Jquery .val（）不会更新屏幕上的文本框

Question

一个非常奇怪的问题。我在表单上提供了一些应该自动填充某些字段（文本框）的按钮。应该插入文本框的值是要评估的javascript函数。但即使我只是尝试将纯文本放在那里，他们也不会更新。

设置这些值的按钮似乎正确设置文本框上的值，因为我有另一个评估值的按钮。但是文本框在屏幕上仍然是空的，当用F12工具查看标记时，我什么也看不见。

我提前为糟糕的格式化道歉。我只是想使用JFiddle链接来简化和甜蜜，但Stackoverflow不会让我。精氨酸。

https://jsfiddle.net/ox5cat40/

<div class="container-row">
    <div id="DateValidationPanel"></div>
    <div id="StartEndDateButtons" class="container-row">
      <button id="ScheduleTodayButton">Today</button>
      <button id="ScheduleLast24Button">Last 24 Hours</button>
      <button id="ScheduleLastWeekButton">Last Week</button>
      <button id="ScheduleCurrentMonthButton">Current Month</button>
      <button id="EvaluateButton">Verify Start &amp; End Dates</button>
    </div>
  <table id="ScheduleParametersTable">
    <thead>
    <tr>
      <th class="schedule-td-1">Parameter</th>
      <th class="schedule-td-2">Type</th>
      <th>Value</th>
    </tr>
    </thead>
      <tbody><tr>
        <td>
          <input data-val="true" data-val-number="The field Id must be a number." data-val-required="The Id field is required." id="Parameters_0__Id" name="Parameters[0].Id" type="hidden" value="0">
          <input id="Parameters_0__Name" name="Parameters[0].Name" type="hidden" value="PSTART_DATE">
          <input id="Parameters_0__DisplayText" name="Parameters[0].DisplayText" type="hidden" value="Start Date">
          <input data-val="true" data-val-number="The field ParameterId must be a number." data-val-required="The ParameterId field is required." id="Parameters_0__ParameterId" name="Parameters[0].ParameterId" type="hidden" value="422">
          <input data-val="true" data-val-number="The field DotNetTypeId must be a number." data-val-required="The DotNetTypeId field is required." id="Parameters_0__DotNetTypeId" name="Parameters[0].DotNetTypeId" type="hidden" value="3">
          <input data-val="true" data-val-number="The field CaptureTypeId must be a number." data-val-required="The CaptureTypeId field is required." id="Parameters_0__CaptureTypeId" name="Parameters[0].CaptureTypeId" type="hidden" value="3">
          <input id="Parameters_0__CaptureType" name="Parameters[0].CaptureType" type="hidden" value="">
          <input data-val="true" data-val-number="The field Ordering must be a number." data-val-required="The Ordering field is required." id="Parameters_0__Ordering" name="Parameters[0].Ordering" type="hidden" value="1">
          <input id="Parameters_0__DropDownQueryName" name="Parameters[0].DropDownQueryName" type="hidden" value="">
          <input data-val="true" data-val-number="The field DropDownQueryProjectId must be a number." id="Parameters_0__DropDownQueryProjectId" name="Parameters[0].DropDownQueryProjectId" type="hidden" value="">
          <input data-val="true" data-val-number="The field DropDownQueryParam must be a number." id="Parameters_0__DropDownQueryParam" name="Parameters[0].DropDownQueryParam" type="hidden" value="">
          <input id="Parameters_0__Value" name="Parameters[0].Value" type="hidden" value="((new Date()).getMonth()) + &quot;/&quot; + ((new Date()).getDate()) + &quot;/&quot; + (new Date()).getFullYear()">
          <input id="Parameters_0__ScheduledValue" name="Parameters[0].ScheduledValue" type="hidden" value="var d = new Date();(d.getMonth()+1) + '/1/'+d.getFullYear();">
          <input id="Parameters_0__Type" name="Parameters[0].Type" type="hidden" value="DynamicReport.Models.ReportParameter">
          <input id="Parameters_0__DropDownValue" name="Parameters[0].DropDownValue" type="hidden" value="">
          Start Date
        </td>
        <td></td>
        <td>
<input id="Parameters_0__ScheduledValue" name="Parameters[0].ScheduledValue" type="text" class="scheduled-value"/>         </td>
      </tr>
      <tr>
        <td>
          <input data-val="true" data-val-number="The field Id must be a number." data-val-required="The Id field is required." id="Parameters_1__Id" name="Parameters[1].Id" type="hidden" value="0">
          <input id="Parameters_1__Name" name="Parameters[1].Name" type="hidden" value="PEND_DATE">
          <input id="Parameters_1__DisplayText" name="Parameters[1].DisplayText" type="hidden" value="End Date">
          <input data-val="true" data-val-number="The field ParameterId must be a number." data-val-required="The ParameterId field is required." id="Parameters_1__ParameterId" name="Parameters[1].ParameterId" type="hidden" value="423">
          <input data-val="true" data-val-number="The field DotNetTypeId must be a number." data-val-required="The DotNetTypeId field is required." id="Parameters_1__DotNetTypeId" name="Parameters[1].DotNetTypeId" type="hidden" value="3">
          <input data-val="true" data-val-number="The field CaptureTypeId must be a number." data-val-required="The CaptureTypeId field is required." id="Parameters_1__CaptureTypeId" name="Parameters[1].CaptureTypeId" type="hidden" value="3">
          <input id="Parameters_1__CaptureType" name="Parameters[1].CaptureType" type="hidden" value="">
          <input data-val="true" data-val-number="The field Ordering must be a number." data-val-required="The Ordering field is required." id="Parameters_1__Ordering" name="Parameters[1].Ordering" type="hidden" value="2">
          <input id="Parameters_1__DropDownQueryName" name="Parameters[1].DropDownQueryName" type="hidden" value="">
          <input data-val="true" data-val-number="The field DropDownQueryProjectId must be a number." id="Parameters_1__DropDownQueryProjectId" name="Parameters[1].DropDownQueryProjectId" type="hidden" value="">
          <input data-val="true" data-val-number="The field DropDownQueryParam must be a number." id="Parameters_1__DropDownQueryParam" name="Parameters[1].DropDownQueryParam" type="hidden" value="">
          <input id="Parameters_1__Value" name="Parameters[1].Value" type="hidden" value="((new Date()).getMonth()+1) + &quot;/&quot; +(new Date(new Date().getFullYear(), new Date().getMonth() + 1, 0)).getDate() + &quot;/&quot; + (new Date()).getFullYear()">
          <input id="Parameters_1__ScheduledValue" name="Parameters[1].ScheduledValue" type="hidden" value="((new Date()).getMonth()+1)+'/'+(new Date(new Date().getFullYear(),new Date().getMonth()+1,0)).getDate()+'/'+(new Date()).getFullYear();">
          <input id="Parameters_1__Type" name="Parameters[1].Type" type="hidden" value="DynamicReport.Models.ReportParameter">
          <input id="Parameters_1__DropDownValue" name="Parameters[1].DropDownValue" type="hidden" value="">
          End Date
        </td>
        <td></td>
        <td>
<input id="Parameters_1__ScheduledValue" name="Parameters[1].ScheduledValue" type="text" class="scheduled-value"/>     </td>
      </tr>
  </tbody></table>
</div> 

      var today = "var d = new Date();(d.getMonth()+1) + '/' + d.getDate() + '/'+d.getFullYear();";
  var yesterday = "var d = new Date();d.setDate(d.getDate()-1);(d.getMonth()+1) + '/' + d.getDate() + '/'+d.getFullYear();";
  var sevenDaysAgo = "var d = new Date();d.setDate(d.getDate()-7);(d.getMonth()+1) + '/' + d.getDate() + '/'+d.getFullYear();";
  var firstOfCurrentMonth = "var d = new Date();(d.getMonth()+1) + '/1/'+d.getFullYear();";
  var lastOfCurrentMonth = "((new Date()).getMonth()+1)+'/'+(new Date(new Date().getFullYear(),new Date().getMonth()+1,0)).getDate()+'/'+(new Date()).getFullYear();";

 function evalDate(dateType, input) {
    var result;
    try {
      var dateResult = eval(input);
      result = "<span class='date-valid'>" + dateType + ": " + dateResult + "</span><br/>";
    } catch (ex) {
      result = "<span class='date-error'>" + dateType + ": Syntax Error</span><br/>";
    }

    return result;
  }

   $("#EvaluateButton").click(function (e) {
      e.preventDefault();

      var result;

      $("#DateValidationPanel").html("");
      $("input[name$='DisplayText']").each(function () {

        if ($(this).val().toLowerCase().indexOf("start") >= 0) {
          index = $("input[name$='DisplayText']").index($(this));

          result = evalDate("Start Date", $("input[name$='ScheduledValue']").eq(index).val());
          $("#DateValidationPanel").append(result);
        }

        if ($(this).val().toLowerCase().indexOf("end") >= 0) {
          index = $("input[name$='DisplayText']").index($(this));

          result = evalDate("End Date", $("input[name$='ScheduledValue']").eq(index).val());
          $("#DateValidationPanel").append(result);
        }
      });

      return false;
    });

    $("#ScheduleTodayButton").click(function (e) {
      e.preventDefault();
      $("input[name$='DisplayText']").each(function () {

        // Set Start Date
        if ($(this).val().toLowerCase().indexOf("start") >= 0) {
          index = $("input[name$='DisplayText']").index($(this));
          $("input[name$='ScheduledValue']").eq(index).val(today);
        }

        // Set End Date
        if ($(this).val().toLowerCase().indexOf("end") >= 0) {
          index = $("input[name$='DisplayText']").index($(this));
          $("input[name$='ScheduledValue']").eq(index).val(today);
        }
      });

      return false;
    });

    $("#ScheduleLast24Button").click(function (e) {
      e.preventDefault();
      $("input[name$='DisplayText']").each(function () {
        // Set Start Date
        if ($(this).val().toLowerCase().indexOf("start") >= 0) {
          index = $("input[name$='DisplayText']").index($(this));
          $("input[name$='ScheduledValue']").eq(index).val(yesterday);
        }

        // Set End Date
        if ($(this).val().toLowerCase().indexOf("end") >= 0) {
          index = $("input[name$='DisplayText']").index($(this));
          $("input[name$='ScheduledValue']").eq(index).val(today);
        }
      });

      return false;
    });

    $("#ScheduleLastWeekButton").click(function (e) {
      e.preventDefault();
      $("input[name$='DisplayText']").each(function () {

        // Set Start Date
        if ($(this).val().toLowerCase().indexOf("start") >= 0) {
          index = $("input[name$='DisplayText']").index($(this));
          $("input[name$='ScheduledValue']").eq(index).val(sevenDaysAgo);
        }

        // Set End Date
        if ($(this).val().toLowerCase().indexOf("end") >= 0) {
          index = $("input[name$='DisplayText']").index($(this));
          $("input[name$='ScheduledValue']").eq(index).val(today);
        }
      });
       return false;
    });


    $("#ScheduleCurrentMonthButton").click(function (e) {
        e.preventDefault();
        $("input[name$='DisplayText']").each(function () {

        // Set Start Date
        if ($(this).val().toLowerCase().indexOf("start") >= 0) {
          index = $("input[name$='DisplayText']").index($(this));
          $("input[name$='ScheduledValue']").eq(index).val(firstOfCurrentMonth);
        }

        // Set End Date
        if ($(this).val().toLowerCase().indexOf("end") >= 0) {
          index = $("input[name$='DisplayText']").index($(this));
          $("input[name$='ScheduledValue']").eq(index).val(lastOfCurrentMonth);
        }
      });

      return false;
    });

这里发生了什么？