Display a link in javascript if var is not empty. checking var endefined not working
本问题已经有最佳答案,请猛点这里访问。
只有当var不为空时,我才需要在sweetalk html中显示链接。代码如下:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | $('.patient-details').click(function(e) { e.preventDefault(); var $this = $(this) var name = $this.data('name'); var gender = $this.data('gender'); var age = $this.data('age'); var country = $this.data('country'); var address = $this.data('address'); var report = $this.data('report'); swal({ title: name, html: "Gender:" + gender +"" + "Age:" + age +"" + "Country:" + country +"" + "Address:" + address +"" + (report!=undefined?'View Report':''), }); }); |
我只需要在var报告不为空时显示报告链接。这是密码笔:https://codepen.io/pamela123/pen/gojzgo网站
我试过
1 2 3 | if(report){ report = $this.data('report'); } |
报告"未定义"。报告!=未定义不起作用。
但是如果报告为空,如何不在HTML中显示报告链接??
我知道这是一个简单的javascript问题,但是作为一个新手,我不能再进一步了。
将数据放入单独的变量中。
然后检查
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | $('.patient-details').click(function(e) { e.preventDefault(); var $this = $(this) var name = $this.data('name'); var gender = $this.data('gender'); var age = $this.data('age'); var country = $this.data('country'); var address = $this.data('address'); var report = $this.data('report'); var htmlData ="Gender:" + gender +"" + "Age:" + age +"" + "Country:" + country +"" + "Address:" + address +""; if( report !== undefined && report !="" ) { htmlData += 'View Report' } swal({ title: name, html: htmlData }); }); |
您可以如下更新您的代码
1 2 3 4 5 6 7 8 | var htmlTemplate="Gender:" + gender +"" +"Age:" + age +"" +"Country:" + country +"" +"Address:" + address +"" ; if(report){ htmlTemplate+= 'View Report'; } swal({ title: name, html: htmlTemplate, }); |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | $('.patient-details').click(function(e) { e.preventDefault(); var $this = $(this) var name = $this.data('name'); var gender = $this.data('gender'); var age = $this.data('age'); var country = $this.data('country'); var address = $this.data('address'); var report = $this.data('report'); swal({ title: name, html: "Gender:" + gender +"" + "Age:" + age +"" + "Country:" + country +"" + "Address:" + address +"" +(typeof report !=="undefined" && report !=""?'View Report':'') , }); }); |