使用文本框内的jQuery填充下拉列表 [英] Populate Drop Down List using jquery from textbox

问题描述

我有一个ID为其他的文本框，我想将此文本框值填充到下拉列表中 这是我用来填充的javascript...但是这是行不通的.任何建议将不胜感激……！我想这样做: http://viralpatel.net/blogs/demo/dynamic -combobox-listbox-dropdown-in-javascript.html

I have a textbox whose id is other and I want to populate this textbox value into drop down list This is javascript I am using to populate... but this is not working.. Any suggestion will be appreciated...!! I want to do like this:- http://viralpatel.net/blogs/demo/dynamic-combobox-listbox-dropdown-in-javascript.html

<SCRIPT language="javascript"> 
function addCombo() {
    var textb = $('#other').attr('id');
    var combo = $('#category').attr('id');
    alert(combo);

    var option = document.createElement("option");
    option.text = $('#other').val();
    alert(option.text);
    option.value = $('#other').val();
    try {
        combo.add(option, null); //Standard 
    }catch(error) {
        combo.add(option); // IE only
    }
    textb.value = "";
}
</SCRIPT>

---

这是下拉列表的代码

---

This is the code of drop down list

<td>Category</td>
                    <td><select class="size" id="category" name="category" width="30px">
                    <option width="30px" value="" selected="selected" >Select</option>
                    <option value="food">Food</option>
                        <option value="rent">Rent</option>
                        <option value="gas">Gas</option>
                        <option value="enter">Entertainment</option>
                        <option value="grocery">Grocery</option>
                        <option value="general">General</option>
                        <option value="other">Other</option></select></td>
                        </tr>
                        <tr>
                        <td>Other</td>
                        <td><input type="text" id="other" name="other"/></td>
                        <td><input type="button" data-role="button" value="Add" onclick="addCombo()"></td>
                        </tr>

推荐答案

我相信是因为

var textb = $('#other').attr('id');
var combo = $('#category').attr('id');

不是将这些元素的ID分配给变量而不是元素吗?
我的意思是……执行此代码后，textb真的是输入元素，还是只是字符串"other"?

Aren't you assigning id's of these elements to variables, instead of elements?
I mean... is textb really a input element after this code executes, or is it just a string "other"?

尝试一下:

var textb = $('#other');
var combo = $('#category');

function addCombo() {
    var textb = document.getElementById("other");
    var combo = document.getElementById("category");

    var option = document.createElement("option");
    option.text = textb.value;
    option.value = textb.value;
    try {
        combo.add(option, null); //Standard 
    }catch(error) {
        combo.add(option); // IE only
    }
    textb.value = "";
}

这篇关于使用文本框内的jQuery填充下拉列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！