Javascript 仅允许在我的列表框中包含实数的项目
我有一个下拉列表,当我从下拉列表中选择item时,我的列表框将填充json中的一组项,列表框中的一些项没有reak number值,我只想要那些具有实数值的项。下面是我的javascript。请建议Javascript 仅允许在我的列表框中包含实数的项目,javascript,jquery,html,Javascript,Jquery,Html,我有一个下拉列表,当我从下拉列表中选择item时,我的列表框将填充json中的一组项,列表框中的一些项没有reak number值,我只想要那些具有实数值的项。下面是我的javascript。请建议 $(document).ready(function() { $.ajax({ url: "avb.json", dataType: "json", success: function(obj) { console.lo
$(document).ready(function() {
$.ajax({
url: "avb.json",
dataType: "json",
success: function(obj) {
console.log("obj--", obj)
var jsObject = obj;
var usedNames = [];
$('<option>', {
text: 'Select your Option',
value: '',
selected: 'selected',
disabled: 'disabled',
location: 'fixed'
}).appendTo('#dropdown1')
$.each(obj, function(key, value) {
if (usedNames.indexOf(value.name) == -1) {
$("#dropdown1").append("<option value=" + key + ">" + value.name + "</option>");
usedNames.push(value.name);
}
});
$('#dropdown1').change(function() {
if (!isNaN(this.value) ){
$('#listbox').toggle(this.value != "");
}
});
$('#dropdown1').change(function() {
$('#listbox').empty();
$('<option>', {
text: 'Select your List Option',
value: '',
selected: 'selected',
disabled: 'disabled'
}).appendTo('#listbox');
var selection = $('#dropdown1 :selected').text();
console.log("as".selection);
$.each(jsObject, function(index, value) {
console.log("%o",value)
if (value['name'] == selection) {
var optionHtml = '';
for (var i = 1; i <=20; i++) {
var attr = 'attr' + ('000' + i).substr(-3);
var val = 'val' + ('000' + i).substr(-3);
optionHtml += '<option value="' + attr + '" data-val="'+value[val]+'">' + value[attr] + '</option>';
}
$("#listbox").css("width", "500px")
$("#listbox").css("height", "300px")
$('#listbox').append(optionHtml);
return false;
}
var selectedOption = $(this).find('option:selected');
console.log(selectedOption);
});
});
$("#listbox").on("click", function() {
console.log("asd", $('#listbox option:selected').attr('data-val'));
var zxv = $('#listbox option:selected').attr('data-val')
$(".bar").attr("y",zxv)
console.log("test", $(".bar").attr("y",zxv))
// $(".bar").attr("height",'100')
})
}
});
});
my json
[ {
"name": "ABC",
"date": 1459461600000,
"attr001": "SIGN1",
"val001": "60",
"attr002": "SIGN2",
"val002": "5",
"attr003": "SIGN3",
"val003": "100.00",
"attr004": "SIGN4",
"val004": "0",
"attr005": "SIGN5",
"val005": "Traesnotfound"
},
{
"name": "ABC",
"date": 1461176704000,
"attr001": "SIGN1",
"val001": "200",
"attr002": "SIGN2",
"val002": "70",
"attr003": "SIGN3",
"val003": "100.00",
"attr004": "SIGN4",
"val004": "670",
"attr005": "SIGN5",
"val005": "Traceinvalid"
},
{ "name": "XYZ",
"date": 1459125900000,
"attr001": "VISSE1",
"val001": "100",
"attr002": "VISSE2",
"val002": "7",
"attr003": "VISSE3",
"val003": "300.00",
"attr004": "VISSE4",
"val004": "160",
"attr005": "SIGN5",
"val005": "not found"
},
{ "name": "XYZ",
"date": 1459461600000,
"attr001": "VISSE1",
"val001": "50",
"attr002": "VISSE2",
"val002": "70",
"attr003": "VISSE3",
"val003": "300.00",
"attr004": "VISSE4",
"val004": "230",
"attr005": "SIGN5",
"val005": "found"
},
{ "name": "XYZ",
"date": 1459461900000,
"attr001": "VISSE1",
"val001": "300",
"attr002": "VISSE2",
"val002": "10",
"attr003": "VISSE3",
"val003": "500.00",
"attr004": "VISSE4",
"val004": "350",
"attr005": "SIGN5",
"val005": "not found" } ]
那么您需要对添加到控件中的字符串进行验证 试试这个:
您必须检查值是否为number。如果提供的值不是number,则此函数将返回true,否则返回false。请查看此链接以了解更多详细信息
if (!isNaN(value.name) ) {
$("#dropdown1").append("<option value=" + key + ">" +
value.name + "</option>");
usedNames.push(value.name);
}
从option call bellow函数中删除非十进制值
function removeNonNumberEmptyOptions(){
for(var i=0; i< $("#dropdown1 option").length;i++){
if (isNaN($("#dropdown1 option")[i].value)){
$("#dropdown1 option[value="
+$("#dropdown1 option")[i].value + "]").remove()
}
}
}
签出链接按照您的期望工作
您正在为for循环进行硬编码,它应该是
userPorperties = Object.getOwnPropertyNames(value);
for (var i = 0; i <= userPorperties.length -1; i++) {
if (!isNaN(value[userPorperties[i]]))
optionHtml += '<option value="' + userPorperties[i] + '"
data-val="' + value[userPorperties[i]] + '">'
+ userPorperties[i] + "=>"
+value[userPorperties[i]]+ '</option>';
}
你觉得这个颜色好吗?请在需要的地方添加引号,这样它可以帮助未来的读者和meI告诉你该怎么做:编辑你的帖子并添加缺少的引号我的问题是我想包括所有实数,其中包括小数和整数,而不是其他东西…我不明白在这个给定的链接中发生了什么…请解释。我已经在我的列表框上方添加了if语句但是我的列表框中仍然有一个sign5项,它的值不是整型的,正如你从json中看到的那样。为什么这样做呢?如果你这样做是NanAttr005,它返回true,你必须调用$dropdown1选项[value=attr005]。移除;对列表中的所有项目进行迭代,然后删除非数字值,尝试添加代码,这样我就可以查看它了,但我不知道如何引用json,所以我将脚本的最后一部分放进去。请看一看