JQuery get values from html table

问题

I am attempting to pull data from a dynamic table using JQuery, but every way I've tried turns the values into something else (the below code will return an "l" instead of the N/A I was expecting. I have tried using .each and .map as the function as well as .val .html and as you can see .text to pull the data. I am stuck as to why and what I am doing wrong. Any help would be greatly appreciated.

HTML

    <table id="attendees" class="attendees">
    <thead>
        <tr style="border-bottom: double;border-color: #007fff" ;="">
            <th>Full Name</th>
            <th>Membership Type</th>
            <th>Membership Expiration Date</th>
            <th>Free Vouchers</th>
            <th>Classes From Pack Remaining</th>
            <th>Yelp Check in</th>
            <th>Payment Option</th>
            <th>Remove</th>
        </tr>
    </thead>
    <tbody>
        <tr class="data">
            <td>Students Name</td>
            <td>N/A</td>
            <td>N/A</td>
            <td>0</td>
            <td>0</td>
            <td>Yes</td>
            <td>
                <ul id="list">
                    <select id="payment" name="payment">
                        <option>Cash/Credit</option>
                        <option>Free Voucher</option>
                        <option>Yelp Check-in</option>
                    </select>
                </ul>
            </td>
            <td>
                <div><a href="#" class="remove"><p>Remove</p></a>
                </div>
            </td>
        </tr>
    </tbody>
</table>

JQuery

$("#submit").live('click', function (e) {
           $("#attendees tr.data").map(function (index, elem) {
               var x = $(this);
               var cells = x.find('td');
               var $data = cells.text();
               //alert($data[1]);
                if ($data[1] == "N/A") {
                alert(true);    
               }

          });
            e.preventDefault();

        });

Final Solution

Thanks first of all to everyone who chimed in, I honestly learned a little something from each persons answer. In the end this is what I settled on below. In hindsight I probably should of given a more thorough description on what I was attempting to accomplish. Which was to scan multiple rows of data and do something based on the info found in each row. To accomplish this I was forced to separate the tr and td .each functions. This allowed me to scan row by row and still get the individual data.
Thanks again for everyone's help especially @TechHunter

$("#submit").on('click', function (e) {
    e.preventDefault();

    $("#attendees tbody tr").each(function(i) {
    var $data= [];
    var x = $(this);
    var cells = x.find('td');
    $(cells).each(function(i) {
    var $d= $("option:selected", this).val()||$(this).text();
    $data.push($d);
    });      
        if ($data[1] == "N/A") {
           doSomething(); 
        }
    });
});

回答1:

Simplest answer would be to add a class when you need to retrieve a value :

HTML

<table id="attendees" class="attendees">
    <thead>
        <tr style="border-bottom: double;border-color: #007fff" ;="">
            <th>Full Name</th>
            <th>Membership Type</th>
            <th>Membership Expiration Date</th>
            <th>Free Vouchers</th>
            <th>Classes From Pack Remaining</th>
            <th>Yelp Check in</th>
            <th>Payment Option</th>
            <th>Remove</th>
        </tr>
    </thead>
    <tbody>
        <tr class="data">
            <td class="inputValue">Students Name</td>
            <td class="inputValue">N/A</td>
            <td class="inputValue">N/A</td>
            <td class="inputValue">0</td>
            <td class="inputValue">0</td>
            <td class="inputValue">Yes</td>
            <td>
                <ul id="list">
                    <select id="payment" class="inputValue" name="payment">
                        <option>Cash/Credit</option>
                        <option>Free Voucher</option>
                        <option>Yelp Check-in</option>
                    </select>
                </ul>
            </td>
            <td>
                <div><a href="#" class="remove"><p>Remove</p></a>
                </div>
            </td>
        </tr>
    </tbody>
</table>

Javascript

$("#submit").on('click', function (e) {
    e.preventDefault();
    var data = $("#attendees tr.data").map(function (index, elem) {
        var ret = [];
        $('.inputValue', this).each(function () {
            var d = $(this).val()||$(this).text();
            ret.push(d);
            console.log(d);
            if (d == "N/A") {
                console.log(true);
            }
        });
        return ret;
    });
    console.log(data);
    console.log(data[0]);
});

It's easier and you only retrieve value you want to retrieve. Fast to implement and to maintain.

Fiddle here

回答2:

You should use on() in place of live() (IF your JQuery version supports it) REASON . Just modified your jquery a little bit like this and it worked :

JQuery-

$("#submit").on('click', function (e) {

       $("#attendees tr.data").map(function (index, elem) {
           $(this).find('td').each(function(){
           var $data = $(this).html();
           alert($data);
            if ($data == "N/A") {
            alert(true);    
           }
        });
      });
        e.preventDefault();

    });

UPDATE:-

Just check whether there is a selectbox in the td . If it is, then you can get its as shown below :

if($(this).find("select").length > 0)
     {
         alert("found select")
         alert($(this).find("select").val())
     }

Demo here :- FIDDLE (The updated one showing the value selected in the selectbox )

回答3:

A couple things, assuming you're using a recent version of jQuery, you're going to want to replace live() with on().

Also, you need to iterate over you cells to find what you're looking for, simply placing it in a variable won't do the trick.

$(document).on('click', '#submit' function (e) {
    e.preventDefault();

    //time to iterate over the cells
    $("#attendees tr.data td").each(function(i) {
        if ($(this).text() == "N/A") {
            alert("Found it on cell index: " +i);
        }
    });
});

If you want to use .map() to return an array of the td text, you can do:

var tdArray = $("#attendees tr.data td").map(function() {
    return $(this).text();
}).get();

来源：https://stackoverflow.com/questions/16805288/jquery-get-values-from-html-table