我试图将选中复选框的结果存储在本地存储中,但当我尝试保存时,我会收到上面提到的错误。
不太确定什么是未定义的,因为我在代码中看到了属性。这是代码:
var getCheckboxValue = function (){
var checkboxes = document.forms[0].features;
for(var i=0, j=checkboxes.length; i<j; i++){
if(checkboxes[i].checked){
console.log(checkboxes[i].value);
//featuresValue = $("features").value();
}else{
checkboxes = "No"
}
}
}
var storeData = function (){
var id = Math.floor(Math.random()*10000001);
//getSelectedRadio();
getCheckboxValue();
var item = {};
item.brand = ["Brand",$("brand").value];
item.model = ["Model",$("model").value];
item.comments = ["comments",$("comments").value];
//item.acoustic = ["acoustic", acousticValue];
item.features = ["features",checkboxes];
//Save data into local storage: Use Stringify to convert our object to a string
localStorage.setItem(id,JSON.stringify(item));
alert("Contact Saved!");
}
//set link & submit click events
var save = $("button");
save.addEventListener("click", storeData);
这是相关的html:
<li>Features:
<ul>
<li><input type="checkbox" name="features" value = "Cutaway" id="cutaway" /><label for="cutaway">Cutaway</label></li>
<li><input type="checkbox" name="features" value = "Finished" id="finished" /><label for="finished">Finished</label></li>
<li><input type="checkbox" name="features" value = "Inlay" id="inlay" /><label for="inlay">Inlay</label></li>
<li><input type="checkbox" name="features" value = "Wide Neck" id="wneck" /><label for="wneck">Wide Neck</label></li>
<li><input type="checkbox" name="features" value = "Left-handed" id="lhanded" /><label for="lhanded">Left-handed</label></li>
</ul>
</li>
或者,这里有一个链接到github:上的完整代码
https://github.com/b80266/VFW-Project-2/blob/master/additem.html
https://github.com/b80266/VFW-Project-2/blob/master/main.js
问题是您在这里覆盖了checkboxes
(表单中复选框的原始集合)的值:
}else{
checkboxes = "No"
}
这是循环内部的。。。正在通过CCD_ 2进行迭代的循环。它现在迭代字符串"No"中的字符,而不是最初检索到的元素集合。这个字符串只有2个字符长,而原始循环的缓存值checkboxes.length
(5个元素)存储在j
中,每次迭代都不会更新,这意味着它将循环经过i = 1
,访问第三、第四和第五个索引,这些索引现在尚未定义。
另一个"问题"是,在storeData
函数中,您正在调用getCheckboxValue
,但没有将其存储在任何位置。。。那么稍后您将引用某个checkboxes
变量item.features = ["features",checkboxes];
。您需要存储结果,然后使用该变量。这里有一个演示,似乎可以与一些假设的HTML:一起工作
var $ = function (id) {
return document.getElementById(id);
};
var getCheckboxValue = function () {
var checkboxes = document.forms[0].features;
for (var i = 0, j = checkboxes.length; i < j; i++) {
if (checkboxes[i].checked) {
console.log(checkboxes[i].value + " is checked");
} else {
//checkboxes = "No";
console.log(checkboxes[i].value + " is not checked");
}
}
};
var storeData = function () {
var id = Math.floor(Math.random()*10000001);
var checkedBoxes = getCheckboxValue();
var item = {};
item.brand = ["Brand",$("brand").value];
item.model = ["Model",$("model").value];
item.comments = ["comments",$("comments").value];
item.features = ["features",checkedBoxes];
//Save data into local storage: Use Stringify to convert our object to a string
localStorage.setItem(id,JSON.stringify(item));
alert("Contact Saved!");
};
//set link & submit click events
var save = $("button");
save.addEventListener("click", storeData, false);
演示:http://jsfiddle.net/jmUXY/1/
根据Ian的建议,您可以检查任何形式的所有收音机。参见示例:
jQuery(document).ready(function() {
$("input[type='radio']").change(function() {
if (this.checked) {
//Do stuff
//console.log("foi clicado");
var marcados = 0;
var naoMarcados = 0;
//conta numero de checados
var inputElems = document.getElementsByTagName("input"),
count = 0;
for (var i = 0; i < inputElems.length; i++) {
if (inputElems[i].type == "radio" && inputElems[i].checked === true) {
count++;
marcados = count;
} else {
naoMarcados = naoMarcados + 1;
}
}
$("#marcados").html("Total de Marcados: " + marcados);
$("#naomarcados").html("Total de Não Marcados: " + naoMarcados);
}
});
});
<script
src="https://code.jquery.com/jquery-3.2.1.js"
integrity="sha256-DZAnKJ/6XZ9si04Hgrsxu/8s717jcIzLy3oi35EouyE="
crossorigin="anonymous"></script>
<p>
FORM 1
</p>
<form id="1">
<input type="radio">Em grau muito alto
<input type="radio">Em grau alto
<input type="radio">Em grau médio
<input type="radio" CHECKED>Em grau baixo
<input type="radio">Em grau muito baixo
<input type="radio">Não observo
</form>
<hr>
<p>
FORM 2
</p>
<form id="2">
<input type="radio">Em grau muito alto
<input type="radio">Em grau alto
<input type="radio">Em grau médio
<input type="radio">Em grau baixo
<input type="radio">Em grau muito baixo
<input type="radio">Não observo
</form>
<hr>
<div id="marcados"></div>
<div id="naomarcados"></div>