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JavaScript Bible 5th Edition 2004 phần 3

Do đó, nó đảm bảo rằng chỉ IE4 hoặc sau này có thể thực hiện các kịch bản khi sự kiện xảy ra. Nhưng các thẻ và các thuộc tính có chứa rất nhiều mã nguồn chi phí cho mỗi kịch bản của đối tượng, | Chapter 15 Generic HTML Element Objects 321 elementObjectCollection.tagsQ script head body onload init h1 getExpression setExpression recalc Methods h1 hr p This clock uses Dynamic Properties to calculate bar width and time numbers p table border 0 tr th Hours th td span id hoursBlock style background-color red span nbsp span id hoursLabel span td tr tr th Minutes th td span id minutesBlock style background-color yellow span nbsp span id minutesLabel span td tr tr th Seconds th td span id secondsBlock style background-color green span nbsp span id secondsLabel span td tr table hr form input type button value Show Hours number innerHTML Expression onclick showExpr form body html Related Items document.recalc removeExpression setExpression methods. swapNode otherNodeObject Returns Node object reference. Compatibility WinIE5 MacIE- NN- Moz- Safari- The swapNode method exchanges the positions of two nodes within an element hierarchy. Contents of both nodes are preserved in their entirety during the exchange. The single parameter must be a valid node object perhaps created with document.createElement or copied from an existing node . A return value is a reference to the object whose swapNode method was invoked. Example See Listing 15-31 the replaceNode method for an example of the swapNode method in action. Related Items removeChild removeNode replaceChild replaceNode methods. tagsCtagName Returns Array of element objects. Compatibility WinIE4 MacIE4 NN- Moz- Safari- 322 Part III Document Objects Reference elementObjectCollection.tagsQ The tags method does not belong to every element but it is a method of every collection of objects such as all forms and elements . The method is best thought of as a kind of filter for the elements that belong to the current collection. For example to get an array of all p elements inside a document use this expression document.all.tags P You must pass a parameter string consisting of the tag name you wish to extract from the collection.