JavaScript - 从数组中的多个输入获取值
问题描述：
我试图从数组中使用相同id的多个输入获取值。
我已经使用过该论坛，但还没有为我找到解决方案。
I am trying to get the value from muliple inputs with the same id in an array. I already used the forum, but haven't find a solution for me.
Exmaple
<input type="hidden" value="'+image_url+'" name="webcampics[]" id="webcampics">
<input type="hidden" value="'+image_url+'" name="webcampics[]" id="webcampics">
<input type="hidden" value="'+image_url+'" name="webcampics[]" id="webcampics">
<input type="hidden" value="'+image_url+'" name="webcampics[]" id="webcampics">
var elem = document.getElementById("webcampics");
var names = [];
for (var i = 0; i < elem.length; ++ i) {
names += elem[i]+'|';
}
var webcamval = names;
答
你不应该有相同的元素文档中的id 。根据规范， ID 在整个标记中必须是唯一的。如果你这样做的话，像 document.getElementById 这样的方法只会匹配第一次出现的情况。
You shouldn't have elements with identical id's within the document. ID's have to be unique throughout your entire markup, by specification. If you do it anyways, methods like document.getElementById will only match the very first occurence for instance.
使用一个类而不是 ids 。
<input type="hidden" value="'+image_url+'" name="webcampics[]" class="webcampics">
<input type="hidden" value="'+image_url+'" name="webcampics[]" class="webcampics">
<input type="hidden" value="'+image_url+'" name="webcampics[]" class="webcampics">
<input type="hidden" value="'+image_url+'" name="webcampics[]" class="webcampics">
var inputs = document.getElementsByClassName( 'webcampics' ),
names = [].map.call(inputs, function( input ) {
return input.value;
}).join( '|' );