Javascript getElementById(array[x])？
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getElementById(array[x])?
提问by Strawberry
I'm trying to put an array in to getElementById for a loop purpose. It seems to be not working, how can I do this?
我正在尝试将一个数组放入 getElementById 以用于循环目的。它似乎不起作用，我该怎么做？
Edit: Sorry folks It says undefined.
编辑：对不起，伙计们它说未定义。
var lol=new Array( "test", "test2" );
var x = 0;
while( x == 4 ) {
number = parseInt(document.getElementById(lol[x]).value);
x++;
}
And i have inputs id named test and test2.
我有名为 test 和 test2 的输入 ID。
回答by Aaron
Your while loop only works if x==4. Change this to:
您的 while 循环仅在 x==4 时有效。将此更改为：
while(x < lol.length)
To loop through all the elements in the array. Better yet, this will condense your loop:
遍历数组中的所有元素。更好的是，这将压缩您的循环：
var lol=new Array( "test", "test2" );
for( var x = 0; x < lol.length; x++ ) {
number = parseInt(document.getElementById(lol[x]).value);
}
回答by cjstehno
Try taking your array out of the quotes...
尝试从引号中取出数组...
document.getElementById(lol[x]).value
The quotes turn it into a static string "lol[x]", when you want the value of the lol array at x index.
当您想要 x 索引处的 lol 数组的值时，引号会将其转换为静态字符串“lol[x]”。
This replaces my earlier, less informed answer.
这取代了我之前的、不太了解的答案。
Hope this helps
希望这可以帮助
回答by Anonymous
You say you have number = parseInt(document.getElementById("lol[x]").value);
你说你有 number = parseInt(document.getElementById("lol[x]").value);
"lol[x]"is a string with that literal value, not the value thatlolholds at indexx. UsegetElementById(lol[x])parseIntmay do unexpected things when you don't pass a radix. Use something likeparseInt(document.getElementById(lol[x]).value, 10)
"lol[x]"是具有该字面值的字符串，而不是lol保存在 index 处的值x。用getElementById(lol[x])parseInt不传递基数时可能会做意想不到的事情。使用类似的东西parseInt(document.getElementById(lol[x]).value, 10)
Finally, you aren't checking whether the element exists. Do something like:
最后，您不是在检查元素是否存在。做类似的事情：
var element = document.getElementById(lol[x]);
if (element) {
number = parseInt(element.value, 10);
} else {
// handle error or throw exception
}
