問題描述
我有這個 html 代碼:
I have this html code:
<table border="" cellpadding="3" cellspacing="0" id="mytable">
<tbody><tr><td>Song:</td> <td><input type="text" name="song" maxlength="64" size="48" /> </td></tr>
<tr><td>Artist:</td> <td><input type="text" name="artist" maxlength="16" size="48" /> </td></tr>
如何獲得歌曲"和藝術家"的值?我試過了:
How do I get the values of "song" and "artist"? I have tried:
var elTableCells = mytable.getElementsByTagName("td");
alert(elTableCells[2].value);
alert(elTableCells[4].value);
但即使文本框中有文本，我也會不斷收到未定義"
but I keep getting "undefined" even when there is text inside the textbox
推薦答案
首先，td元素沒有value屬性，所以調用.value 他們不會做任何事情.其次，該值實際上在 input 元素上，因此您需要改為 mytable.getElementsByTagName('input') .更好的是給你的輸入字段ID，然后使用getElementById.這意味著您可以在不破壞 JS 的情況下更改 HTML.
First, td elements don't have a value attribute, so calling .value on them won't do a thing. Second, the value is actually on the input element, so you need to do mytable.getElementsByTagName('input') instead. Even better would be to give your input fields ids and then use getElementById. This would mean you could alter your HTML without your JS breaking.
這篇關于在 Javascript 中獲取文本框的值的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！