我正在尝试使用jquery创建一个搜索表单，以执行以下任务：
但问题是：
var max_fields = 3; //maximum input boxes allowed
var wrapper = $(".input_fields_wrap"); //Fields wrapper
var addButton = $("#form-add"); //Add button ID
var form = $('#main-form');
var x = 1; //initlal text box count
$('#alarm_action').change(function (e) {
if ($("#alarm_action").val() == "listofcompany") {
$('#filefield').show();
$("#myTextarea").hide();
$("#showForProg").hide();
} else if ($("#alarm_action").val() == "runprogram") {
$('#filefield').hide();
$("#myTextarea").hide();
$("#showForProg").show();
} else {
$('#filefield').hide();
$("#myTextarea").show();
$("#showForProg").hide();
}
});
$(addButton).click(function(e){ //on add input button click
e.preventDefault();
if(x < max_fields){ //max input box allowed
x++; //text box increment
$(wrapper).append('<div class="form-field">\
<select class="removeDuplication" name="searchtype" id="alarm_action" required>\
<option value="cityname">City Name</option>\
<option value="listofcompany">Company</option>\
<option value="runprogram">Run Program</option></select>\
<body onload="setProg();">\
<select name="searchtermorg" id="showForProg" style="display: none;"></select>\
</body>\
<input id="filefield" type="file" name="foofile" style="display: none;"/>\
<textarea id="myTextarea" name="something" ></textarea>\
<a href="#" class="remove_field">Remove</a>\
</div>'); //add input box
} else {
alert("Sorry, you have reached maximum add options.");
}
});
$(wrapper).on("click",".remove_field", function(e){ //user click on remove text
e.preventDefault();
$(this).parent('div').remove();
x--;
});
$(document).on('change','select.removeDuplication',function(e) {
e.preventDefault();
var cI = $(this);
var others=$('select.removeDuplication').not(cI);
$.each(others,function(){
if($(cI).val()==$(this).val() && $(cI).val()!="") {
$(cI).val('');
alert($(this).find('option:selected').text()+' already selected.');
}
});
});
form.on('submit', function(e) {
e.preventDefault()
var queries = [];
var slectedall=true;
var fillupfield=true;
form.find('.form-field').each(function(index, field) {
var query = {};
query.type = $(field).find('select').val();
console.log(query.type);
if (query.type !=""){
if (query.type == "listofcompany") {
query.value =$(field).find('#filefield').val();
} else if (query.type == "runprogram") {
query.value =$(field).find('#showForProg').val();
} else {
query.value =$(field).find('textarea').val().replace(/\n/g, '\\n');
}
queries.push(query);
} else{
slectedall=false;
}
});
var url = window.location.href;
url+="/search/advanced/";
for (i = 0; i < queries.length; i += 1) {
var query = queries[i];
var ampOrQ = (i === 0) ? "?" : "&";
if (query.value.trim() ===""){
fillupfield=false;
} else {
url += ampOrQ + query.type + "=" + query.value;
}
};
if (slectedall===false){
alert('Please select option.');
} else {
if (fillupfield===false){
alert('Input can not be left blank');
} else {
//alert(url);
window.location.href = url;
}
}
});
var progarray = ['Python','Java','R'];
function setProg() {
var newOptions=progarray;
var newValues=progarray;
selectField = document.getElementById("showForProg");
selectField.options.length = 0;
for (i=0; i<newOptions.length; i++)
{
selectField.options[selectField.length] = new Option(newOptions[i], newValues[i]);
}
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<form id="main-form" class="navbar-form" action="" method="get" enctype='multipart/form-data'>
<div class="input_fields_wrap">
<div class="form-field">
<select class="removeDuplication" name='searchtype' id="alarm_action" required>
<option value="cityname">City Name</option>
<option value="listofcompany">Company</option>
<option value="runprogram">Run Program</option></select>
<body onload="setProg();">
<select name="searchtermorg" id="showForProg" style="display: none;"></select>
</body>
<input id="filefield" type="file" name="foofile" style="display: none;"/>
<textarea id="myTextarea" name="something"></textarea>
</div>
</div>
<input class="btn btn-secondary" type="button" value="Add" id="form-add">
<input class="btn btn-primary" type="submit" value="Submit">
</form>
有人可以帮我解决这些问题吗？谢谢
答案 0 :(得分：1)
我们当前代码的问题：
id应该是唯一的。但是在这里，每次克隆元素时都要重复元素id。使用class代替id。$.on将事件绑定到动态添加的元素（例如，下拉更改事件）通过修复上述问题，我已经解决了你提到的问题。但正如我所说，在项目中使用之前需要做很多清理工作。
var max_fields = 3; //maximum input boxes allowed
var wrapper = $(".input_fields_wrap"); //Fields wrapper
var addButton = $("#form-add"); //Add button ID
var form = $('#main-form');
var x = 1; //initlal text box count
var progarray = ['Python', 'Java', 'R'];
wrapper.append($("#content-template").html());
//alert($(".showForProg").length);
setProg($(".showForProg"));
$(document).on('change', '.alarm_action', function(e) {
var $container = $(this).parents('.form-field');
if ($(this).val() == "listofcompany") {
$('.filefield', $container).show();
$(".myTextarea", $container).hide();
$(".showForProg", $container).hide();
} else if ($(this).val() == "runprogram") {
$('.filefield', $container).hide();
$(".myTextarea", $container).hide();
$(".showForProg", $container).show();
} else {
$('.filefield', $container).hide();
$(".myTextarea", $container).show();
$(".showForProg", $container).hide();
}
});
$(addButton).click(function(e) { //on add input button click
e.preventDefault();
if (x < max_fields) { //max input box allowed
x++; //text box increment
wrapper.append($("#content-template").html());
setProg($(".showForProg").last());
} else {
alert("Sorry, you have reached maximum add options.");
}
});
$(wrapper).on("click", ".remove_field", function(e) { //user click on remove text
e.preventDefault();
$(this).parent('div').remove();
x--;
});
$(document).on('change', 'select.removeDuplication', function(e) {
e.preventDefault();
var cI = $(this);
var others = $('select.removeDuplication').not(cI);
$.each(others, function() {
if ($(cI).val() == $(this).val() && $(cI).val() != "") {
$(cI).val('');
alert($(this).find('option:selected').text() + ' already selected.');
}
});
});
form.on('submit', function(e) {
e.preventDefault()
var queries = [];
var slectedall = true;
var fillupfield = true;
form.find('.form-field').each(function(index, field) {
var query = {};
query.type = $(field).find('select').val();
console.log(query.type);
if (query.type != "") {
if (query.type == "listofcompany") {
query.value = $(field).find(',filefield').val();
} else if (query.type == "runprogram") {
query.value = $(field).find(',showForProg').val();
} else {
query.value = $(field).find('textarea').val().replace(/\n/g, '\\n');
}
queries.push(query);
} else {
slectedall = false;
}
});
var url = window.location.href;
url += "/search/advanced/";
for (i = 0; i < queries.length; i += 1) {
var query = queries[i];
var ampOrQ = (i === 0) ? "?" : "&";
if (query.value.trim() === "") {
fillupfield = false;
} else {
url += ampOrQ + query.type + "=" + query.value;
}
};
if (slectedall === false) {
alert('Please select option.');
} else {
if (fillupfield === false) {
alert('Input can not be left blank');
} else {
//alert(url);
window.location.href = url;
}
}
});
function setProg($programDropdown) {
$.each(progarray , function(key, value) {
$programDropdown
.append($("<option></option>")
.attr("value",value)
.text(value));
});
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<form id="main-form" class="navbar-form" action="" method="get" enctype='multipart/form-data'>
<div class="input_fields_wrap">
</div>
<input class="btn btn-secondary" type="button" value="Add" id="form-add">
<input class="btn btn-primary" type="submit" value="Submit">
</form>
<script type="text/template" id="content-template">
<div class="repeat-container">
<div class="form-field">
<select class="alarm_action removeDuplication" name='searchtype' required>
<option value="cityname">City Name</option>
<option value="listofcompany">Company</option>
<option value="runprogram">Run Program</option></select>
<body>
<select name="searchtermorg" class="showForProg" style="display: none;"></select>
</body>
<input class="filefield" type="file" name="foofile" style="display: none;" />
<textarea class="myTextarea" name="something"></textarea>
</div>
</div>
</script>