通过点击加号按钮添加一个下拉输入框 [英] Adding a dropdown input box by clicking a plus button
问题描述
我试图通过点击加号按钮,在它的变量数来定义的最大增加新的盒子添加在它predefined值的框。
母语:其中; BR>
<选择名称=nativelangID =nativelangdrop>
< PHP
如果($文件= @fopen('TXT / languages.txt','R')){
而(($行=与fgets($文件))!== FALSE){
回声<选项> {$行}< /选项>中;
}
FCLOSE($文件);
}
?>
< /选择>
我有这在我的HTML文件,我想,如果用户选择的语言,用户有oportunity点击一个加号按钮/链接来增加一个相同的盒子。我也想可添加选择的数量限制,如果需要,我可以改变一个变量的数量。
我在这里发现了一些类似的例子,但我不知道任何jQuery和我不知道如何调用这个过程,所以我希望你们能帮助我。
还挺喜欢这个伪code:
on.click - > add.item(选择);
如果item.number =或GT; 5 - > add.item = FALSE;
在此先感谢!
您需要克隆现有的选择
然后追加那些容器,保持一个计数。您可以使用选项的数量在原来的选择
来限制新的数量。此外,重要的是你必须确保你给一个独特的 ID
每一个新的选择
创建
在此行的内容:
VAR总;\r
\r
//要自动限制基于选项的数目\r
//总= $(#nativelangdrop),发现(选项),长度为 - 1。\r
\r
//硬code极限\r
总= 5;\r
\r
\r
$(#addBtn)。在(点击,函数(){\r
VAR CTR = $(#额外的)发现的长度。(额外)。\r
如果(CTR<累计){\r
。变量$ DDL = $(#nativelangdrop)的clone();\r
$ ddl.attr(ID,DDL+ CTR);\r
$ ddl.addClass(额外);\r
$(#额外的)追加($ DDL);\r
}\r
});
\r
&LT;脚本SRC =https://ajax.googleapis.com/ajax /libs/jquery/2.1.1/jquery.min.js\"></script>\r
&LT;选择ID =nativelangdrop&GT;\r
&LT;期权价值=1&GT;语言1 LT; /选项&GT;\r
&LT;期权价值=2&GT;语言2'; /选项&GT;\r
&LT;期权价值=3&GT;语言第3版; /选项&GT;\r
&LT;期权价值=4&GT;语言4℃; /选项&GT;\r
&LT; /选择&GT;\r
&LT;跨度ID =额外的&GT;&LT; / SPAN&GT;\r
&LT;小时/&GT;\r
&LT;输入ID =addBtn类型=按钮值=+/&GT;
\r
i am trying to add a box with predefined values in it by clicking a plus button with a variable number in it to define the max addition of new boxes.
Native language:<br>
<select name="nativelang" id="nativelangdrop">
<?php
if ($file = @fopen('txt/languages.txt', 'r')) {
while(($line = fgets($file)) !== false) {
echo "<option>{$line}</option>";
}
fclose($file);
}
?>
</select>
i have this in my html file and i want, if a user selects a language, that the user has the oportunity to click a "plus button/ link" to add one more of the same box. I also want to limit the amount of addable selects to a variable number that i can change if needed.
i have found some similar examples here but i dont know any jquery and am not sure how to call this process, so i hope you guys can help me out.
kinda like this in pseudo code:
on.click -> add.item(select);
if item.number = or > 5 -> add.item = false;
Thanks in advance!
You need to clone the existing select
and then append those to a container, keeping a count. You can use the number of options in the original select
to restrict the number of new ones. Also, importantly you have to make sure that you give a unique id
to each new select
you create.
Something on the lines of this:
var total;
// To auto limit based on the number of options
// total = $("#nativelangdrop").find("option").length - 1;
// Hard code a limit
total = 5;
$("#addBtn").on("click", function() {
var ctr = $("#additional").find(".extra").length;
if (ctr < total) {
var $ddl = $("#nativelangdrop").clone();
$ddl.attr("id", "ddl" + ctr);
$ddl.addClass("extra");
$("#additional").append($ddl);
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id="nativelangdrop">
<option value="1">Language 1</option>
<option value="2">Language 2</option>
<option value="3">Language 3</option>
<option value="4">Language 4</option>
</select>
<span id="additional"></span>
<hr />
<input id="addBtn" type="button" value=" + " />
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