Javascript JQuery逻辑未应用于动态创建的html
我已经编写了以下JavaScript/JQuery代码。当从HTML下拉菜单中选择一个选项时,会触发此代码。它将所选值与已添加到HTML表中的值进行比较:Javascript JQuery逻辑未应用于动态创建的html,javascript,jquery,html,Javascript,Jquery,Html,我已经编写了以下JavaScript/JQuery代码。当从HTML下拉菜单中选择一个选项时,会触发此代码。它将所选值与已添加到HTML表中的值进行比较: $('#addonSelectOptions').on('change', function(e){ e.preventDefault(); var selectedAddon = $('#addonSelectOptions option:selected').val(); var selectedText = $
$('#addonSelectOptions').on('change', function(e){
e.preventDefault();
var selectedAddon = $('#addonSelectOptions option:selected').val();
var selectedText = $('#addonSelectOptions option:selected').text();
var currentAddons = $('#acg_addons').val();
if(selectedAddon == '0') {
$('#availableAddOns > tbody:last').empty();
$('#availableAddOns > tbody:last').append('<tr id="noaddonShown"><td>No add-ons</td></tr>');
$('#acg_addons').val(' ');
} else {
var addonStrings = currentAddons.toString();
var addonCheck = 'addOn-'+selectedAddon;
$(".selectedAddonTableTR").each(function() {
var rowID = $(this).attr('id');
if(rowID == addonCheck) {
alert('You have already added this Add On to this Game');
return false;
} else {
$('#noaddonShown').empty();
$('#availableAddOns > tbody:last').append('<tr id="addOn-'+selectedAddon+'" class="selectedAddonTableTR"><td>'+selectedText+'</td></tr>');
var addons = $('#acg_addons').val();
$('#acg_addons').val(addons+''+selectedAddon+',');
}
});
}
});
如果我从下拉列表中选择了一个已经存在于表中的选项,则会显示该警报的目的。然后,如果我选择了一个不在HTML表中的选项,它会将它添加到正确的表中。但是,如果选择新添加的选项,则会触发警报,但随后会再次将其添加到表中。它只应该显示警报,而不是第二次添加
我在代码中遗漏了什么来防止这种情况
编辑:
基于缺少MCVE,以下是下拉HTML:
<select id="addonSelectOptions">
<option value="0">--No Addon--</option>
<option value="2">Add On 1</option>
<option value="1">Add On 2</option>
</select>
这也是使用的HTML表:
<table id="availableAddOns">
<tbody>
<tr id="addOn-1" class="selectedAddonTableTR">
<td>Add On 1</td>
</tr>
</tbody>
</table>
这会让你走上正确的道路。你没有很好地解释你的问题,但我认为这会让你走上正确的方向。请阅读我的评论,如果您需要更详细的解释,请告诉我发生了什么
$('#addonSelectOptions').on('change', function(e){
e.preventDefault();
var select = $(this), //Don't use var declaration more than once
selectedAddon = $(select).val(),
selectedAddonIdString = 'addOn-' + selectedAddon,
selectedText = $(select).find('option:selected').text(),
availableAddOns = $('#availableAddOns'), // Cache your DOM elemtns, don't select them more than once
currentAddonArr = []; //Use an array to store multiple values... I don't know what you were trying to do with addons = $('#acg_addons').val();
if(selectedAddon == '0') {
$(availableAddOns).find('> tbody:last').empty();
//You didn't prove any HTML, but you can't dynamically add an HTML element here, but then reference it below since it may not exist
//If this part of the if statement never fires, the #noaddonShown element will not exist
$(availableAddOns).find('> tbody:last').append('<tr id="noaddonShown"><td>No add-ons</td></tr>'); // Rework this
} else {
if($.inArray(selectedAddonIdString, currentAddonArr) === -1) {
//You don't need to run empty funtions on an element that will simply show the same information over and over again if a condition is met.
//Instead use $('#noaddonShown').hide(); $('#noaddonShown').show(); to toggle the element
$('#noaddonShown').empty(); // rework this
$(availableAddOns).find('> tbody:last').append('<tr id="addOn-'+selectedAddon+'" class="selectedAddonTableTR"><td>'+selectedText+'</td></tr>');
//var addons = $('#acg_addons').val(); not needed
//$('#acg_addons').val(addons+''+selectedAddon+',');
} else {
alert('You have already added this Add On to this Game');
return false;
}
}
});
你缺少了一个MCVE。我添加了缺少的下拉列表和表格HTML,我认为我已经包括了这个。