Flask Ajax请求后不要重新加载网页 [英] Don't reload webpage after flask ajax request

问题描述

我有这个ajax请求

$(function() {
    $('#left').bind('click', function() {
        var form = $('form#data')[0]; // 
        var formData = new FormData(form);

        $.ajax({
            url: "{{ url_for('encode') }}",
            type: 'POST',
            data: formData,
            async: false,
            success: function (data) {
                $("#img-2").attr("src", "{{url_for('static', filename='encoded.png')}}");
                $("#diff").show();
            },
            cache: false,
            contentType: false,
            processData: false
            });

        });
});

当单击按钮时，此烧瓶功能运行.

And this flask function runs when the button is clicked.

@app.route('/encode', methods=['GET', 'POST'])
def encode():
    a = request.form['text']
    img = request.files['files']
    img.save("./static/original.png")
    secret = lsb.hide(img, a)
    secret.save("./static/encoded.png")
    return "ok"

我遇到的问题是该网页转了一秒钟，因为它应该设置图像并显示diff按钮.但是之后，该网页将重新加载并重置为索引页.而且我真的不知道如何防止这种情况的发生.我在做什么错了?

The problem I am having is that the webpage becomes for a split second as it should be the image is set and the button diff is shown. But after that the webpage reloads and resets to the index page. And I do not really know how to prevent that from happening. What am I doing wrong?

推荐答案

盲目猜测:您的button可能是表单的一部分，因此单击时的默认行为是提交表单并重新加载页面.您可以使用event.preventDefault()来防止这种情况:

Blind guess : your button may be part of a form, so its default behaviour when clicked is to submit the form and reload the page. You can prevent that by using event.preventDefault() :

$('#left').bind('click', function(event) {
    event.preventDefault()
    ......

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