如何使用jquery验证和signature_pad输入签名，如何添加检查？ [英] How can I add a check if a signature is entered using jquery validation and signature_pad?

问题描述

我正在使用 jquery.validate.js 来验证表单中的多个字段以及 smizek的signature_pad 。我想验证是否在同时验证所有其他输入字段的同时在html画布（签名板上）上绘制了一些东西。

I'm using jquery.validate.js to validate multiple fields in my form along with smizek's signature_pad. I want to validate if something is drawn on the html canvas (signature pad) at the same time all the other input fields are validated.

不幸的是，在jQuery验证Submithandler来检查画布是否具有签名是不够的，因为这仅在满足所有其他必需字段时才触发。我可以将方法添加到jquery验证程序中，但是我很确定这些方法仅可用于验证输入的内容，而不是画布。

Unfortunately, adding a function to the jquery validation submithandler to check if the canvas has a signature is not sufficient because this only triggers once all other required fields are satisfied. I can add methods to jquery validator, but I'm pretty sure those only work on validating the content of inputs—not a canvas.

我可以检查签名是否存在与 signaturePad.isEmpty（）。理想情况下，将有一种添加与任何验证同时发生的函数的方法：

I can check if the signature exists with "signaturePad.isEmpty()". Ideally, there would be a way to add a function like this that happens concurrently with any validation:

    var errorExists = false;
    if( signaturePad.isEmpty()){
      if (errorExists == false){
        $( "#signature-pad" ).append( "<div id="sig-error">A signature is required</div>" );
        errorExists = true;
      }
    }else if( !signaturePad.isEmpty()) {
      if (errorExists == true){
        $('#sig-error').remove();
      }
    }

...并且仅继续提交

...and only continue on to actually submit the form if both the jquery validation and the signature are satisfied.

是否有办法在其他验证发生的同时（而不是之后）触发函数触发器？除非同时满足我的两个条件，否则如何停止提交表单-不只是jquery验证？

Is there a way to have a function trigger at the same time other validation happens—not after? How can I stop the form from submitting unless both my conditions are met—not just the jquery validation?

推荐答案

在jquery验证中submithandler，如果未填写签名，则返回false ：

In the jquery validation submithandler, return false if the signature is not filled:

    if( signaturePad.isEmpty()){
            console.log('it is empty');
            return false;            
        }

这可以防止在没有签名的情况下提交表单。

This prevents the form from being submit if there is no signature.

要像其他jquery验证错误消息一样显示缺少签名的错误消息，请将函数绑定到提交输入的单击上：

To show an error message for a missing signature like the rest of the jquery validation error messages, bind a function to the submit input's click:

    $('#submit_form').click(function(){
      if( signaturePad.isEmpty()){
        if (errorExists === false){
          $( "#signature-pad" ).append( "<div class='error' id='sig-error'>A signature is required</div>" );
          errorExists = true;
        }
      }else if( !signaturePad.isEmpty()) {
        if (errorExists === true){
          $('#sig-error').remove();
          errorExists = false;
        }
      }
    });

在某处声明变量：
var errorExists = false;

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