禁用提交按钮，直到表单填写完毕JQuery / JavaScript

Question

我有一个包含3个下拉列表和一个输入字段的表单。

我希望显示“提交”按钮，直到所有字段都被填充为止，但是由于填充字段时我的“提交”按钮不会重新启用，因此我似乎无法使其正常工作。

我试图使用的代码是：

的HTML

<div class="row">
    <div class="col-sm-12">
        <div class="form-group" id="FromClass">
            <label class="col-sm-offset-3 col-sm-2 control-label">From</label>
            <div class="col-sm-6 col-md-4" id="FromDiv">
                <select name="RegCashMove_From_DropDownList" class="form-control" id="RegCashMove_From_DropDownList">
                    <option value="- - Please select - -">- - Please select - -</option>
                    <option value="AJBIC">AJBIC</option>
                    <option value="FSS">FSS</option>
                </select>
            </div>
        </div>
        <div class="form-group" id="ToClass">
            <label class="col-sm-offset-3 col-sm-2 control-label">To</label>
            <div class="col-sm-6 col-md-4" id="ToDiv">
                <select name="RegCashMove_To_DropDownList" class="form-control" id="RegCashMove_To_DropDownList">
                    <option value="- - Please select - -">- - Please select - -</option>
                    <option value="AJBIC">AJBIC</option>
                    <option value="FSS">FSS</option>
                </select>
            </div>
        </div>
        <div class="form-group" id="AmountClass">
            <label class="col-sm-offset-3 col-sm-2 control-label">Amount</label>
            <div class="col-sm-6 col-md-4" id="AmountDiv">
                <div class="input-group">
                    <div class="input-group-addon">£</div>
                    <input name="RegCashMove_Amount_TextBox" class="form-control" id="RegCashMove_Amount_TextBox" onblur="FormatCurrency(this);" type="number" step="any" value="" placeholder="0.00">
                </div>
            </div>
        </div>
        <div class="form-group" id="FrequencyClass">
            <label class="col-sm-offset-3 col-sm-2 control-label">Frequency</label>
            <div class="col-sm-6 col-sm-4" id="FrequencyDiv">
                <select name="RegCashMove_Frequency_DropDownList" class="form-control" id="RegCashMove_Frequency_DropDownList">
                    <option value="0">- - Please select - -</option>
                    <option value="1">Monthly</option>
                    <option value="3">Quarterly</option>
                    <option value="6">Half yearly</option>
                    <option value="12">Yearly</option>
                </select>
            </div>
        </div>
        <div class="form-group pull-right" id="submitAndCancel" style="display: block;">
            <div class="col-sm-12">
                <button name="RegularCashMovements_Submit_Button" disabled="disabled" class="btn btn-default" id="RegularCashMovements_Submit_Button" type="submit">
                    <span class="glyphicon glyphicon-ok"></span> Submit
                </button> 
                <button name="RegularCashMovements_Cancel_Button" class="btn btn-default" id="RegularCashMovements_Cancel_Button" type="submit">
                    <span class="glyphicon glyphicon-remove"></span> Cancel
                </button>
            </div>
        </div>
    </div>
</div>

jQuery查询

 $(document).ready(function () {    
    <% if (state == "Initial")
    { %>
        $('#RegularCashMovements_Submit_Button').attr('disabled', 'disabled');

            function updateFormEnabled()
            {
                if (verifyAdSettings())
                {
                    $('#RegularCashMovements_Submit_Button').attr('disabled', '');
                }
                else
                {
                    $('#RegularCashMovements_Submit_Button').attr('disabled', 'disabled');
                }
            }

            function verifyAdSettings()
            {
                if ($('#RegCashMove_From_DropDownList').val() != '- - Please select - -' && $('#RegCashMove_To_DropDownList').val() != '- - Please select - -' && $('#RegCashMove_Amount_TextBox').val() != '' && $('#RegCashMove_Frequency_DropDownList').val() != '0')
                {
                    return true;
                }
                else
                {
                    return false
                }
            }

            $('#RegCashMove_From_DropDownList').change(updateFormEnabled);
            $('#RegCashMove_To_DropDownList').change(updateFormEnabled);
            $('#RegCashMove_Amount_TextBox').change(updateFormEnabled);
            $('#RegCashMove_Frequency_DropDownList').change(updateFormEnabled);
    <%} %>
});

这是我的小提琴 。

Answer 1

使用removeAttr删除禁用的属性。您可能想知道， disable =“”还会禁用DOM元素。

 $(document).ready(function () { var state = "Initial"; if (state == "Initial") { function updateFormEnabled() { if (verifyAdSettings()) { $('#RegularCashMovements_Submit_Button').removeAttr('disabled'); } else { $('#RegularCashMovements_Submit_Button').attr('disabled', 'disabled'); } } function verifyAdSettings() { if ($('#RegCashMove_From_DropDownList').val() != '- - Please select - -' && $('#RegCashMove_To_DropDownList').val() != '- - Please select - -' && $('#RegCashMove_Amount_TextBox').val() != '' && $('#RegCashMove_Frequency_DropDownList').val() != '0') { return true; } else { return false } } $('#form select').change(updateFormEnabled); $('#RegCashMove_Amount_TextBox').change(updateFormEnabled); } }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div class="row" id="form"> <div class="col-sm-12"> <div id="RegCashMoveHeading"> <h3>Set up a new regular cash movement</h3> </div> <div class="form-group" id="FromClass"> <label class="col-sm-offset-3 col-sm-2 control-label">From</label> <div class="col-sm-6 col-md-4" id="FromDiv"> <select name="RegCashMove_From_DropDownList" class="form-control" id="RegCashMove_From_DropDownList"> <option value="- - Please select - -">- - Please select - -</option> <option value="AJ Bell Investcentre">AJ Bell Investcentre</option> <option value="Funds and Shares Service">Funds and Shares Service</option> </select> </div> </div> <div class="form-group" id="ToClass"> <label class="col-sm-offset-3 col-sm-2 control-label">To</label> <div class="col-sm-6 col-md-4" id="ToDiv"> <select name="RegCashMove_To_DropDownList" class="form-control" id="RegCashMove_To_DropDownList"> <option value="- - Please select - -">- - Please select - -</option> <option value="AJ Bell Investcentre">AJ Bell Investcentre</option> <option value="Funds and Shares Service">Funds and Shares Service</option> </select> </div> </div> <div class="form-group" id="AmountClass"> <label class="col-sm-offset-3 col-sm-2 control-label">Amount</label> <div class="col-sm-6 col-md-4" id="AmountDiv"> <div class="input-group"> <div class="input-group-addon">£</div> <input name="RegCashMove_Amount_TextBox" class="form-control" id="RegCashMove_Amount_TextBox" onblur="FormatCurrency(this);" type="number" step="any" value="" placeholder="0.00"> </div> </div> </div> <div class="form-group" id="FrequencyClass"> <label class="col-sm-offset-3 col-sm-2 control-label">Frequency</label> <div class="col-sm-6 col-sm-4" id="FrequencyDiv"> <select name="RegCashMove_Frequency_DropDownList" class="form-control" id="RegCashMove_Frequency_DropDownList"> <option value="0">- - Please select - -</option> <option value="1">Monthly</option> <option value="3">Quarterly</option> <option value="6">Half yearly</option> <option value="12">Yearly</option> </select> </div> </div> <div class="form-group pull-right" id="submitAndCancel" style="display: block;"> <div class="col-sm-12"> <button name="RegularCashMovements_Submit_Button" disabled="disabled" class="btn btn-default" id="RegularCashMovements_Submit_Button" type="submit"> <span class="glyphicon glyphicon-ok"></span> Submit </button> <button name="RegularCashMovements_Cancel_Button" class="btn btn-default" id="RegularCashMovements_Cancel_Button" type="submit"> <span class="glyphicon glyphicon-remove"></span> Cancel </button> </div> </div> </div> </div> 

Answer 2

只需将代码中的.attr()更改为.prop()因为使用.attr将按钮设置回Not Disabled将不起作用，有关stackoverflow的许多问题的更多信息：
-jQuery中prop（）和attr（）之间的区别以及何时使用attr（）和prop（）
-.prop（）与.attr（）
-jQuery attr vs prop？
-.prop（）与.attr（）