3 files changed, 100 insertions, 16 deletions

diff --git a/ui/app/components/pending-tx/confirm-send-ether.js b/ui/app/components/pending-tx/confirm-send-ether.js
index 2474516d4..d007e6661 100644
--- a/ui/app/components/pending-tx/confirm-send-ether.js
+++ b/ui/app/components/pending-tx/confirm-send-ether.js
@@ -109,16 +109,50 @@ function ConfirmSendEther () {
   this.onSubmit = this.onSubmit.bind(this)
 }
 
-ConfirmSendEther.prototype.componentWillMount = function () {
-  const { updateSendErrors } = this.props
+ConfirmSendEther.prototype.updateComponentSendErrors = function (prevProps) {
+  const {
+    balance: oldBalance,
+    conversionRate: oldConversionRate,
+  } = prevProps
+  const {
+    updateSendErrors,
+    balance,
+    conversionRate,
+    send: {
+      errors: {
+        simulationFails,
+      },
+    },
+  } = this.props
   const txMeta = this.gatherTxMeta()
-  const balanceIsSufficient = this.isBalanceSufficient(txMeta)
 
-  updateSendErrors({
-    insufficientFunds: balanceIsSufficient
-      ? false
-      : this.context.t('insufficientFunds'),
-  })
+  const shouldUpdateBalanceSendErrors = balance && [
+    balance !== oldBalance,
+    conversionRate !== oldConversionRate,
+  ].some(x => Boolean(x))
+
+  if (shouldUpdateBalanceSendErrors) {
+    const balanceIsSufficient = this.isBalanceSufficient(txMeta)
+    updateSendErrors({
+      insufficientFunds: balanceIsSufficient ? false : this.context.t('insufficientFunds'),
+    })
+  }
+
+  const shouldUpdateSimulationSendError = Boolean(txMeta.simulationFails) !== Boolean(simulationFails)
+
+  if (shouldUpdateSimulationSendError) {
+    updateSendErrors({
+      simulationFails: !txMeta.simulationFails ? false : this.context.t('transactionError'),
+    })
+  }
+}
+
+ConfirmSendEther.prototype.componentWillMount = function () {
+  this.updateComponentSendErrors({})
+}
+
+ConfirmSendEther.prototype.componentDidUpdate = function (prevProps) {
+  this.updateComponentSendErrors(prevProps)
 }
 
 ConfirmSendEther.prototype.getAmount = function () {
@@ -457,8 +491,10 @@ ConfirmSendEther.prototype.render = function () {
       ]),
 
       h('form#pending-tx-form', {
+        className: 'confirm-screen-form',
         onSubmit: this.onSubmit,
       }, [
+        this.renderErrorMessage('simulationFails'),
         h('.page-container__footer', [
           // Cancel Button
           h('button.btn-cancel.page-container__footer-button.allcaps', {
diff --git a/ui/app/components/pending-tx/confirm-send-token.js b/ui/app/components/pending-tx/confirm-send-token.js
index dd9fdc23f..19e591fd6 100644
--- a/ui/app/components/pending-tx/confirm-send-token.js
+++ b/ui/app/components/pending-tx/confirm-send-token.js
@@ -147,21 +147,56 @@ function ConfirmSendToken () {
   this.onSubmit = this.onSubmit.bind(this)
 }
 
-ConfirmSendToken.prototype.componentWillMount = function () {
-  const { tokenContract, selectedAddress, updateSendErrors} = this.props
+ConfirmSendToken.prototype.updateComponentSendErrors = function (prevProps) {
+  const {
+    balance: oldBalance,
+    conversionRate: oldConversionRate,
+  } = prevProps
+  const {
+    updateSendErrors,
+    balance,
+    conversionRate,
+    send: {
+      errors: {
+        simulationFails,
+      },
+    },
+  } = this.props
   const txMeta = this.gatherTxMeta()
-  const balanceIsSufficient = this.isBalanceSufficient(txMeta)
+
+  const shouldUpdateBalanceSendErrors = balance && [
+    balance !== oldBalance,
+    conversionRate !== oldConversionRate,
+  ].some(x => Boolean(x))
+
+  if (shouldUpdateBalanceSendErrors) {
+    const balanceIsSufficient = this.isBalanceSufficient(txMeta)
+    updateSendErrors({
+      insufficientFunds: balanceIsSufficient ? false : this.context.t('insufficientFunds'),
+    })
+  }
+
+  const shouldUpdateSimulationSendError = Boolean(txMeta.simulationFails) !== Boolean(simulationFails)
+
+  if (shouldUpdateSimulationSendError) {
+    updateSendErrors({
+      simulationFails: !txMeta.simulationFails ? false : this.context.t('transactionError'),
+    })
+  }
+}
+
+ConfirmSendToken.prototype.componentWillMount = function () {
+  const { tokenContract, selectedAddress } = this.props
   tokenContract && tokenContract
     .balanceOf(selectedAddress)
     .then(usersToken => {
     })
   this.props.updateTokenExchangeRate()
+  this.updateComponentSendErrors({})
+}
 
-  updateSendErrors({
-    insufficientFunds: balanceIsSufficient
-      ? false
-      : this.context.t('insufficientFunds'),
-  })
+ConfirmSendToken.prototype.componentDidUpdate = function (prevProps) {
+  this.updateComponentSendErrors(prevProps)
 }
 
 ConfirmSendToken.prototype.getAmount = function () {
@@ -467,8 +502,10 @@ ConfirmSendToken.prototype.render = function () {
         ]),
 
         h('form#pending-tx-form', {
+          className: 'confirm-screen-form',
           onSubmit: this.onSubmit,
         }, [
+          this.renderErrorMessage('simulationFails'),
           h('.page-container__footer', [
             // Cancel Button
             h('button.btn-cancel.page-container__footer-button.allcaps', {
diff --git a/ui/app/css/itcss/components/confirm.scss b/ui/app/css/itcss/components/confirm.scss
index 85ff14e6e..47762e8de 100644
--- a/ui/app/css/itcss/components/confirm.scss
+++ b/ui/app/css/itcss/components/confirm.scss
@@ -312,6 +312,17 @@ section .confirm-screen-account-number,
   }
 }
 
+.confirm-screen-form {
+  position: relative;
+
+  .confirm-screen-error {
+    right: 0;
+    width: 100%;
+    margin-top: 7px;
+    text-align: center;
+  }
+}
+
 .confirm-screen-confirm-button {
   height: 50px;
   border-radius: 4px;