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Javascript error cannot read property style of undefined

It does mean, it doesn' t find element you are looking for. It' s simply because in html you are using classes < div class= " red" >. and ids in javascript document. addEventListener( ' click', function( ev) { f. clientX- 25) + ' px' ; / / ← エラー 表示箇所 f. なお、 参考にされたjsfiddleは、 元々JavaScriptの動作を onloadに設定してある( JavaScriptペインの右上の歯車のマークから. html: 9 Uncaught TypeError: Cannot read property ' style' of null(. getElementById( " main" ) ; / * 関数の外に持ってくる* / } function hogehoge( style) { hoge. color = " # FFFFFF" ; } ;. 文字だよ< / div> < INPUT type= " button" value= " 文字を消すボタン" onClick= " hogehoge( style) " > < / INPUT> < / body> < / html>. Did you mean document. getElementById( ' btn1' ). backgroundColor = ' red' ;.

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  • Video:Read error undefined

    Cannot style error

    So something like this? I did it with class names rather than id' s, but is it possible you' ve misspelled the id? Edited to hide by ID, and show by class. Best of both worlds. var hideIt = function( ) { / / var hideMe = document. Cannot read property ' columns' of undefined. これは、 JavaScript の典型的なエラー メッセージの一つで、 columnsプロパティを持っているはずのオブジェクト変数が null または undefined になっていることを示しています。 例えば、 作成. You are placing the < script> file before the slides. So when your script is executed the first time, the markup does not yet exist in DOM. Because your slides do not exist, after the initial for ( which does nothing), you get to your script, this part: document.

    getElementById( ' Noite' ). must be returning null and you are also attempting to set the display property to an invalid value. There are a couple of possible reasons for this first part to be null. You are running the. Don' t place the hash in id ( # ) : document. getElementById( ' iframetest' ). As per your comment, you can do like this: function select( ) { document. display = ' block'? ' none' : ' block' ; }. Add your < script> to the bottom of your < body>, or add an event listener for DOMContentLoaded following this StackOverflow question. If that script executes in the < head> section of the code, document.