前端点击搜索，不传递前端输入的条件数据，怎么解决？

前端点击搜索按钮，不传递前端输入的条件数据
问题相关代码

Controller层

@RequestMapping("/view")
    public String view(KokyakuForm form, RedirectAttributes ra, Model model) {
                return "/kokyakuSearch";
    }

    @RequestMapping("/kokyakuSearch")
    public String kokyakuList(KokyakuForm form, RedirectAttributes ra,HttpServletRequest request) {
         List<MKokyakuTbl> list = kokyakuSearchService.searchKokyakuForm(form.getKokyakuCdFrom(),form.getKokyakuCdTo(),form.getKokyakuNm());
        int count = list.size();
        ra.addFlashAttribute("size",count);
        ra.addFlashAttribute("kokyaku",list);
        System.out.println(list);
        return "redirect:/view";
    }

前端

<body onload="hideHistory('0')">
<form method="post" th:action="@{/kokyakuSearch}" th:object="${kokyakuForm}">
<span class="fontTitle">顧客検索</span>
<hr class="hrPopup1">
<div id="err" class="fontError">該当するデータがありません。</div>
<hr class="hrPopup1">

<fieldset class="windowWidth1x1">
    <legend>検索条件</legend>
    <table>
        <tr>
            <td><div class="item1 itemWidth0">顧客名</div></td>
            <td colspan="2"><input type="text" class="input1 inputWidth2"  th:value="*{kokyakuNm}" th:field="*{kokyakuNm}"></td>
        </tr>
        <tr>
            <td><div class="item1 itemWidth0">顧客コード</div></td>
            <td>
                <input type="text" class="input1 inputWidth000" name="kokyakuCdFrom" th:value="*{kokyakuCdFrom}" th:field="*{kokyakuCdFrom}">
                &nbsp;～&nbsp;
                <input type="text" class="input1 inputWidth000" name="kokyakuCdTo" th:value="*{kokyakuCdTo}" th:field="*{kokyakuCdTo}">
            </td>
            
            <td><button class="button btnWidth2" onclick="showHistory('1')">検索(<span class="accessLetter">S</span>)</button></td>
        </tr>
    </table>
</fieldset>
<br>
<div id="result">
<fieldset class="windowWidth1x1" style="height:522px;">
    <legend>検索結果</legend>
    <div class="popupShowCnt">検索件数 <a id="size" th:text=${size}></a> 件</div>
    <table class="listViewTable">
        <tr>
            <th class="item2" style="width:90px;"><u>顧客コード</u></th>
            <th class="item2" style="width:517px;"><u>顧客名</u></th>
        </tr>
    </table>
    <div class="scrollOnY" style="height:462px;">
        <table class="listViewTable windowWidth1">
            <tr th:each="list : ${kokyaku}">
                <td style="width:90px;" nowrap th:text="${list.kokyakuCd}"></td>
                <td style="width:490px;" nowrap th:text="${list.kokyakuNm}"></td>
            </tr>
        </table>
    </div>
</fieldset>
</div>
<br>
<div class="windowWidth1x1 alignRight">
    <button class="button btnWidth2" onclick="window.close();">閉じる (<span class=accessLetter>E</span>)</button>
</div>
</form>
</body>

img

不报错，但是不传递数据，sql无法执行
跟静态画面没关系，RedirectAttributes可以读取一次数据。

showHistory('1')方法怎么写的