragging only starts if you move the pointer past a certain tolerance, so that you don't accidentally start dragging every time you click. 3 to 5 are probably good values. --- #### `scroll` option If set to `true`, the page (or sortable-area) scrolls when coming to an edge. Demo: - `window`: http://jsbin.com/tutuzeh/edit?html,js,output - `overflow: hidden`: http://jsbin.com/kolisu/edit?html,js,output --- #### `scrollFn` option Defines function that will be used for autoscrolling. el.scrollTop/el.scrollLeft is used by default. Useful when you have custom scrollbar with dedicated scroll function. --- #### `scrollSensitivity` option Defines how near the mouse must be to an edge to start scrolling. --- #### `scrollSpeed` option The speed at which the window should scroll once the mouse pointer gets within the `scrollSensitivity` distance. --- ### Event object ([demo](http://jsbin.com/xedusu/edit?js,output)) - to:`HTMLElement` — list, in which moved element. - from:`HTMLElement` — previous list - item:`HTMLElement` — dragged element - clone:`HTMLElement` - oldIndex:`Number|undefined` — old index within parent - newIndex:`Number|undefined` — new index within parent #### `move` event object - to:`HTMLElement` - from:`HTMLElement` - dragged:`HTMLElement` - draggedRect:` TextRectangle` - related:`HTMLElement` — element on which have guided - relatedRect:` TextRectangle` --- ### Method ##### option(name:`String`[, value:`*`]):`*` Get or set the option. ##### closest(el:`String`[, selector:`HTMLElement`]):`HTMLElement|null` For each element in the set, get the first element that matches the selector by testing the element itself and traversing up through its ancestors in the DOM tree. ##### toArray():`String[]` Serializes the sortable's item `data-id`'s (`dataIdAttr` option) into an array of string. ##### sort(order:`String[]`) Sorts the elements according to the array. ```js var order = sortable.toArray(); sortable.sort(order.reverse()); // apply ``` ##### save() Save the current sorting (see [store](#store)) ##### destroy() Removes the sortable functionality completely. --- <a name="store"></a> ### Store Saving and restoring of the sort. ```html <ul> <li data-id="1">order</li> <li data-id="2">save</li> <li data-id="3">restore</li> </ul> ``` ```js Sortable.create(el, { group: "localStorage-example", store: { /** * Get the order of elements. Called once during initialization. * @param {Sortable} sortable * @returns {Array} */ get: function (sortable) { var order = localStorage.getItem(sortable.options.group.name); return order ? order.split('|') : []; }, /** * Save the order of elements. Called onEnd (when the item is dropped). * @param {Sortable} sortable */ set: function (sortable) { var order = sortable.toArray(); localStorage.setItem(sortable.options.group.name, order.join('|')); } } }) ``` --- <a name="bs"></a> ### Bootstrap Demo: http://jsbin.com/qumuwe/edit?html,js,output ```html  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css"/>  [removed][removed]  <ul id="simpleList" class="list-group"> <li class="list-group-item">This is <a href="http://rubaxa.github.io/Sortable/">Sortable</a></li> <li class="list-group-item">It works with Bootstrap...</li> <li class="list-group-item">...out of the box.</li> <li class="list-group-item">It has support for touch devices.</li> <li class="list-group-item">Just drag some elements around.</li> </ul> [removed] // Simple list Sortable.create(simpleList, { /* options */ }); [removed] ``` --- ### Static methods & properties ##### Sortable.create(el:`HTMLElement`[, options:`Object`]):`Sortable` Create new instance. --- ##### Sortable.active:`Sortable` Link to the active instance. --- ##### Sortable.utils * on(el`:HTMLElement`, event`:String`, fn`:Function`) — attach an event handler function * off(el`:HTMLElement`, event`:String`, fn`:Function`) — remove an event handler * css(el`:HTMLElement`)`:Object` — get the values of all the CSS properties * css(el`:HTMLElement`, prop`:String`)`:Mixed` — get the value of style properties * css(el`:HTMLElement`, prop`:String`, value`:String`) — set one CSS properties * css(el`:HTMLElement`, props`:Object`) — set more CSS properties * find(ctx`:HTMLElement`, tagName`:String`[, iterator`:Function`])`:Array` — get elements by tag name * bind(ctx`:Mixed`, fn`:Function`)`:Function` — Takes a function and returns a new one that will always have a particular context * is(el`:HTMLElement`, selector`:String`)`:Boolean` — check the current matched set of elements against a selector * closest(el`:HTMLElement`, selector`:String`[, ctx`:HTMLElement`])`:HTMLElement|Null` — for each element in the set, get the first element that matches the selector by testing the element itself and traversing up through its ancestors in the DOM tree * clone(el`:HTMLElement`)`:HTMLElement` — create a deep copy of the set of matched elements * toggleClass(el`:HTMLElement`, name`:String`, state`:Boolean`) — add or remove one classes from each element --- <a name="cdn"></a> ### CDN ```html  [removed][removed]  [removed][removed] ``` --- <a name="jq"></a> ### jQuery compatibility To assemble plugin for jQuery, perform the following steps: ```bash cd Sortable npm install grunt jquery ``` Now you can use `jquery.fn.sortable.js`: (or `jquery.fn.sortable.min.js` if you run `grunt jquery:min`) ```js $("#list").sortable({ /* options */ }); // init $("#list").sortable("widget"); // get Sortable instance $("#list").sortable("destroy"); // destroy Sortable instance $("#list").sortable("{method-name}"); // call an instance method $("#list").sortable("{method-name}", "foo", "bar"); // call an instance method with parameters ``` And `grunt jquery:mySortableFunc` → `jquery.fn.mySortableFunc.js` --- ### Contributing (Issue/PR) Please, [read this](CONTRIBUTING.md). --- ## MIT LICENSE Copyright 2013-2017 Lebedev Konstantin <ibnRubaXa@gmail.com> http://rubaxa.github.io/Sortable/ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

这个错误通常发生在程序中使用了一个单独的 `else` 语句，而没有配合一个 `if` 语句使用。这通常是因为代码中出现了语法错误，例如漏掉了 `if` 语句，或者是因为代码块的嵌套层次不正确造成的。要解决这个错误，你需要检查你的代码，并确保每个 `else` 语句都与一个匹配的 `if` 语句配合使用。

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[Error] 'else' without a previous 'if'是什么意思

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