javascript - 从每次都会更改的文本框的值创建一个组合框
问题描述
<html>
<head>
<script src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
</head>
<body>
<input name="textbox2" id="edValue" type="text" onInput="edValueKeyPress()"><br>
<input name="textbox3" id="textbox3" ><br>
<p/>
</body>
<script type="text/javascript">
function edValueKeyPress() {
var edValue = document.getElementById("edValue");
var s = edValue.value;
textbox3.value=s.concat('world');;
}
</script>
<script type="text/javascript">
$(document).ready(function() {
var data = { 'Country1': 'Sri Lanka', 'Country2': 'USA', 'Country3': 'Australia', 'Country4': 'Newzeland'};
var s = $('<select id="combo" />');
for(var val in data) {
$('<option />', {value: val, text: data[val]}).appendTo(s);
}
s.appendTo('p');
//when we select an item from dropdown or combobox then alert that value
$(document).on('change',"#combo", function(){
alert(this.value);
});
});
</script>
</html>
我想填充一个像下面这样的组合框,在 textbox3 中的每次更改值时,每次都会更改 textbox2
<select id="combo">
<option value="Country1">Sri Lanka (value from textbox3) </option>
<option value="Country2">USA (value from textbox3) </option>
<option value="Country3">Australia (value from textbox3)</option>
<option value="Country4">Newzeland (value from textbox3)</option>
</select>
这意味着每次组合框值都应随文本框值而变化。
现在仅更改仅影响 textbox3 仅
解决方案
希望这对您有所帮助。
function edValueKeyPress() {
var edValue = document.getElementById("edValue");
var s = edValue.value;
textbox3.value = s.concat('world');
var getValueTextbox = document.getElementById("textbox3").value;
make_combobox(getValueTextbox);
}
make_combobox('');
function make_combobox(textbox) {
$('#combo').remove();
var data = {
'Country1': 'Sri Lanka',
'Country2': 'USA',
'Country3': 'Australia',
'Country4': 'Newzeland'
};
var s = $('<select id="combo" />');
for (var val in data) {
$('<option />', {
value: val,
text: data[val] + '=>' + textbox
}).appendTo(s);
}
s.appendTo('p');
//when we select an item from dropdown or combobox then alert that value
$(document).on('change', "#combo", function() {
alert(this.value);
});
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input name="textbox2" id="edValue" type="text" onInput="edValueKeyPress()"><br>
<input name="textbox3" id="textbox3"><br>
<p/>
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