jquery模擬a標籤的click事件,無法實現跳轉
使用jquery模擬a標籤的click事件,無法觸發其預設行為。即click()或trigger('click')無法觸發href跳轉。
<a id="aBtn" href="https://www.car-me.com/">去卡咪官網</a> $('#aBtn').click();//無法跳轉,不生效 $('$aBtn').trigger('click');//同樣無法跳轉,不生效 複製程式碼
問題原因
jquery內部實現click或trigger方法時,並未真正模擬使用者點選事件,只是模擬了事件物件及冒泡的觸發。(最後附有jquery實現原始碼供參考)
解決方案
解決思路:在原生dom觸發click事件或利用事件冒泡來解決。
- 原生dom觸發click
<a id="aBtn" href="https://www.car-me.com/">去卡咪官網</a> document.querySelector('#aBtn').click();//原生dom觸發 或者 $('#aBtn')[0].click();//jquery物件轉為dom物件再觸發 複製程式碼
- 利用子元素事件冒泡
<a id="aBtn" href="https://www.car-me.com/"> <span id="spanBtn">去卡咪官網</span> </a> $('#spanBtn').click();//或者 $('#spanBtn').trigger('click'); 複製程式碼
jquery trigger()實現原始碼(8159行-8304行)
ofollow,noindex">原始碼連結地址
關鍵摘要:
// Fire handlers on the event path (8237行) i = 0; while ( ( cur = eventPath[ i++ ] ) && !event.isPropagationStopped() ) { lastElement = cur; event.type = i > 1 ? bubbleType : special.bindType || type; // jQuery handler handle = ( dataPriv.get( cur, "events" ) || {} )[ event.type ] && dataPriv.get( cur, "handle" ); if ( handle ) { //******自身trigger('click')或click()時,會呼叫快取列表裡的事件回撥函式,但未執行elem.click()****** handle.apply( cur, data ); } // Native handler handle = ontype && cur[ ontype ]; if ( handle && handle.apply && acceptData( cur ) ) { event.result = handle.apply( cur, data ); if ( event.result === false ) { event.preventDefault(); } } } 複製程式碼
// If nobody prevented the default action, do it now (8263行) if ( !onlyHandlers && !event.isDefaultPrevented() ) { if ( ( !special._default || special._default.apply( eventPath.pop(), data ) === false ) && acceptData( elem ) ) { // Call a native DOM method on the target with the same name as the event. // Don't do default actions on window, that's where global variables be (#6170) if ( ontype && isFunction( elem[ type ] ) && !isWindow( elem ) ) { // Don't re-trigger an onFOO event when we call its FOO() method tmp = elem[ ontype ]; if ( tmp ) { elem[ ontype ] = null; } // Prevent re-triggering of the same event, since we already bubbled it above jQuery.event.triggered = type; if ( event.isPropagationStopped() ) { lastElement.addEventListener( type, stopPropagationCallback ); } //******子元素trigger('click')或click(),會執行elem.click()****** elem[ type ](); if ( event.isPropagationStopped() ) { lastElement.removeEventListener( type, stopPropagationCallback ); } jQuery.event.triggered = undefined; if ( tmp ) { elem[ ontype ] = tmp; } } } } 複製程式碼