[英]Validate that textarea filled and multiselect clicked within form before enabling button
鏈接到相關的小提琴(當前從該stackoverflow 響應中獲取的javascript): https : //jsfiddle.net/5qomb6fe/ 。
HTML
<body>
<div class="container">
<h5>Input Words and Make Selection</h5>
<br>
<form method='post'>
<div class="row"></div>
<textarea class="form-control" id="field" name="words" rows="12"></textarea>
<br>
<select class="form-control" id="type" multiple name="type" size="13">
<option value="">Null</option>
<option value="One">One</option>
<option value="Two">Two</option>
<option value="Three">Three</option>
<option value="Four">Four</option>
<option value="Five">Five</option>
<option value="Six">Six</option>
</select>
<br>
<input class="btn btn-danger" name="button" type="submit" value="Submit", id="keybutton" disabled="disabled">
</form>
</div>
使用Javascript
(function() {
$('form > textarea').keyup(function() {
var empty = false;
$('form > textarea').each(function() {
if ($(this).val() == '') {
empty = true;
}
});
if (empty) {
$('#keybutton').attr('disabled', 'disabled');
} else {
$('#keybutton').removeAttr('disabled');
}
});
})()
雖然這可以在填寫表單時有效地啟用按鈕,但我想知道如何在填寫表單並在多選中進行選擇后才能啟用按鈕。
我對javascript,jquery等的了解非常有限。 任何幫助表示贊賞。
檢查這個,或檢查片段。 我已經更新了代碼段,可以先選擇然后鍵入,然后啟用button
反之亦然。
https://jsfiddle.net/5qomb6fe/5/
(function() { function enabledButton(){ if(empty == false && selection == false){ $('#keybutton').removeAttr('disabled'); }else{ $('#keybutton').attr('disabled', 'disabled'); } } var selection = null; var empty = null; $('form > textarea').keyup(function() { $('form > textarea').each(function() { if ($(this).val()=='') { empty = true; }else{ empty = false; } }); enabledButton(); }); $('.selection').on('change',function(){ selection = false; enabledButton(); }); })()
<style> body { padding-top: 20px; padding-left: 20px; padding-right: 20px; } th, td { padding: 1px; } </style>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script> <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css" rel="stylesheet"/> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <div class="container"> <h5>Input Words and Make Selection</h5> <br> <form method='post'> <div class="row"></div> <textarea class="form-control" id="field" name="words" rows="12"></textarea> <br> <select class="form-control selection" id="type" multiple name="type" size="13"> <option value="">Null</option> <option value="One">One</option> <option value="Two">Two</option> <option value="Three">Three</option> <option value="Four">Four</option> <option value="Five">Five</option> <option value="Six">Six</option> </select> <br> <input class="btn btn-danger" name="button" type="submit" value="Submit", id="keybutton" disabled="disabled"> </form> </div>
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